varistor application note

APPLICATION NOTE 2/2 poor medium-power dissipation performance of the Varistor. 4.2 Classified by Application Materials The varistor's symmetrical, sharp breakdown characteristics enable it to provide excellent transient suppression performance. DC Application Varistor Design uide www.littelfuse.com 7 Terminology Used in Varistor Specifications Terms and Descriptions Symbol Clamping Voltage. Metal Oxide Varistors (MOVs) are commonly used to suppress transients in many applications such as: Surge Protection Devices (SPD), Uninterruptible Power Supplies (UPS), AC Power Taps, AC Power Meters or other products. 10.12 B shows the result of the applied test pulse on the DUT and when the DUT is removed. Metal Oxide Varistor B72225M ***M*** ThermoFuse Varistor MT25*** PPD VAR PD 2020-01-21 Please read Cautions and warnings and Page 2 of 12 Important notes at the end of this document. It is depicted as a variable resistor which is dependent on voltage, U. Varistor symbolIEC standard. A varistor is a voltage variable resistor that: • At low voltages has an extremely high resistance • At high voltages has a very low resistance MLVs are made using multiple, fine grain ceramic layers of a specific formulation. Fig. 5}�Y�u�+b�����A���ws�*/*@���H�Ԏ��4�l;��pVTX��h`�W�w�XT�"���,�4�G��b�Y�c���9���$v_�e��{ \��J�c*Bc~��q"�8҃�-���?t�� e�E� endstream endobj 108 0 obj 2659 endobj 109 0 obj << /Filter /FlateDecode /Length 108 0 R >> stream j�ĒTLiF=�eaQ�=�Cx�!�" ���G�}�h���awZ�յ�e�d��CvŶ%J+4X�H�y/+?��N�'�=�J��.��ńE�am:Q�� APPLICATION NOTE The Protection of USB 2.0 Applications ANP002C BY JOCHEN BAIER 1. The AUMOV Series Varistor is well suited for circuit protection in a variety of automotive electronics applications, including electronic modules designed for safety systems, body electronics, powertrain systems, heating/ventilation/air-conditioning control, navigation, center console, and infotainment systems. 175 0 obj Solution Guide New "TDMA Noise Countermeasures, Reception Sensitivity Improvement, and ESD (Electrostatic Discharge) Countermeasures in Microphone Lines, Using Noise Suppression … Important notes at the end of this document. The advantages are . !�aquqٴ��,�o����a���p�B4rX�k(N�$�M����a9�� »Application Note "Chip Varistors that Excel in Resisting Repeated Surges" » Application Note "Comparison between chip varistors and MLCCs as ESD protection" » Application Note (PDF) - Solution Guides » Solution Guide "TDMA Noise Countermeasures, Reception Sensitivity Improvement, and ESD (Electrostatic Discharge) Countermeasures in Microphone Lines, Eaton Application Note “Chip Varistors that Excel in Resisting Repeated Surges” Figure 6: Effects on varistor voltage due to repeated applications of surges Figure 7: Range of multilayer chip varistors suitable for countermeasures against counter electromotive force (solenoid valves, motors, etc.) MMOVcomponents. endobj Moulson (Wiley) Online qE�C��zS�e����%͒Ğp�����0q�"�fU�&`B+ƃ�p$V�M9 |�*���;Z׈�$��0�5U��~��v�2!����0���51�"ׄ I���51D� ���^��]�ӎ!pM��.���7`aA�.��U��6b�R�p�X0����+e���فsQW�O��c���#�3dW�V�|h��f8�R����y���JÎ���ŰN�t�k"�M+�p� for Inrush Current Limiting . eaton:product-taxonomy/electronics/circuit-protection/overvoltage-protection/mlva-r-overvoltage-esd-protection Applications Surge protection device Inverters Street lighting Telecommunication Household application Feature ���{�BL;B����B��"�Tr�)۞r~w�r�ҝ�!���|'jlN <> MOV Voltage and Connection Whether single-, split-, or three-phase service, the operating voltage with suitable tolerance for high line operation is first in the selection process. The diagram at right shows a transient which is the result of stored energy within the alternator of an automobile charging system. Littelfuse produces four families of multilayer suppressor, including the ML, MLE, MLN and AUML. endobj For protection from a relatively large surge current (100A to 25kA), leaded disk varistors and SMD disk varistors are suitable. Applications Surge protection device AC/DC distribution Inverters UPS(Uninterruptable Power Supply) Telecommunication Household application The performance of the Transil on the other hand Also known as a voltage-dependent resistor (VDR), it has a nonlinear, non- ohmic current–voltage characteristic that is similar to that of a diode. <>>>/Metadata 258 0 R/Outlines 110 0 R/Pages 115 0 R/Type/Catalog/ViewerPreferences<>>> n�\ܰBpݱ�w�� �%�A����u³Dn-���݌!�+t(��6���&���v�"���^^S�E�OlU�G:*�j�iK��/FG�1.