EZJZ1V330GM

UPDATE Multilayer Varistor Automotive grade EZJZ-M，EZJP-M series Features ● Excellent ESD suppression due to original advanced material technology ● Having large electrostatic resistance meeting IEC61000-4-2, ISO10605 ● Having no polarity (bipolar) facilitated replacing Zener Diodes. Capable of replacing 2 Zener Diodes and 1 Capacitor ● Lead-free plating terminal electrodes enabling great solderability ● Wide range of products is available by adopting multilayer structure, meeting various needs ● AEC-Q200 compliant ● RoHS compliant Explanation of part numbers 1 2 3 4 5 6 7 8 9 10 11 E Z J P 0 V 2 7 0 E M Product code Code Series Z EZJZ P EZJP Example Automotive grade Code Dimensions (mm) (inch) 0 1005 (0402) 1 1608 (0603) 2 2012 (0805) Code Packaging style 0402, 0603 Punched carrier taping 0805 Embossed carrier tape V Y Nominal varitor voltage The first and second digits denote the first 2 numbers of the varistor voltage and the third digit indicates the number of zeros following. The decimal point denotes in R. Code Capacitance Code B 10 pF F 68 pF R 20 pF G 100 pF D 27 pF H 150 pF E 47 pF J 220 pF W 56 pF K 330 pF Capacitance Construction ③ ④ ⑤ Name ① Zinc oxide-based ceramics ② Internal electrode Substrate electrode ③ ② ① No. ④ Terminal electrode Intermediate electrode External electrode ⑤ Dimensions in mm (not to scale) L Unit : mm W T L1 L2 Size code Size(inch) 0 1 2 0402 0603 0805 L 1.00 ± 0.05 1.6 ± 0.1 2.0 ± 0.2 W 0.50 ± 0.05 0.8 ± 0.1 1.25 ± 0.2 Design and specifications are each subject to change without notice. Ask factory for the current technical specifications before purchase and/or use. Should a safety concern arise regarding this product, please be sure to contact us immediately. T 0.50 ± 0.05 0.8 ± 0.1 1.25 ± 0.2 L 1, L 2 0.2 ± 0.1 0.3 ± 0.2 0.5 ± 0.25 26-Jan-24 Multilayer Varistor (Automotive grade) / EZJZ-M，EZJP-M series Features Recommended applications Wide variety of products is available by adopting multilayer construction, which achieved wide range of usage, such as application to DC voltage lines and signal lines. ● Engine ECU ● Varistor voltage：12 to 100 V (at 1 mA) ● Audio,Navigation ● Various body ECU ● Communication line, such as CAN，LIN allowable Maximum ● Capacitance：10 to 220 pF max. (at 1 MHz) ● LED Light ● Control SW 40 30 26 16 13 11 6.7 5.6 3.7 3 5 12 24 40 Circuit voltage DC (V) Ratings and characteristics Size (inch) Part No. EZJP0V120JM 220 max. [150 typ.] 175 typ. Maximum peak current at 8/20 μs, 2 times (A) 10 Capacitance (pF) at 1 MHz at 1 kHz EZJP0V180HM 11 18 150 max. [120 typ.] 140 typ. 10 EZJP0V220HM 13 22 150 max. [100 typ.] 116 typ. 10 EZJP0V270GM 18 27 100 max. [85 typ.] 100 typ. 10 EZJP0V270EM 18 27 47 max. [33 typ.] 37 typ. 4 EZJP0V270RM 18 27 20 max. [15 typ.] 16.5 typ. 2 EZJP0V270BM 18 27 10 max. [8 typ.] 10 typ. EZJP0V330GM 25 33 100 max. [85 typ.] 100 typ. 一 10 EZJP0V420WM 30 42 56 max. [40 typ.] 45 typ. 6 EZJP0V650DM 40 65 27 max. [22 typ.] 33 typ. 2 EZJP0V101BM 30 100 10 max. [8 typ.] 10 typ. EZJP1V120KM 7.5 12 330 max. [250 typ.] 290 typ. 一 20 EZJP1V180JM 11 18 220 max. [180 typ.] 210 typ. 20 EZJP1V220JM 13 22 220 max. [160 typ.] 185 typ. 10 EZJP1V270GM 18 27 100 max. [85 typ.] 100 typ. 10 EZJP1V270EM 18 27 47 max. [33 typ.] 37 typ. 5 EZJP1V270RM 18 27 20 max. [15 typ.] 16.5 typ. 2 EZJP1V330GM 25 33 100 max. [85 typ.] 100 typ. 10 EZJP1V420FM 30 42 68 max. [55 typ.] 63 typ. 8 EZJP1V650DM 40 65 27 max. [22 typ.] 33 typ. 2 EZJZ1V180JM 11 18 220 max. [180 typ.] 210 typ. 20 EZJZ1V220JM 13 22 220 max. [160 typ.] 185 typ. 20 EZJZ1V270GM 16 27 100 max. [85 typ.] 100 typ. 20 EZJZ1V330GM 26 33 100 max. [85 typ.] 100 typ. 20 EZJZ1V420FM 30 42 68 max. [55 typ.] 63 typ. 15 EZJZ1V650DM 40 65 27 max. [22 typ.] 33 typ. 5 0805 EZJZ2Y390KM 31 39 330 max. [210 typ.] 250 typ. 40 0402 0603 NEW Maximum Nominal varistor allowable voltage voltage at 1 mA (V) DC (V) 7.5 12 ● Operating temperature range : EZJP series　‒55 to 150 ℃，EZJZ series　‒55 to 125 ℃ Maximum ESD IEC61000-4-2 150 pF/ 330 Ω ISO10605 330 pF/ 2 kΩ Contact discharge 8 kV Contact discharge 25 kV ＊Recommend soldering method : Reflow soldering [term] Maximum allowable voltage Maximum DC Voltage that can be applied continuously within the operating temperature range Varistor voltage Varistor starting voltage between terminals at DC 1 mA, also known as Breakdown voltage Maximum peak current Maximum current that can be withstood under the standard pulse 8/20 µs，2 times based Maximum ESD Maximum voltage that can be withstood under ESD Design and specifications are each subject to change without notice. Ask factory for the current technical specifications before purchase and/or use. Should a safety concern arise regarding this product, please be sure to contact us immediately. 