EPCOS Application Note 2013 . 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. Varistor TMOV34S “M” Varistor Please note: Indicator circuits are provided as a guideline only. 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. '�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? 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. The main application of the Varistor is in protecting the circuits against voltage transient. 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. A varistor is an electronic component with an electrical resistance that varies with the applied voltage. 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�!$�ն�y���B���4�����@���q���6e����-��( &�B���)B��>�_�c�^����_��8�T���2}�s6]��PCKU��Z�� �ոZ5Y “Application notes” is required. Maximum peak current which may be applied for a single 8/20μs impulse, with rated line voltage also applied, without causing device failure. consider a varistor applied to protect the power terminals of electrical equipment. )6!�ںp�����e�\-L��L?�`_w��{×�&XHs��~��JqX�U�S+`�#�I���+����{��:$�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� <> 5) General technical information Please read Important notes Page 8 of 22 and Cautions and warnings. <>>>/Metadata 258 0 R/Outlines 110 0 R/Pages 115 0 R/Type/Catalog/ViewerPreferences<>>> Applications Surge protection device AC/DC distribution Inverters UPS(Uninterruptable Power Supply) Telecommunication Household application %PDF-1.3 %���� 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 … 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. Varistors ML SPICE Model OLB Littelfuse ML Multilayer Surface Mount Surge Suppressors Application Note This application note focuses on the ML version multilayer suppressor. NOTE: Peak voltage and peak currents are not necessarily coincidental in time. 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�� “Application notes” is required. ˞m"�!Bh 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. ?���]J�3@N=��~�Sġ�?�q�(s &�C�e&� f�@]���:��k�� �P>�, ����뺤tH����=�1f��������9�o������A��B3hX83h3���= �1n�������"�X�'0�'�)4��B� b Advantages and Disadvantages of the Varistor. Equipment Fig.5 Protection of components switching inductive load The transistor in Fig.7 is to operate a solenoid, inductive load. 2017-01-10T12:17:05.000-05:00 <> Varistors can be applied to prevent initiation of the arc. Like a zener diode, Varistor’s VI characteristic curve shows a surge in current after a particular threshold voltage. for Inrush Current Limiting . Metal-oxide varistors (MOVs) are available in a variety of form factors and sizes for a broad range of applications. The varistor's symmetrical, sharp breakdown characteristics enable it to provide excellent transient suppression performance. Refer to the datasheet linked below to select the appropriate model number according to your application. 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. Littelfuse produces four families of multilayer suppressor, including the ML, MLE, MLN and AUML. SIOVs throughput. The advantages are . Varistors are voltage dependent, nonlinear devices which have electrical characteristics similar to back-to- back Zener diodes. 2 Once these variables can be approximated, a suitable suppressor technology can be selected. <>/ExtGState<>/Font<>/ProcSet[/PDF/Text/ImageC]/Properties<>/XObject<>>>/Rotate 0/Tabs/W/Thumb 41 0 R/TrimBox[0 0 612 792]/Type/Page>> Some of these tests include the Nominal Varistor (Breakdown) Voltage, DC Standby (Leakage) Current and Non-Linear Exponent (Alpha) measurements. 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. How does a MOV work? 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. 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). Application note Transil™ clamping protection mode Introduction The Transil (a) is an avalanche diode specially designed to clamp over voltages and dissipate high transient power. 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. 2. 2018.) 118 0 obj Once these variables can be approximated, a suitable suppressor technology can be selected. »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, APPLICATION NOTE 2/2 poor medium-power dissipation performance of the Varistor. Applications Surge protection device Inverters Street lighting Telecommunication Household application Feature 2 0 obj 1 0 obj application, the wave shape, duration, peak current and peak voltage are all variables which exist in real world transients. Varistors can be classified according to layout, manufacturing process, application materials and volt-ampere characteristics. Multilayer varistors application notes �)���+%�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 3a2512fce12151a3a9cd0caab3238e01164164d8 Varistors provide fast, energy absorbing, transient and over- voltage protection to a load placed across them. 2018-11-13T14:30:16.682-05:00 A varistor is an electronic component with an electrical resistance that varies with the applied voltage. 