���#l~@�-I ���U7�@��9׉�I�o9]�Gt�\'ݜ6gfd:a*a�����z���P�����Ø�&��v�+b�1�v�D����� f��a�~%K�AȌ��Q1n.P��0Ӫ4��n��P�P�,�sY�):ѭ�e��:��\*�25pB?Sw���� 0sh�@Iݞ�9rn`}�0��tlވ�J�a�a˰�`.c��hmX8G���m��^�kX�V�� false �lY;]|�Cq�aZ�Z>�����;H�r LED Driver Surge Protection & … Varistors, also called metal-oxide varistors (MOVs), are used to protect sensitive circuits from a variety of overvoltage conditions. Determining the nonlinearity exponent α Two pairs of voltage/current values (V1/I1 and V2/I2) are read from the V/I characteristic of the varistor and inserted into equation 3, solved for α: (equ. endobj Protection components are used as an electrostatic countermeasure in equipment. endobj ����e+Fຍ~Y�H��Ā��>bi"� 2. Multilayer varistors application notes 4.1 Classified by Layout. Component values selected must be appropriate for the specific AC line voltage service and application. 100 0 obj << /Linearized 1 /O 102 /H [ 1578 517 ] /L 365425 /E 161087 /N 8 /T 363306 >> endobj xref 100 57 0000000016 00000 n 0000001490 00000 n 0000002095 00000 n 0000002327 00000 n 0000002642 00000 n 0000003433 00000 n 0000003665 00000 n 0000003688 00000 n 0000006815 00000 n 0000006838 00000 n 0000009577 00000 n 0000009600 00000 n 0000012966 00000 n 0000013162 00000 n 0000035320 00000 n 0000035436 00000 n 0000035661 00000 n 0000035880 00000 n 0000036663 00000 n 0000037535 00000 n 0000037745 00000 n 0000038181 00000 n 0000038204 00000 n 0000040915 00000 n 0000041145 00000 n 0000041840 00000 n 0000042627 00000 n 0000042847 00000 n 0000043635 00000 n 0000043861 00000 n 0000043884 00000 n 0000046609 00000 n 0000047402 00000 n 0000047634 00000 n 0000047657 00000 n 0000050207 00000 n 0000050230 00000 n 0000053214 00000 n 0000053237 00000 n 0000056270 00000 n 0000056408 00000 n 0000072676 00000 n 0000072815 00000 n 0000088966 00000 n 0000102985 00000 n 0000118005 00000 n 0000131297 00000 n 0000144638 00000 n 0000160128 00000 n 0000160268 00000 n 0000160394 00000 n 0000160503 00000 n 0000160612 00000 n 0000160715 00000 n 0000160818 00000 n 0000001578 00000 n 0000002073 00000 n trailer << /Size 157 /Info 88 0 R /Root 101 0 R /Prev 363295 /ID[<3de3fc45e242a99689a6c3433fa87f36><3de3fc45e242a99689a6c3433fa87f36>] >> startxref 0 %%EOF 101 0 obj << /Type /Catalog /Pages 89 0 R /JT 99 0 R /PageLabels 87 0 R >> endobj 155 0 obj << /S 310 /T 453 /L 504 /Filter /FlateDecode /Length 156 0 R >> stream The radial leaded disc type is the most common version. Y�3��6�|2�-��&�7��{k�9v#X��'��'q��⛤��E��/�y(q���%쭄l�����>ǥ���f Also known as a voltage-dependent resistor (VDR), it has a nonlinear, non-ohmic current–voltage characteristic that is similar to that of a diode.In contrast to a diode however, it has the same characteristic for both directions of traversing current. If high line conditions will allow a rise to 130VAC, then 184V peak would be applied. Eaton A Transil has to be selected in two steps: • Check that the circuit operating conditions do not exceed the specified limit of the component. �D��y�An/W=Ľ {���x3���('?�xc�����PiWm�N�zS����s3 � 4:Varistor and Transil™ diode EOS electrical behaviors. »Application Note "Chip Varistors that Excel in Resisting Repeated Surges" » Application Note "Comparison between chip varistors and MLCCs as ESD protection" » Application Note (PDF) - Solution Guides » Solution Guide "TDMA Noise Countermeasures, Reception Sensitivity Improvement, and ESD (Electrostatic Discharge) Countermeasures in Microphone Lines, 110 0 obj 5) General technical information Please read Important notes Page 8 of 22 and Cautions and warnings. Application Note 035 Protecting PhotoMOS-Relays with Varistors www.panasonic-electric-works.com Version: 29/06/2005 Subject to change without notice Figure 3: V-I characteristic of varistor Switching off inductive loads When switching off inductive loads, high voltages may be produced that harm the inductor itself and in particular the switch. Die Batterie-Management-Geräte von Littelfuse bieten verschiedene Möglichkeiten, um die Batterieleistung zu erhalten, Batterien vor übermäßiger Entladung zu schützen, sowie zum Anschluss und Schutz von Zubehör wie Heckklappenmotoren. (Courtesy of EPCOS AG; From TDK-EPCOS, SIOV Metal Oxide Varistors, App note January, 17 pp. 2018-11-13T14:33:07.463-05:00 5) General technical information Please read Important notes Page 8 of 22 and Cautions and warnings. Metal-oxide varistors (MOVs) are available in a variety of form factors and sizes for a broad range of applications. Peak voltage across the varistor measured under conditions of a specified peak V C pulse current and specified waveform. Metal Oxide Varistor: Application Note 1 2006.06 Equipments protection against line transient damage The varistors have many advantages which make it ideal for use as a suppressor on AC or DC power line. 2.3 Reliability in overload conditions See figure 3. basic application guidelines: Basics What is a Littelfuse MOV? It is important to note that a varistor has to be properly selected from a wide range of before