26-Jan-24 Multilayer Varistors (Automotive grade) EZJZ-M，EZJP-M series / Characteristics Varistor characteristics and equivalent circuit A Multilayer Varistor does not have an electrical polarity like zener diodes and is equivalent to total 3 pcs of 2 zener diodes and 1 capacitor. ［Equivalent Circuit］ Current (A) Zener diode Zener diode Voltage (V) Multilayer Capacitor 1 pcs monopolar 2 pcs Varistor ESD Suppressive effects Typical effects of ESD suppression Test conditions : ［ESD suppressed waveform］ 1400 ✽ IEC61000-4-2 Lvel 4 Contact discharge，8 kV 1200 Without Vvristor Attenuator : 60 dB 330 Ω 50 Ω 150 pF Oscillo-scope Voltage (V) 1000 Electrostatic discharger 800 EZJP0V270EM 600 [V1mA : 27 V, C1 MHz : 47 pF max.] 400 200 0 Multilayer -200 -20 varistors(MLCV) 0 20 40 60 80 100 120 140 160 180 200 Time (ns) ✽IEC61000-4-2 … International Standard of the ESD testing method (HBM) for electronic equipment ability to withstand ESD generated from a human body. It sets 4 levels of severity Severity Contact discharge Air discharge Level 1 2 kV 2 kV Level 2 4 kV 4 kV Level 3 6 kV 8 kV Level 4 8 kV 15 kV Replacement of zener diode Replacing “Zener diode and Capacitor” with Multilayer Varistor saves both the mounting area and number of components used. 1.7 0.3 0.5 Mounting area Approx 83 % 2.6 space saving 1.5 Zener diode MLCC MLCV SC-79 0402 Size(inch) 0402 Size(inch) Unit : mm Design and specifications are each subject to change without notice. Ask factory for the current technical specifications before purchase and/or use. Should a safety concern arise regarding this product, please be sure to contact us immediately. 26-Jan-24 Multilayer Varistors (Automotive grade) EZJZ-M，EZJP-M series / Performance and testing Performance and testing methods Characteristics Testing method Specifications Electrical characteristics shall be measured under the following conditions. Temp.：5 to 35 ℃，Relative humidity：85 % or less Standard test conditions Varistor voltage To meet the specified value. The Varistor voltage is the voltage (VC,or VcmA) between both end terminals of a Varistor when specified current (CmA) is applied to it. The measurement shall be made as quickly as possible to avoid heating effects. Maximum allowable voltage To meet the specified value. The maximum DC voltage that can be applied continuously to a varistor. Capacitance To meet the specified value. Capacitance shall be measured at the specified frequency, bias voltage 0 V，and measuring voltage 0.2 to 2.0 Vrms Maximum peak current To meet the specified value. The maximum current measured (Varistor voltage tolerance is within ±10 %) when a standard impulse current of 8/20 μ seconds is applied twice with an interval of 5 minutes. Maximum ESD To meet the specified value. The maximum ESD measured (while the varistor voltage is within blow ranges of its nominal value) when exposed to ESD 10 times (five times for each positive-negative polarity) based on IEC610004-2, ISO10605. EZJP□□□□□□M：within± 10 ％，EZJZ□□□□□□M ：within± 30 ％ The part shall be immersed into a soldering bath under the conditions below. Solder ：Sn-Ag-Cu Solder ability Resistance to soldering heat To meet the specified value. ΔVc/Vc : within ±10 % Soldering flux ：Ethanol solution of rosin (Concentration approx. 