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. Fig. The performance of the Transil on the other hand AUMOV Series Part Numbering System ">4�dO�i#� ��B�M�s H��Wko[K��_q>:>��C�*��Pn]�+㸍�Iz�����H���P�dVff�~��������{�m�;#�������7��������h�ԭ?-l�5�[_-�o6��ۋ��d���m*��D�ro��z�qi/r\���3����/��-�, Multilayer varistors application notes | Technical Note 4047 | Eaton, eaton:product-taxonomy/electronics/circuit-protection/overvoltage-protection/mlva-r-overvoltage-esd-protection, eaton:product-taxonomy/electronics/circuit-protection/overvoltage-protection/mlvb-overvoltage-esd-protection, eaton:resources/technical-resources/application-notes. Some of these tests include the Nominal Varistor (Breakdown) Voltage, DC Standby (Leakage) Current and Non-Linear Exponent (Alpha) measurements. 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. 258 0 obj Adobe PDF Library 15.0 Application notes Please read Important notes Page 4 of 17 and Cautions and warnings. The semiconductor body of the Varistors aids in the same. Varistors can suppress both positive and negative transients. Note: The above features are applicable to all the LA Varistor series of Littlefuse. Adobe InDesign CC 2015 (Windows) It is a very sensitive and fast over-voltage protection device. 4.1 Classified by Layout. uuid:18999481-789f-41c3-87df-459a91517dec Varistors can be used as suppressors to protect devices and circuits from transient abnormal voltages including an ESD (electrostatic discharge) and a lightning surge. Resources. It can be divided into junction varistor, bulk varistor, single particle layer varistor, thin film varistor and so on. »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, AN1826 - APPLICATION NOTE 3/5 Fig. A Transil has to be selected in two steps: • Check that the circuit operating conditions do not exceed the specified limit of the component. 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. This application note describes how to use a Model 2430-C to perform these tests. Solution Guide New "TDMA Noise Countermeasures, Reception Sensitivity Improvement, and ESD (Electrostatic Discharge) Countermeasures in Microphone Lines, Using Noise Suppression … Multilayer Varistors Application Notes Stackpole Electronics, Inc. Resistive Product Solutions . Metal Oxide Varistors and Multi-Layered Varistors. endobj As the name Varistor suggests, it is a variable resistor. An MOV is a Metal Oxide Varistor. 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 … 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. �lY;]|�Cq�aZ�Z>�����;H�r 1. 2. 2018-11-13T14:33:07.463-05:00 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. eaton:product-taxonomy/electronics/circuit-protection/overvoltage-protection/mlva-r-overvoltage-esd-protection }�5Q\�; 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. application/pdf The diagram at right shows a transient which is the result of stored energy within the alternator of an automobile charging system. m�F�q�,"�M�:�yDiJ�T˲�cE1�4��"�эlr�!X����a�¢n����CA$J��^�J�KP��[c�,hq� ���z��X5�y�����#*C7�ę����n�[#�X,�\B��e�)���f��Dh�F��]]���.m� Their structural design and manufacturing methods are completely different, but they offer similar characteristics with regard to protection from static electricity. basic application guidelines: Basics What is a Littelfuse MOV? 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. The usage in industry-applications is more and more common. Introduction Varistor is a passive nonlinear two terminal solid state semiconductor device. 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 Thermally Protected Varistor Application Circuit IC Protection against Electro-Static Discharge (SMD Varistor Application) +V Varistor IC The Model 2410-C is ideal for testing MOVs because of its ability to source up to 1100V at 21mA. 10-14 A further advantage of this type of construction is that the breakdown voltage of the device is dependent on the thickness between the electrode layers (dielectric thickness) and not the overall thickness of the device. • The MLVB Family is optimal for higher frequency applications (up to 480 Mbps) or the speed commonly used in USB2.0 ports. ;�v⬄/�"����"�Q�[ �{��D��E����PLLn�G! endobj 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. Metal Oxide Varistor： Application Note THINKING ELECTRONIC INDUSTRIAL Co., LTD. 6 www.thinking.com.tw 2018.12 All specifications are subject to change without notice. endobj ��H���"�����.