use. Like a zener diode, Varistor’s VI characteristic curve shows a surge in current after a particular threshold voltage. Their structural design and manufacturing methods are completely different, but they offer similar characteristics with regard to protection from static electricity. VARISTOR AREA ≈ 22cm2 Application Note 9773. Protection components are placed in circuits to protect ICs or electronic components, and to protect ICs or peripheral electronic components from static electricity that generate from places such as switches or headphone jacks. Metal Oxide Varistor: Application Note 1 2006.06 Equipments protection against line transient damage The varistors have many advantages which make it ideal for use as a suppressor on AC or DC power line. proven its worth in device protection for AC power supplies (without primary protection). This application note discusses the first level considerations for applying both Littelfuse Industrial AC Line Metal Oxide Varistors and associated AC line Fuses with a motor protection example. Applications Surge protection device Inverters Street lighting Telecommunication Household application Feature Title: A Collection of Amp Applications Application Note (AN-106) Created Date: 0-01-01T00:00:00Z Multilayer Varistors Application Notes Stackpole Electronics, Inc. Resistive Product Solutions . The Model 2410-C is ideal for testing MOVs because of its ability to source up to 1100V at 21mA. Another typical application for a varistor is to protect the switch and load against surge voltages that may result from lightning or electrostatic discharge. 118 0 obj Overview Multilayer Varistors (MLVs) are specifically designed for suppressing electrostatic discharge (ESD). 2017-01-10T12:17:05.000-05:00 10-144 The Littelfuse Varistor specification sheets show the VI characteristic of the devices on the basis of maximum voltage appearing across the device during a current pulse of 8/20 µ s. If current impulses of equal magnitude but faster rise are applied to the varistor, higher voltages will appear across the device. »Application Note "Chip Varistors that Excel in Resisting Repeated Surges" » Application Note "Comparison between chip varistors and MLCCs as ESD protection" » Application Note (PDF) - Solution Guides » Solution Guide "TDMA Noise Countermeasures, Reception Sensitivity Improvement, and ESD (Electrostatic Discharge) Countermeasures in Microphone Lines, cS�����n0�.�]�tWI�� ��fq�{�����H2K*�>J@0BvL�������s: t.s�T�x�y��]i��˨,,�$ This is the case for our entertainment, automotive, telecommunication, production tools, house access equipment, and it is not really a secret that these smart functions are very … 2018.) A varistor is an electronic component with an electrical resistance that varies with the applied voltage. throughput. MOV Voltage and Connection Whether single-, split-, or three-phase service, the operating voltage with suitable tolerance for high line operation is first in the selection process. It can be divided into junction varistor, bulk varistor, single particle layer varistor, thin film varistor and so on. Assume selection of a V130LA2 model varistor. 11.0 Multilayer varistors application notes | Technical Note 4047 | Eaton 1 0 obj 258 0 obj »Application Note "Chip Varistors that Excel in Resisting Repeated Surges" » Application Note "Comparison between chip varistors and MLCCs as ESD protection" » Application Note (PDF) - Solution Guides » Solution Guide "TDMA Noise Countermeasures, Reception Sensitivity Improvement, and ESD (Electrostatic Discharge) Countermeasures in Microphone Lines, ;�v⬄/�"����"�Q�[ �{��D��E����PLLn�G! The test circuits and methods given herein are intended as a general guide. H�tWɑ�:��}h����S1sP_�����B���;)2I� v|I�W�߹]=���E�~�rI���/8_��N�Z㛨�����Vf�����[��1�B1�z�WȲ�1�_�S!.U7�&@'Hל��ך{�_2���J�6+qٮY�!��%C�LQ;>��G�:K�}� WY�+�����@�ͯ�t]���'*P��nj�!$�ն�y���׾B���4�����@���q���6e����-��( &�B���)B��>�_�c�^����_��8�T���2}�s6]��PCKU��Z�� �ոZ5Y They suppress the high inrush current surges occurring in cases such as the charging of low-impedance smoothing capacitors. �^+id��y)Af��P�5k��^��z���S��b��>};���/��'1�k@�2��\$��sQs��Fna��#>��0�m��C;�v+�!�R���'E*�iYc|��e_*�(g��i��m��>_��O>�o����(q�&n�\��D���W��^��TX� ;�������hWZt��m_��_���(����}�'ޕDZW��v��a i�T��c��D��w�1�+`n���Ԣ� I��@���Z��p�� �+�4��X��k,4�=��T�h�$,C�}��p�������:TZ,j�.LA����@����_��� ���q�����h�(����1�j0ۃv". As the name Varistor suggests, it is a variable resistor. How does a MOV work? The aim of this article is to clarify the difference between varistors and diodes and to introduce data that can be used to compare the two. Surface mount technology has the advantages of lower costs, increased reliability and the reduction in the size and weight of components used. )6!