25 wt%) Soldering temp. ：230 ± 5 °C Period ：4 ± 1 s ：Immerse both terminal electrodes until they are completely into Soldering position the soldering bath. After the immersion, leave the part for 24 ±2 hours under the standard condition, then evaluate its characteristics. Soldering conditions are specified below: Soldering conditions ：270 ℃ , 3 s / 260 ℃ , 10 s ：Immerse both terminal electrodes until they are completely into Soldering position the soldering bath. After repeating the cycles stated below for specified number of times, leave the part for 24±2 hours, then evaluate its characteristics. Cycle : 2000 cycles Temperature cycling ΔVc/Vc : within ±10 % Temperature Step 1 Max. operating temp. Period 30±3 min 2 Ordinary temp. 3 min max. 3 Min. operating temp. 30±3 min 4 Ordinary temp. 3 min max. The varistor shall be soldered on the testing board shown. Vibration ΔVc/Vc : within ±10 % G force ：5 G Vibration frequency range ：10 to 2000 Hz Sweet time ：20 min. Sweet direction ：12 cycles for 3 courses perpendicular each other The varistor shall be soldered on the testing board shown. Mechanical shock Biased humidity ΔVc/Vc : within ±10 % ΔVc/Vc : within ±10 % Shock-wave formation ：Half sine , 11 ms G force ：50 G Sweet direction ：6 directions of X, Y, Z, for each three times After conducting the test under the conditions specified below, leave the part 24±2 hours, then evaluate its characteristics. Temp. ：85 ± 2 ℃ Humidity ：80 to 85 %RH Applied voltage ：Maximum allowable voltage (Individually specified) High temperature exposure (dry heat) ΔVc/Vc : within ±10 % Period ：2000+24/0 h After conducting the test under the conditions specified below, leave the part 24±2 hours, then evaluate its characteristics. Temp. ：Maximum operating temperature ±3 °C (Individually specified) Applied voltage ：Maximum allowable voltage (Individually specified) Period ：2000+24/0 h Design and specifications are each subject to change without notice. Ask factory for the current technical specifications before purchase and/or use. Should a safety concern arise regarding this product, please be sure to contact us immediately. 26-Jan-24 Multilayer Varistors (Automotive grade) EZJZ-M，EZJP-M series / Packaging Packaging methods (Taping) Size code (inch size) Thickness (mm) Kind of taping 0 (0402) 1 (0603) 0.5 0.8 2 (0805) 1.25 EZJZ, EZJP ● 2 mm Pitch (Punched carrier taping) Size 0402 Feeding hole t1 Pitch (mm) Quantity (pcs/reel) Punched carrier taping 2 10,000 Embossed carrier tape 4 　4,000 ● 4 mm Pitch (Punched carrier taping) Size 0603 Feeding hole t1 Chip pocket E øD0 A B B F W A Chip pocket øD0 E Series F W ● Standard quantity t2 Chip component P1 P2 P0 t2 Tape running direction Chip component P1 P2 P0 Tape running direction Unit : mm B Code A EZJZ EZJP ±0.05 0.62 W 1.12 ±0.05 8.0 ±0.2 F P1 E 3.50 ±0.05 1.75 ±0.10 2.00 ±0.05 P2 2.00 ±0.05 P0 4.0 ±0.1 øD0 t1 1.5 0.7 +0.1 0 Unit : mm t2 Code A 1.0 EZJZ EZJP ±0.1 max. max. ● 4 mm Pitch (Embossed carrier tape) Size 0805 1.8 ±0.1 W 8.0 ±0.2 F E 3.50 ±0.05 1.75 ±0.10 P1 4.0 ±0.1 P2 2.00 ±0.05 P0 4.0 ±0.1 øD0 1.5 +0.1 0 t1 t2 1.1 max. 1.4 max. Chip pocket K(10/20 pitch) øD0 W B B F øD1 E Feeding hole 1.0 B t’ t Code EZJZ A B 1.45 2.25 ±0.1 W ±0.1 8.0 ±0.2 F P1 E 3.50 ±0.05 1.75 ±0.10 4.0 ±0.1 P2 2.00 ±0.05 P0 4.0 ±0.1 øD0 t 1.5 1.42 +0.1 0 ● Reel for taping P0 P2 P1 A t ±0.1 t' 0.25 ±0.05 Tape running direction K 40.0 +0.15/ 10 pitch ● Leader part and taped end W1 Leader part E Cover tape B C 100 min. Vacant position 400 min. D W2 Tape end A Unit : mm Code EZJZ EZJP A ø180 B 0 -3 ø60.0 +1.0 　0 C 13.0±0.5 D 21.0±0.8 E 2.0±0.5 W1 9.0 +1.0 　0 W2 11.4±1.0 160 min. Vacant position Unit : mm ■ As for packaging methods, handling precautions please see data files Design and specifications are each subject to change without notice. Ask factory for the current technical specifications before purchase and/or use. Should a safety concern arise regarding this product, please be sure to contact us immediately. 26-Jan-24 Safety and Legal Matters to Be Observed Safety and Legal Matters to Be Observed 　Product specifications and applications ■ Please be advised that this product and product specifications are subject to change without notice for improvement purposes. Therefore, please request and confirm the latest delivery specifications that explain the specifications in detail before the final design, or purchase or use of the product, regardless of the application. In addition, do not use this product in any way that deviates from the contents of the company's delivery specifications. 　 ■ Unless otherwise specified in this catalog or the product specifications, this product is intended for use in general electronic equipment (AV products, home appliances, commercial equipment, office equipment, information and communication equipment, etc.). When this product is used for the following special cases, the specification document suited to each application shall be signed/sealed (with Panasonic and the user) in advance..These include applications requiring special quality and reliability, wherein their failures or malfunctions may directly threaten human life or cause harm to the human body (e.g.: space/aircraft equipment, transportation/traffic equipment, combustion equipment, medical equipment, disaster prevention/crime prevention equipment, safety equipment, etc.). 　 　Safety design and product evaluation ■ Please ensure safety through protection circuits, redundant circuits, etc., in the customer's system design so that a defect in our company's product will not endanger human life or cause other serious damage. ■ This catalog shows the quality and performance of individual parts. The durability of parts varies depending on the usage environment and conditions. Therefore, please ensure to evaluate and confirm the state of each part after it has been mounted in your product in the actual operating environment before use. If you have any doubts about the safety of this product, then please notify us immediately, and be sure to conduct a technical review including the above protection circuits and redundant circuits at your company. 　Laws / Regulations / Intellectual property ■ The transportation of dangerous goods as designated by UN numbers, UN classifications, etc., does not apply to this product. In addition, when exporting products, product specifications, and technical information described in this catalog, please comply with the laws and regulations of the countries to which the products are exported, especially those concerning security export control. ■ Each model of this product complies with the RoHS Directive (Restriction of the use of hazardous substances in electrical and electronic equipment) (2011/65/EU and (EU) 2015/863). The date of compliance with the RoHS Directive and REACH Regulation varies depending on the product model. Further, if you are using product models in stock and are not sure whether or not they comply with the RoHS Directive or REACH Regulation, please contact us by selecting "Sales Inquiry" from the inquiry form. ■ During the manufacturing process of this product and any of its components and materials to be used, Panasonic does not intentionally use ozone-depleting substances stipulated in the Montreal Protocol and specific bromine-based flame retardants such as PBBs (Poly-Brominated Biphenyls) / PBDEs (Poly-Brominated Diphenyl Ethers). In addition, the materials used in this product are all listed as existing chemical substances based on the Act on the Regulation of Manufacture and Evaluation of Chemical Substances. ■ With regard to the disposal of this product, please confirm the disposal method in each country and region where it is incorporated into your company's product and used. 　 ■ The technical information contained in this catalog is intended to show only typical operation and application circuit examples of this product. This catalog does not guarantee that such information does not infringe upon the intellectual property rights of Panasonic or any third party, nor imply that the license of such rights has been granted. Panasonic Industry will assume no liability whatsoever if the use of our company's products deviates from the contents of this catalog or does not comply with the precautions. Please be advised of these restrictions. 01-Dec-23 Matters to Be Observed When Using This Product Matters to Be Observed When Using This Product (Chip-type laminated varistor : Automotive grade) 　Safety measures ■ An in-vehicle chip-type laminated varistor (hereinafter “the product” or “the varistor”) is intended for use in general-purpose and standard applications, such as electrostatic control/noise suppression in in-vehicle equipment. The varistor may deteriorate in performance or fail (short or open mode) when used improperly. ■ If the varistor in short mode is used, applied voltage may cause a large current to flow through the varistor. Consequently, the varistor heats up and may burn the circuit board. An abnormal state of the varistor that results from a problem with its service conditions (use environment, design conditions, mounting conditions, etc.) may lead to, in a worst case scenario, burnout of the circuit board, serious accident, etc. Sufficiently check for what is described below before using the varistor. 　