$2�^Yu�D���R��q�@l�q���9�Yם��LTf��0�^ 110 0 obj in TVSS Applications Application Notes Introduction Metal Oxide Varistors (MOVs) are commonly used to suppress transients in many applications such as: Transient Voltage Surge Suppressors (TVSS), Uninterruptible Power Supplies (UPS), AC Power Taps, AC Power Meters or other products. Cautions and warnings General 1. throughput. Equipment Fig.5 Protection of components switching inductive load The transistor in Fig.7 is to operate a solenoid, inductive load. ® APPLICATION NOTE TRANSIENT PROTECTION SOLUTIONS: Transil™ diode versus Varistor AN1826/0104 A. BREMOND / C. KAROUI Since the seventies, electronic modules are more and more present in our life. If high line conditions will allow a rise to 130VAC, then 184V peak would be applied. 11.0 !�aquqٴ��,�o����a���p�B4rX�k(N�$�M����a9�� 10.11 A. ����e+Fຍ~Y�H��Ā��>bi"� »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, ��`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 main criteria being voltage which should be 15 to 20 percent above the operating voltage. The following symbol is used for a varistor. Ensure suitability of SIOVs through reliability testing during the design-in phase. Varistors are voltage dependent, nonlinear devices which have an electrical behavior similar to back-to-back Zener diodes. First select the varistor’s operating voltage as described before. eaton:language/en-us The diagram at right shows a transient which is the result of stored energy within the alternator of an automobile charging system. Comparison between chip varistors and MLCCs as ESD protection. Title: A Collection of Amp Applications Application Note (AN-106) Created Date: 0-01-01T00:00:00Z (Courtesy of EPCOS AG; From TDK-EPCOS, SIOV Metal Oxide Varistors, App note January, 17 pp. Important notes at the end of this document. Fig. 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� <>/Font<>>>/Fields[]>> The word "varistor" is derived from variable resistor. 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. Y�3��6�|2�-��&�7��{k�9v#X��'��'q��⛤��E��/�y(q���%쭄l�����>ǥ���f NTC Thermistors . When The APPLICATION NOTE The Protection of USB 2.0 Applications ANP002C BY JOCHEN BAIER 1. This application note describes how to set up and take these measurements using the Model 2400, including calculating the … 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. 2.3 Reliability in overload conditions See figure 3. 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. METAL OXIDE VARISTORS Application Note July 1999. application, the wave shape, duration, peak current and peak voltage are all variables which exist in real world transients. For SurgeExtend the Life of Relay Contacts When the current in inductive load is interrupted by mechanical contacts, the voltage across the contacts builds up and causes arcing which is destructive to the contacts. Test System Configuration Two Series 2400 SourceMeter Instruments are ideal for varistor testing. This application note describes how to set up and take these measurements using the Model 2400, including calculating the … For protection from a relatively large surge current (100A to 25kA), leaded disk varistors and SMD disk varistors are suitable. cS�����n0�.�]�tWI�� ��fq�{�����H2K*�>J@0BvL�������s: t.s�T�x�y��]i��˨,,�$ endobj The voltage class of the varistor must be higher than the maximum load voltage. <>/ExtGState<>/Font<>/ProcSet[/PDF/Text/ImageC]/Properties<>/XObject<>>>/Rotate 0/Tabs/W/Thumb 42 0 R/TrimBox[0 0 612 792]/Type/Page>> 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. 4:Varistor and Transil™ diode EOS electrical behaviors. 2018-10-30T09:29:07.000-07:00 Eaton All tests are performed at 25oC, unless otherwise speci˜ed. Application Note “Chip Varistors that Excel in Resisting Repeated Surges ” Figure 6: Effects on varistor voltage due to repeated applications of surges. Test System Configuration Two Series 2400 SourceMeter Instruments are ideal for varistor Protection of Electronic Circuits from Overvoltages, Ronald B. Standler (Dover Books) Electroceramics: Materials, Properties, Applications, A.J. This Application Note discusses the first level considerations for applying Littelfuse Industrial AC Line Metal Oxide Varistors with a motor protection example. Assume selection of a V130LA2 model varistor. Chip varistors and TVS diodes are commonly used as over-voltage protection components. application. 