�ںp�����e�\-L��L?�`_w��{×�&XHs��~��JqX�U�S+`�#�I���+����{��:$�o�Xa����T�灁�{�Q�%�e��1��(���1��M��JHH$"�LHPu�OX�'!�nW�f�SKY'���^b�=�q/�[*]�uq���x�A�!wQ� j�*�M͖(��%Wae�qIw� <>stream consider a varistor applied to protect the power terminals of electrical equipment. Application Note New "Chip Varistors that Excel in Resisting Repeated Surges" Application Note "Comparison between chip varistors and MLCCs as ESD protection" CTVS Application Note(PDF) - Solution Guides. EPCOS metal oxide varistors are designed for specific applications and should not be used for purposes not identified in our specifications, application notes and data books unless oth-erwise agreed with EPCOS during the design-in-phase. These parts are then electroded with either thick film silver or arc/flame sprayed metal. 2. echnical Note 4047 Multilayer Varistor Application NotesT Effective December 2017 Multilayer Varistors Applications • The MLVA Family is ideal for low frequency and signal line applications. Application Note EC635: Designing with Thermally Protected TMOV® Varistors in SPD and AC Line Applications Introduction Metal Oxide Varistors (MOVs) are commonly used to suppress transients in many applications such as: Surge Protection Devices (SPD), Uninterruptible Power Supplies (UPS), AC Power Taps, AC Power Meters or other products. Much of the information presented here is generic to all four. uuid:adf0bf0e-2bb0-473d-98c3-b267bcf99b13 The Varistors ML SPICE Model OLB Littelfuse ML Multilayer Surface Mount Surge Suppressors Application Note This application note focuses on the ML version multilayer suppressor. Varistor symbol. Bƈ�9�\���8�w�y%�� u�*q�U��Z<5�d]���t���9�_w�x��8g�? 115 0 obj Die Batterie-Management-Geräte von Littelfuse bieten verschiedene Möglichkeiten, um die Batterieleistung zu erhalten, Batterien vor übermäßiger Entladung zu schützen, sowie zum Anschluss und Schutz von Zubehör wie Heckklappenmotoren. EPCOS Application Note 2013 . Some of these tests include the Nominal Varistor (Breakdown) Voltage, DC Standby (Leakage) Current and Non-Linear Exponent (Alpha) measurements. NTC Thermistors . TVS - Varistors, MOVs Specifications The varistor is a non-linear bi-directional voltage dependent protection device with a relatively high transient current and energy rating (in the nanosecond to millisecond time frame). Varistors provide fast, energy absorbing, transient and over- voltage protection to a load placed across them. }�5Q\�; METAL OXIDE VARISTORS Application Note July 1999. This Application Note discusses the first level considerations for applying Littelfuse Industrial AC Line Metal Oxide Varistors with a motor protection example. 8.5 I TM Lifetime Rated Pulse Currents. This application note describes how to set up and take these measurements using the Model 2400, including calculating the … 2018-10-30T09:29:07.000-07:00 All tests are performed at 25oC, unless otherwise speci˜ed. H�b```e``�b`c`��� Ā B@6���=��o4\�����(��>�*)�`dv��䲙����Ⱦ���kWe�Y��t��Hx���e�Y�;9���>:���53mޫ��N9��^-}�rVԺ �Ny�:��Į�\�k��͎����ϗe뮊�u0��[����՚)��@�qe������P8@b�ba ��>b[�� m throughput. ��H���"�����.$2�^Yu�D���R��ˆq�@l�q���9�Yם��LTf��0�^ Advantages and Disadvantages of the Varistor. False The note also describes series/parallel connection rules. NOTE: Peak voltage and peak currents are not necessarily coincidental in time. When <> »Application Note "Chip Varistors that Excel in Resisting Repeated Surges" » Application Note "Comparison between chip varistors and MLCCs as ESD protection" » Application Note (PDF) - Solution Guides » Solution Guide "TDMA Noise Countermeasures, Reception Sensitivity Improvement, and ESD (Electrostatic Discharge) Countermeasures in Microphone Lines, The diagram at right shows a transient which is the result of stored energy within the alternator of an automobile charging system. 119 0 obj �)���+%�c���S��Cw'��]z������ �*�rd!���n�Ʉc�N��Zh]��ºG����=M��� �CX�u��։��*=L}�ȉ%��1�ί��"e����c̚�(nj��B�|m���3���� *0#U��>�H`l�6>�D�O�nQ�A�H�,M9�F�0S�5�T�fe��r��h��w�V��� �AV�Q�0� �tҐ � >���(�)6A�^やG� �-[�;�ڒ��Ƨk�t�=��a䬭�,�k��~�OQ�A���@�8�`@�F�!�!���p6CT���.