SV250K23 datasheet(18/19 Pages) BOURNS

18 / 19 page

Term

Symbol

Definition

Rated AC Voltage .........................Vrms ..................Maximum continuous sinusoidal AC voltage (<5 % total harmonic distortion) which may be

applied to the component under continuous operation conditions at +25 °C

Rated DC Voltage.........................Vdc ....................Maximum continuous DC voltage (<5 % ripple) which may be applied to the component

under continuous operating conditions at +25 °C

Supply Voltage..............................V........................The voltage by which the system is designated and to which certain operating

characteristics of the system are referred; Vrms = 1.1 x V

Leakage Curreent.........................Idc......................The current passing through the varistor at Vdc and at +25 °C or at any other specified

temperature

Varistor Voltage ............................Vn......................Voltage across the varistor measured at a given reference current (In)

Reference Current........................In .......................Reference current = 1 mA DC

Clamping Voltage .........................Vc......................The peak voltage developed across the varistor under standard atmospheric conditions,

Protection Level

when passing an 8/20 µs class current pulse

Class Current................................Ic........................A peak value of current which is 1/10 of the maximum peak current for 100 pulses at two

per minute for the 8/20 µs pulse

Voltage Clamping Ratio................Vc/Vapp .............A figure of merit measure of the varistor clamping effectiveness as defined by the symbols

Vc/Vapp, where (Vapp = Vrms or Vdc)

Jump Start Transient ....................Vjump.................The jump start transient results from the temporary application of an overvoltage in excess

of the rated battery voltage. The circuit power supply may be subjected to a temporary

overvoltage condition due to the voltage regulation failing or it may be deliberately generated

when it becomes necessary to boost start the car.

Rated Single Pulse.......................Wmax.................Energy which may be dissipated for a single 10/1000 µs pulse of a maximum rated

Transient Energy

current, with rated AC voltage or rated DC voltage also applied, without causing device

failure

Load Dump Transient ...................WLD..................Load Dump is a transient which occurs in automotive environments. It is an exponentially

decaying positive voltage which occurs in the event of a battery disconnect while the alter-

nator is still generating charging current with other loads remaining on the alternator circuit

at the time of battery disconnect.

Rated Peak Single Pulse..............Imax...................Maximum peak current which may be applied for a single 8/20 µs pulse, with rated line

Transient Current

voltage also applied, without causing device failure

Rated Transient Average..............P........................Maximum average power which may be dissipated due to a group of pulses occurring

Power Dissipation

within a specified isolated time period, without causing device failure at 25 °C

Capacitance..................................C........................Capacitance between two terminals of the varistor measured @ 1 kHz

Non-linearity Exponent .................α........................A measure of varistor nonlinearity between two given operating currents, In and I1 as

described by I = k V exp(a), where:

- k is a device constant,

- I1 < I < In and

- a log (I1/In)/log(V1/Vn) = 1/log (V1/Vn), where:

- Ir is reference current (1 mA) and Vn is varistor voltage

- I1 = 10 In, V1 is the voltage measured at I1

Response Time.............................tr........................The time lag between application of a surge and varistor’s “turn-on” conduction action

Varistor Voltage Temperature .......TC .....................(Vn @ 85 °C - Vn @ 25 °C) / (Vn @ 25 °C) x 60 °C) x 100

Coefficient

Insulation Resistance ...................IR.......................Minimum resistance between shorted terminals and varistor surface

Isolation Voltage ......................................................The maximum peak voltage which may be applied under continuous operating conditions

between the varistor terminations and any conducting mounting surface

Operating Temperature..............................................The range of ambient temperature for which the varistor is designed to operate continuously

as defined by the temperature limits of its climatic category

Climatic Category .........................LCT/UCT/DHD..LCT & UCT = Lower and Upper Category Temperature - the minimum and maximum

ambient temperatures for which a varistor has been designed to operate continuously.

DHD = Dump Heat Test Duration

CDDFN5-0504N - TVS/Steering Diode Array

SV Series - Special Medium Voltage Varistors

Terrminology

Storage Temperature...............................................Storage temperature range without voltage applied

Current/Energy Derating..........................................Derating of maximum values when operated above UCT

REV. 01/21

Specifications are subject to change without notice.

Users should verify actual device performance in their specific applications.

The products described herein and this document are subject to specific legal disclaimers as set forth on the last page of this document, and at www.bourns.com/docs/legal/disclaimer.pdf.

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