Use environments and cleaning conditions ■ This product (varistor) is not designed for use in the specific environments described below. Using the product in such specific environments or service conditions, therefore, may affect the performance of the product. Please check the performance and reliability of the product first and then use the product. (1) Used in liquid, such as water, oil, chemicals, and organic solvents. (2) Used in a place exposed to direct sunlight, an outdoor place with no shielding, or a dusty place. (3) Used in a place where the product is heavily exposed to sea breeze or a corrosive gas, such as Cl2, H2S, NH3, SO2, or NOX. (4) Used in an environment where electromagnetic waves and radiation are strong. (5) Located close to a heating component or a flammable material, such as a vinyl cable. (6) Sealed or coated with a resin, etc. (7) Solder flux of the soldered product is cleansed with a solvent, water, and a water-soluble cleaner (be careful with solder flux soluble to water). (8) Used in a place where dew concentrates on the product. (9) Used in a contaminated state. (Example) Touching a varistor (with uncovered skin) mounted on a printed board leaves sebum on the varistor. Do not handle the varistor in this manner. (10) Used in a place where excessive vibration or impact is applied to the product. ■ Use the varistor within the range of its specified ratings/capabilities. Using the varistor under severe service conditions that are beyond the specified ratings/capabilities causes degraded performance or destruction of the varistor, which may lead to scattering of varistor fragments, smoke generation, ignition, etc. Do not use the varistor at a working temperature or maximum allowable circuit voltage that exceeds the specified working temperature or maximum allowable circuit voltage. Do not locate the varistor close to combustible materials. ■ In an improper cleaning solution, with which the varistor is cleaned, flux residues or other foreign matter may stick to the surface of the varistor, which degrades the performance (insulation resistance, etc.) of the varistor. In a polluted cleaning solution, the concentration of free halogen, etc., is high, and may result in poor/insufficient cleaning. ■ Improper cleaning conditions (insufficient cleaning or excessive cleaning) may impair the performance of the varistor. (1) Insufficient cleaning (a) A halogenous substance in flux residues may corrode a metal element, such as a terminal electrode. (b) A halogenous substance in flux residues may stick to the surface of the varistor and lower its insulation resistance. (c) Tendencies described in (a) and (b) may be more notable with water-soluble flux than with rosin-based flux. Be careful about insufficient cleaning. (2) Excessive cleaning Ultrasonic waves that are too powerful from an ultrasonic cleaner cause the board to resonate, in which case the vibration of the board may cause the varistor or a soldered part to crack or reduce the strength of the terminal electrode. Keep power output from the ultrasonic cleaner at 20 W/L or lower, its ultrasonic frequency at 40 kHz or lower, and an ultrasonic cleaning time at 5 minutes or less. 30-Jun-23 Matters to Be Observed When Using This Product 　Response to anomalies and handling conditions ■ Do not apply excessive mechanical impact to the varistor. Because the varistor body is made of ceramic, drop impact to the varistor readily damages or cracks the varistor. Once dropped on the floor, etc., the varistor may have lost its sound quality and become failure-prone. Do not use said varistor. ■ When handling the board carrying the varistor, be careful not to let the varistor hit against another board. Take extra caution when handling or storing a stack of boards carrying varistors. There are cases where a corner of a board will hit against a varistor and damage or crack it, which may result in a failure of the varistor, such as a drop in its insulation resistance. Do not reuse a varistor that has been used on and removed from a board. Crack Mounting board Crack Floor 　Reliability A capacitor conforming to "AEC-Q200" refers to a capacitor having passed some or all of evaluation test items defined in AEC-Q200. To know the detailed specifications of each capacitor or specific evaluation test scores, please contact us. We issue a delivery specification sheet for each product ordered. Please confirm the delivery specification sheet when you place an order with us. 　