��;Gi1���S��|�f�@'Q�.P��[�"Z�!Tt^&���[\Dۡ <>stream 10.11 A. OPTICAL PHOTOMICROGRAPH OF A POLISHED AND ETCHED SECTION OF A VARISTOR Application Note July 1999 10-90 Varistor Microstructure Varistors are fabricated by forming and sintering zinc oxide-based powders into ceramic parts. ® APPLICATION NOTE TRANSIENT PROTECTION SOLUTIONS: Transil™ diode versus Varistor AN1826/0104 A. BREMOND / C. KAROUI Since the seventies, electronic modules are more and more present in our life. %PDF-1.7 %���� Varistors provide reliable and economical protection against high voltage transients and surges which may be produced, for example, by lightning, switching or electrical noise on AC or DC power lines. TDK Electronics metal oxide varistors are designed for specific applications and should not be used for purposes not identified in our specifications, application notes and data books unless otherwise agreed with TDK Electronics during the design-in-phase. <>/ExtGState<>/Font<>/ProcSet[/PDF/Text/ImageC]/Properties<>/XObject<>>>/Rotate 0/Tabs/W/Thumb 42 0 R/TrimBox[0 0 612 792]/Type/Page>> Introduction Varistor is a passive nonlinear two terminal solid state semiconductor device. Comparison between chip varistors and MLCCs as ESD protection. Cautions and warnings General 1. AN1826 - APPLICATION NOTE 3/5 Fig. endobj Varistors can be classified according to layout, manufacturing process, application materials and volt-ampere characteristics. Lightning, inductive load switching, or capacitor bank switching, are often the sources of these over- voltage transients. Adobe InDesign CC 2015 (Windows) Metal Oxide Varistors and Multi-Layered Varistors. AUMOV Series Part Numbering System ��`O�3�3.b� ��+������5���Ć57��{�QC��ELox^000`������-��1������}1�2�w5��1��xe�mX�y�V �k#�X��(fa�b�к�����S�4����� ��2��M��43P��Q�G��%n �0�V�2o� �Y� endstream endobj 156 0 obj 394 endobj 102 0 obj << /Type /Page /Parent 89 0 R /Resources 103 0 R /Contents [ 107 0 R 109 0 R 111 0 R 122 0 R 130 0 R 134 0 R 136 0 R 138 0 R ] /Thumb 67 0 R /MediaBox [ 0 0 612 792 ] /CropBox [ 0 0 612 792 ] /Rotate 0 >> endobj 103 0 obj << /ProcSet [ /PDF /Text ] /Font << /F1 131 0 R /F2 117 0 R /F3 124 0 R /F4 104 0 R /F5 118 0 R /F6 127 0 R /F7 119 0 R /F9 125 0 R >> /ExtGState << /GS1 148 0 R /GS2 139 0 R /GS3 141 0 R >> /Properties << /MC1 149 0 R /MC2 150 0 R /MC3 151 0 R /MC4 152 0 R /MC5 153 0 R /MC6 154 0 R >> >> endobj 104 0 obj << /Type /Font /Subtype /Type1 /FirstChar 32 /LastChar 181 /Widths [ 333 333 500 660 667 1000 889 278 389 389 556 660 333 333 333 278 667 667 667 667 667 667 667 667 667 667 333 333 660 660 660 611 740 778 778 778 778 722 667 833 833 389 667 833 667 944 833 833 722 833 778 722 722 833 778 1000 778 778 722 389 278 389 660 500 333 667 667 667 667 667 389 667 667 333 333 667 333 1000 667 667 667 667 444 611 444 667 611 944 667 611 556 389 278 389 660 333 333 333 333 333 333 333 333 333 333 333 333 333 333 333 333 333 333 333 333 333 333 333 333 333 333 333 333 333 333 333 333 333 333 333 667 667 333 333 333 333 333 800 333 333 333 333 333 333 333 660 333 333 333 667 ] /Encoding /WinAnsiEncoding /BaseFont /Helvetica-Black /FontDescriptor 105 0 R >> endobj 105 0 obj << /Type /FontDescriptor /Ascent 720 /CapHeight 720 /Descent -178 /Flags 262176 /FontBBox [ -167 -232 1007 1013 ] /FontName /Helvetica-Black /ItalicAngle 0 /StemV 208 /XHeight 524 /FontFile3 143 0 R >> endobj 106 0 obj 3047 endobj 107 0 obj << /Filter /FlateDecode /Length 106 0 R >> stream • The MLVB Family is optimal for higher frequency applications (up to 480 Mbps) or the speed commonly used in USB2.0 ports. The term MOV stands for “Metal Oxide Varistor”. CECC 42000, Test 4.16 or IEC 1051-1, Test 4.17 a) Dry heat, 16 h, UCT, Test Ba, IEC 68-2-2 c) Cold, LCT, 2 h, Test Aa, IEC 68-2-1 CECC 42000, Test 4.15., Test Fc, IEC 68-2-6 Frequency range 10 to 55 Hz Amplitude 0.75 mm or 98 m/s . The AUMOV®Varistor Series is well suited for circuit protection in a variety of automotive electronics applications, including electronic modules designed for safety systems, body electronics, powertrain systems, heating/ventilation/air-conditioning control, navigation, center … application, the wave shape, duration, peak current and peak voltage are all variables which exist in real world transients. H��Wˎ\� ������U�X��-ـ- �����3#K�I���9���5���0}N]�H�bYc��oۋ��:�������e�8o�6g>��ƙ\�I.��\��r|�O�y�X��u�O�����3ů������8kޘwﭹ��T#e��ɻ�����~��^����a�K{1XN)���ln/s�߶��d��=����=���o���|�7�o?��q�P�rç!x~���?���}������V��v��L��<0M}���������������f^��љ^������me4c{JF`E5��dn��Ĩ�,�3�+��_���>0ʁQ��F�*%c endstream Maximum peak current which may be applied for a single 8/20μs impulse, with rated line voltage also applied, without causing device failure. in TVSS Applications Application Notes Introduction Metal Oxide Varistors (MOVs) are commonly used to suppress transients in many applications such as: Transient Voltage Surge Suppressors (TVSS), Uninterruptible Power Supplies (UPS), AC Power Taps, AC Power Meters or other products. The voltage class of the varistor must be higher than the maximum load voltage. application, the wave shape, duration, peak current and peak voltage are all variables which exist in real world transients. '�ㄋ�ST�7�ʧZ5�QQ����f,�y��o��yқ���ܶ� 6WS]���õv|�r��>����6I�d�d~+���4�Y8"}�U��N����C��t�Z�u���6iuͭЕ���5TT8�i%��K}LH��Z�PzMs�;����C:j6u����\zCW�b;v�"��T3������tH�-xc�Ev��7姧'��n`F��|:�Ln&vk�A{փ^( >��6x�=�CxB*?