Standard D Series 7mm Disc 07D271K 271 270V Zinc Oxide Metal Oxide Varistor 175VAC 225VDC Voltage Dependent Resistor

Standard D Series 7mm Disc 07D271K 271 270V Zinc Oxide Metal Oxide Varistor 175VAC 225VDC Voltage Dependent Resistor

Characteristics

High performance transient voltage suppression
Short response time to surge voltage
Low standby power dissipation
Excellent clamping characteristics
High performance withstanding surgecurrents
High reliability
UL, CSA, VDE and SEV recognized

Part Numbering

Dimension (mm)

Thickness Tmax.

Applications

Surge protection in:

consumer electronics

industrial electronics

communication electronics

measuring and controlling systems

electronic home appliances

Protection against surges induced by lighting striking incoming power lines.

Suppression of surges caused by switching inductive loads such as transformers, relays and coils. Protection of rectification diodes, SCRs, power transistors, semiconductor devices, etc.

Definition of Varistor Terms

Rated RMS Voltage, Rated DC Voltage:

The maximum designated values of power system voltage that may be applied continuously between the terminals of a device.

Varistor Voltage: Test characteristic that is used to classify varistors by type. A test current of 1mA DC is typically used to determine varistor voltage classification type. Varistor voltage clamping characteristics can be defined at various test levels.

Rated Peak Single Pulse Transient Current: Maximum surge current, 8/20μs waveform which a varistor is rated to withstand for a single surge.

Rated Single Pulse Transient Energy: Maximum allowable energy for a single impulse (see specified waveforms).

Maximum Clamping Voltage: Measured peak voltage across the device terminals when a current impulse of specified amplitude and waveform is conducted through the varistor.

Typical Capacitance: Typical capacitance values are measured at a test frequency of 1kHz. Capacitance values are only for reference purpose only, not subject to outgoing inspection.

General Characteristics

Storage Temperature: －55℃ to ＋125℃

Operating Surface Temperature: 125℃

Operating Ambient Temperature: －55℃ to ＋85℃(without derating)

Maximum Voltage-Temperature Coefficient:＜－0.05﹪∕℃

Insulation Resistance: 1000 Mega-ohm minimum

Hi Pot (Leads To Case, 1 Min.) : 2500 VDC

Typical Response Time: ＜15 Nano-seconds

Epoxy Rating: 94V-0

Current∕Energy Derating (＞85℃ ): －2.5 ﹪∕℃ DC

Leakage Current: 200µA maximum (at rated DC working voltage )

Solder ability: MIL-STD-202F

Power Dissipation Ratings(P, in-watts): All definitions are according to IEEE specifications C62.33.

Varistor Lead Cutting Offer

A: 4.0 ±1.0mm(Crimped lead cutting for 5D, 7D)

B: 3.0 ±1.0mm(Crimped lead cutting for all diameter size)

C: 4.5 ±1.5mm(Crimped lead cutting for 10D, 14D)

D: 6.5 ±1.0mm(Crimped lead cutting for all diameter size)

E: 4.0 ±1.0mm(Straight lead cutting for 5D, 7D, 10D, 14D, 20D)

F: 5.0 ±1.0mm(Crimped lead cutting for 10D, 14D)

J: 3.0 ±0.5mm K: 3.5 ±1.0mm

Peak Current Per Pulse Versus Pulse Duration

Energy Derating Versus Temperature

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