Circuit design and circuit board design ■ A working temperature at which a varistor works in the circuit must be within the working temperature range specified in the specification sheet. A temperature at which a varistor incorporated in the circuit is kept in storage without operating must be within the storage temperature range specified in the specification sheet. Do not use the varistor at a higher temperature than the maximum working temperature. ■ Keep voltage applied across the terminals of the varistor equal to or lower than the maximum allowable circuit voltage. Applying improper voltage to the terminals may cause the varistor to fail or short-circuit thus generate heat. When using the varistor in a circuit where high-frequency voltage or pulse voltage of an acute waveform is applied consecutively, even if the applied voltage is lower than the rated voltage, confirm that the varistor is reliable enough to operate normally in the circuit. ■ Ensure that the surface temperature of the varistor, which includes a temperature increment resulting from self-heating, is equal to or lower than the highest working temperature specified in the delivery specification sheet. Check the temperature of the varistor under the circuit conditions used in the operation state of the device in which the varistor is incorporated. ■ Using the varistor on an alumina board has an expectation of performance degradation due to thermal impact (temperature cycle). Before using the varistor, sufficiently confirm that the board does not affect the quality of the varistor. 　Mounting conditions ■ The more solder deposited on the varistor, the greater the stress to the varistor, which leads to cracking of the varistor. When designing a land on the board, determine the shape and dimensions of the land so that a proper volume of solder is applied in the land. Design the land such that its left and right sides are equal in size. In a case where solder volumes are different between the left and right sides of the land, a greater volume of solder takes more time to cool and solidify. As a result, stress acts on one side which may crack the varistor. (a) Too much solder (b) Proper volume of solder (c) Too little solder 30-Jun-23 Matters to Be Observed When Using This Product Surface-mounted component c Land Solder resist Shape symbol Component dimensions (JIS size) L W T 0 (1005) 1.0 0.5 0.5 1 (1608) 1.6 0.8 0.8 a b c 0.4 to 0.5 0.8 to 1.0 0.4 to 0.5 0.6 to 0.8 0.4 to 0.5 0.6 to 0.8 Unit: mm b a ・ Use solder resist to evenly distribute solder volumes on the left and right sides. ・ When a component is located close to the varistor, the varistor is mounted together with a lead-attached component, or a chassis is located close to the varistor, separate solder patterns from each other using the solder resist. * Refer to cases to avoid and recommended examples shown on the right table. Items Mounting the varistor together with a lead-attached component Case recommended Case to avoid (Example of improving soldering by separating solder patterns) Lead of a leadattached component Solder resist Chassis Soldering in the vicinity of the chassis Soldering a lead-attached component later Placing the products side by side Solder resist Solder (earth solder) Electrode pattern Lead of a component mounted later Solder iron Solder resist Part where too much solder is applied Solder resist Land ・ When the board warps during or after soldering Case to avoid of the varistor to the board, the warping of the board may cause the varistor to crack. Place the varistor so that stress caused by the warp is negligible to the varistor. * Refer to the case to avoid and a case recommended example shown on the right table. Stress size ・ Mechanical stresses to the varistor near a breaking A>B=C>D>E line of the board vary depending on the mounting position of the varistor. Refer to the figure on the Perforated line right. ・ The varistor receives mechanical stresses different in size when the board is broken by different methods. The size of the stress the varistor receives is smaller in the following order: pushing back