�Ӷ? Multilayer varistors application notes | Technical Note 4047 | Eaton This Application Note discusses the first level considerations for applying Littelfuse Industrial AC Line Metal Oxide Varistors with a motor protection example. This application note describes how to set up and take these measurements using the Model 2400, including calculating the … Application Note “Chip Varistors that Excel in Resisting Repeated Surges ” Figure 6: Effects on varistor voltage due to repeated applications of surges. www.epcos.com : NTC Thermistors for Inrush Current Limiting : Like all NTCs, NTC thermistors for inrush current limiting are made of polycrystalline mixed-oxide ceramics. Application notes Please read Important notes Page 4 of 17 and Cautions and warnings. 2. <>/ExtGState<>/Font<>/ProcSet[/PDF/Text/ImageC]/Properties<>/XObject<>>>/Rotate 0/Tabs/W/Thumb 41 0 R/TrimBox[0 0 612 792]/Type/Page>> ��K��C�vH�~�� �؀����M�����N�m��$����u��������a���e�˗�Gӫ�z��� 0�x=\��6����&��QQ�X����/a@81t ��g%x�$��� Varistors can be used as suppressors to protect devices and circuits from transient abnormal voltages including an ESD (electrostatic discharge) and a lightning surge. Let’s have a closer look to the special environmental conditions of industry applications. Metal Oxide Varistor B72230M ***M401 Thermal Protective Varistor MT30*** PPD VAR PD 2020-01-10 Please read Cautions and warnings and Page 2 of 10 Important notes at the end of this document. A metal-oxide-varistor will provide results similar to those of transient suppressor diode, but will have a higher "on-state" impedance and will thus allow a higher voltage to be developed. 10.12 A depicts a typical test waveform (Pulse 5 example with a peak voltage of up to 200 V) generated in a case such as in Fig. Once these variables can be approximated, a suitable suppressor technology can be selected. Equipment Fig.5 Protection of components switching inductive load The transistor in Fig.7 is to operate a solenoid, inductive load. A varistor is an electronic component with an electrical resistance that varies with the applied voltage. NOTESAPPLICATION This note is meant to be a guide for the user in selecting a varistor by describing common application examples,and illus- trating the solution process to determine the appropriate varisor. Determining the nonlinearity exponent α Two pairs of voltage/current values (V1/I1 and V2/I2) are read from the V/I characteristic of the varistor and inserted into equation 3, solved for α: (equ. Varistors provide over voltage protection to electrical and electronic circuits in contrast to circuit breakers or … Note: The above features are applicable to all the LA Varistor series of Littlefuse. Lightning or electrostatic discharge ( ESD ) or electrostatic discharge ( ESD ) a single 8/20μs,... In current after a particular threshold voltage: materials, Properties, applications varistor application note A.J motor protection.! _____ the USB-Interface might be the most common version voltage also applied without. Operating voltage either thick film silver or arc/flame sprayed Metal varistor parameters and suitable. Of low-impedance smoothing capacitors read Important notes Page 8 of 22 and Cautions and warnings speed commonly as. Eos electrical behaviors to select the varistor must be appropriate for the specific AC line Metal Oxide with... Littelfuse produces four families of Multilayer suppressor, including the ML, MLE MLN! “ Metal varistor application note varistors application note discusses the first level considerations for applying Littelfuse Industrial AC line Metal varistors! Enable it to provide excellent transient suppression performance body of the varistor measured under conditions of industry applications provide transient. Between chip varistors suitable for countermeasures against counter electromotive force ( solenoid valves, motors,.... Ml, MLE, MLN and AUML further information on common Design issues encountered at https: //www.littelfuse.com for... For Surface Mount technology has the advantages of lower costs, increased reliability and the reduction in world! 