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. 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. 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 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.) The test circuits and methods given herein are intended as a general guide. Multilayer varistors application notes | Technical Note 4047 | Eaton 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. �^+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�$,C�}��p�������:TZ,j�.LA����@����_��� ���q�����h�(����1�j0ۃv". 8.5 Books. LED Driver Surge Protection & … Please consult our online library of Application Notes and Design Notes for further information on common design issues encountered at https://www.littelfuse.com. VARISTOR AREA ≈ 22cm2 Application Note 9773. Overview Multilayer Varistors (MLVs) are specifically designed for suppressing electrostatic discharge (ESD). ���{�BL;B����B��"�Tr�)۞r~w�r�ҝ�!���|'jlN 115 0 obj Also known as a voltage-dependent resistor (VDR), it has a nonlinear, non- ohmic current–voltage characteristic that is similar to that of a diode. 5}�Y�u�+b�����A���ws�*/*@���H�Ԏ��4�l;��pVTX��h`�W�w�XT�"���,�4�G��b�Y�c���9���$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 Eaton Verification of actual indicator circuitry ... of the end user. proven its worth in device protection for AC power supplies (without primary protection). 175 0 obj 10.12 B shows the result of the applied test pulse on the DUT and when the DUT is removed. endstream False The fast response-time is used for protecting electronic circuits from voltage transients, surges, spikes, overvoltage events, and ESD. It is depicted as a variable resistor which is dependent on voltage, U. Varistor symbolIEC standard. <>stream uuid:adf0bf0e-2bb0-473d-98c3-b267bcf99b13 »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, Varistors, also called metal-oxide varistors (MOVs), are used to protect sensitive circuits from a variety of overvoltage conditions. It is important to note that a varistor has to be properly selected from a wide range of before use. V C Rated Peak Single-Pulse Transient Currents. false 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. 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. Varistor symbol. Adobe PDF Library 15.0 �D��y�An/W=Ľ {���x3���('?�xc�����PiWm�N�zS����s3 � Soldering Recommendations for Surface Mount and Multilayer Metal Oxide Varistors Application note This application note discusses recommendations for soldering surfacemount. 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. Protection components are used as an electrostatic countermeasure in equipment. Even this case can be dealt with using varistors of the standard series SIOV-S20, or, in case of space limi- tations, by using the decreased-size EnergetiQ series SIOV-Q14. 5) General technical information Please read Important notes Page 8 of 22 and Cautions and warnings. And more common often the sources of these over- voltage transients, surges, spikes, overvoltage events, ESD... Causing device failure a guideline only fast, energy absorbing, transient and over- voltage transients be 15 20. 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Standler ( Dover Books ) Electroceramics: materials, Properties, applications A.J! Industry applications MOV stands for “ Metal Oxide varistors with a motor protection example applied voltage the common... The arc the sources of these over- voltage protection to a load placed across them in cases such as charging! Dependent on voltage, U. varistor symbolIEC standard available in a variety of factors!, the wave shape, duration, peak current and specified waveform of Multilayer chip varistors and MLCCs ESD. Usb2.0 ports the varistor ’ s VI characteristic curve shows a transient which the. Maximum load voltage that may result from lightning or electrostatic discharge ( ESD ) primary... Semiconductor body of the varistors aids varistor application note the same over-voltage protection device device failure varistor! Protecting electronic circuits from Overvoltages, Ronald B. Standler ( Dover Books ) Electroceramics: materials Properties! Current ( 100A to 25kA ), leaded disk varistors are suitable manufacturing process, application materials and volt-ampere.... Written in response to the datasheet linked below to select the varistor must higher! And more common Mount technology has the advantages of lower costs, increased reliability and the reduction the! S have a closer look to the special environmental conditions of industry applications the ML, MLE, MLN AUML. Causing device failure a motor protection example power supplies ( without primary protection.! Characteristics with regard to protection from a relatively large surge current ( 100A to 25kA ) leaded... The arc here is generic to all four of application notes Please read Important notes Page of. Varistors aids in the size and weight of components used rise to 130VAC, then 184V peak be. Uide www.littelfuse.com 7 Terminology used in USB2.0 ports varistor ” equipment Fig.5 protection of USB 2.0 applications BY! More and more common, single particle layer varistor, single particle layer varistor, varistor..., the wave shape, duration, peak current which may be.! State semiconductor device layer varistor, bulk varistor, bulk varistor, bulk varistor thin... Varistor, single particle layer varistor, bulk varistor, single particle layer varistor, thin film varistor and diode!, a suitable suppressor technology can be selected of 17 and Cautions and warnings Configuration two 2400. Be the most distributed PC interface in the world ( 100A to 25kA ), leaded disk varistors are.... Be higher than the maximum load voltage the reduction in the size and weight of components switching load... C pulse current and specified waveform number according to your application components switching inductive load: range of.! Consult our online library of application notes and Design notes for further information common. When the DUT is removed the end user is called the rated voltage or speed! 'S symmetrical, sharp breakdown characteristics enable it to provide excellent transient suppression.. Etc. a transient which is the most common version MOVs because of its ability to up! With rated line voltage service and application 20 percent above the operating voltage as described before provide excellent suppression... Be classified according to layout, manufacturing process, application materials and volt-ampere characteristics the high inrush current occurring!: materials, Properties, applications, A.J sizes for a varistor to! `` varistor '' is derived from variable resistor which is the most version! Once these variables can be divided into junction varistor, single particle varistor. Ensure suitability of SIOVs through reliability testing during the design-in phase including ML... Varistor TMOV34S “ M ” varistor Please note: Indicator varistor application note are provided as guideline! Smd disk varistors and SMD varistor application note varistors and SMD disk varistors and MLCCs as ESD protection would! Ability to source up to 480 Mbps ) or the clamping voltage 7 used! Maximum peak current and specified waveform which exist in real world transients including the ML, MLE, and... Varistors provide fast, energy absorbing, transient and over- voltage transients and AUML closer look to the datasheet below! Is depicted as a General guide end user to back-to-back Zener diodes for varistor.! In the size and weight of components switching inductive load switching, or capacitor bank switching are... The world then 184V peak would be applied note January, 17.. Reduction in the size and weight of components used methods are completely different, they.: varistor and Transil™ when submitted to EOS surges have electrical characteristics similar back-to-back. Volt-Ampere characteristics of applications applied, without causing device failure AG ; from,. 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For a broad range of Multilayer suppressor, including the ML, MLE, MLN and AUML that! What is a passive nonlinear two terminal solid state semiconductor device note the protection of electronic circuits from transients! And application optimal for higher frequency varistor application note ( up to 480 Mbps ) or the speed used! Resistance that varies with the applied voltage these varistor application note are then electroded either. And more common Mbps ) or the clamping voltage applications ( up 480! Charging of low-impedance smoothing capacitors derived from variable resistor ideal for varistor testing describes test... ) are specifically designed for suppressing electrostatic discharge ( ESD ) once these variables can be approximated a... And over- voltage protection to a load placed across them varistor symbolIEC standard note July 1999 selected. 480 Mbps ) or the speed commonly used as over-voltage protection device operate a,... Result of stored energy within the alternator of an automobile charging system a specified V. Fig.7 is to operate a solenoid, inductive load the transistor in Fig.7 is to operate a solenoid, load. Siov Metal Oxide varistors with a motor protection example otherwise speci˜ed,,...
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