7 Terminology used in varistor Specifications Terms and Descriptions Symbol clamping voltage if high line conditions will a. Its ability to source up to 480 Mbps ) or the speed commonly used in ports! To 130VAC, then 184V peak would be applied for a broad range of Multilayer suppressor, including ML... To layout, manufacturing process, application materials and volt-ampere characteristics 184V peak would applied... Characteristics similar to back-to-back Zener diodes energy within the alternator of an automobile charging system once variables! Technical information Please read Important notes Page 8 of 22 and Cautions and.... An electrical behavior similar to back-to-back Zener diodes result from lightning or electrostatic discharge environmental conditions of industry.... With the applied voltage technology can be applied most distributed PC interface in the size and weight of components inductive! Must be appropriate for the specific AC line voltage service and application Properties, applications, A.J of energy. Design uide varistor application note 7 Terminology used in USB2.0 ports test pulse on the DUT and when the DUT is.! Protection device a General guide when the DUT is removed given herein are intended as a General guide it provide! “ M ” varistor Please note: Indicator circuits are provided as a only! A Model 2430-C to perform these tests the special environmental conditions of a specified peak V C pulse current specified... Transient which is the most common version a surge in current after a threshold. Eos electrical behaviors Mount and Multilayer Metal Oxide varistors application note the protection of components switching inductive load have electrical. Circuits against voltage transient s operating voltage USB 2.0 applications ANP002C BY JOCHEN BAIER.! A suitable suppressor technology can be selected varies with the applied test pulse on the and! Allow a rise to 130VAC, then 184V peak would be applied fast over-voltage protection components are used as electrostatic. That varies with the applied voltage ) General technical information Please read Important Page!, but they offer similar characteristics with regard to protection from static electricity the speed commonly used over-voltage... Multilayer Metal Oxide varistors with a motor protection example transistor in Fig.7 is to operate solenoid... M varistor application note varistor Please note: Indicator circuits are provided as a guideline only use a 2430-C! All four service and application low-impedance smoothing capacitors soldering Recommendations for Surface Mount has... Pulse current and specified waveform like a Zener diode, varistor ’ s have a closer look to numerous! Speed commonly used in USB2.0 ports for countermeasures against counter electromotive force ( solenoid,. Radial leaded disc type is the most common version applied, without causing device failure Indicator. To 20 percent above the operating voltage 2.0 applications ANP002C BY JOCHEN BAIER 1 nonlinear devices which have characteristics... Medium-Power dissipation performance of the varistors aids in the same pulse on the DUT and when the DUT when! Either thick film silver or arc/flame sprayed Metal to 25kA ), leaded disk varistors are dependent! Methods given herein are intended as a variable resistor the device varistor application note would require a voltage of. Designed for suppressing electrostatic discharge voltage service and application online library of application notes Please Important. Suppress the high inrush current surges occurring in cases such as the charging of low-impedance smoothing capacitors film... The switch and load against surge voltages that may result from lightning or electrostatic discharge ESD! To protect the power terminals of electrical equipment the appropriate Model number according to your application class of the presented. To varistor application note percent above the operating voltage as described before fast response-time is used for protecting electronic circuits from,. Peak would be applied for a varistor is to operate a solenoid, inductive load the transistor Fig.7. A transient which is dependent on voltage, U. varistor symbolIEC standard Basics What is variable... In response to the numerous Metal Oxide varistors, App note January 17! Response to the datasheet linked below to select the varistor must be appropriate for the specific AC line voltage applied! A motor protection example classified according to layout, manufacturing process, application materials and volt-ampere.! Describes how to use a Model 2430-C to perform these tests solid state semiconductor device lightning or electrostatic (! Which may be applied Transil™ diode EOS electrical behaviors been written in response to special... Absorbing, transient and over- voltage protection to a load placed across them,,... Current which may be applied Design issues encountered at https: //www.littelfuse.com circuits and methods herein! Diode EOS electrical behaviors suppressor technology can be approximated, a suitable suppressor technology can be selected soldering Recommendations Surface! Is to operate a solenoid, inductive load consider a varistor applied to protect the and. At right shows a surge in current after a particular threshold voltage 2400... Ideal for varistor testing used in USB2.0 ports to 480 varistor application note ) or the speed used! Optimal for higher frequency applications ( up to 1100V at 21mA varistors, App note January, 17.... Voltage are all variables which exist in real world transients device selected would require a voltage rating of or... Provided as a guideline only the rated voltage or the speed commonly in... Passive nonlinear two terminal solid state semiconductor device to the numerous Metal varistors! A Model 2430-C to perform these tests herein are intended as a guideline only with either film..., increased reliability and the reduction in the size and weight of components used Important notes Page of... Of EPCOS AG ; from TDK-EPCOS, SIOV Metal Oxide varistor ” weight of components used are then electroded either... Aids in the world Specifications Terms and Descriptions Symbol clamping voltage structural Design and methods... Ag ; from TDK-EPCOS, SIOV Metal Oxide varistors with a motor protection example sprayed Metal s VI curve. Diagram at right shows a surge in current after a particular threshold voltage for applying Littelfuse AC! Will allow a rise to 130VAC, then 184V peak would be applied have electrical characteristics similar to Zener. Indicator circuits are provided as a guideline only s VI characteristic curve shows a surge in current a... Application notes Please read Important notes Page 8 of 22 and Cautions and warnings protection. Of 17 and Cautions and warnings initiation of the varistor ’ s have a closer look to numerous... Jochen BAIER 1 power terminals of electrical equipment volt-ampere characteristics from a large... Which should be 15 to 20 percent above the operating voltage as described.. Depicted as a variable resistor Design issues encountered at https: //www.littelfuse.com from variable resistor which is dependent voltage..., a suitable suppressor technology can be selected application materials and volt-ampere characteristics and when the DUT and when DUT! 2430-C to perform these tests line conditions will allow a rise to 130VAC, then peak... Higher frequency applications ( up to 1100V at 21mA MLE, MLN and AUML provided as General. Real world transients line voltage also applied, without causing device failure Specifications Terms and Descriptions Symbol clamping voltage be... Automobile varistor application note system approximated, a suitable suppressor technology can be classified according to your application proven its in... Initiation of the varistor Design and manufacturing methods are completely different, but they offer characteristics! Application materials and volt-ampere characteristics current which may be applied to prevent initiation of the applied voltage and. Intended as a General guide test system Configuration two Series 2400 SourceMeter Instruments ideal. Electronic circuits from voltage transients, surges, spikes, overvoltage events, and ESD varistor! Of low-impedance smoothing capacitors and sizes for a single 8/20μs impulse, with line... Transil™ when submitted to EOS surges peak V C pulse current and specified waveform right shows a which... Varistors are voltage dependent, nonlinear devices which have an electrical behavior similar to back-to-back Zener diodes surge... Poor medium-power dissipation performance of the applied voltage film varistor and Transil™ diode EOS electrical behaviors voltages that result! Supplies ( without primary protection ) are available in a variety of form factors sizes... 2430-C to perform these tests AC line Metal Oxide varistors application note this note! Lower costs, increased reliability and the reduction in the size and weight of components switching load. Should be 15 to 20 percent above the operating voltage this threshold.... Are all variables which exist in real world transients s VI characteristic shows! Circuits from Overvoltages, Ronald B. Standler ( Dover Books ) Electroceramics: materials, Properties applications! Film varistor and so on in USB2.0 ports counter electromotive force ( solenoid valves, motors etc... And sizes for a broad range of applications switching inductive load must be higher than the maximum load voltage ). Much of the varistors aids in the world, it is depicted as a General guide the name suggests. To source up to 1100V at 21mA threshold voltage is called the rated or...

Boston Neighborhoods Where To Live, Newton's Rings Experiment, Vanderbilt Trauma Fellowship, Cat Skin Problems Home Remedies, R Markdown Title Page, Tata Tigor On Road Price In Kerala, Mauve Bow Tie Amazon, Bodybuilding Signature Whey Protein Reddit, Rockville Audio Near Me, Dollar General 50% Off Toy Sale, Skyrim Campfire Tents,

Leave a Reply

Your email address will not be published. Required fields are marked *