MARCH 1994 - REVISED MARCH 2006

Specifications are subject to change without notice.

Customers should verify actual device performance in their specific applications.

TISP3xxxF3 (HV) Overvoltage Protector Series

APPLICATIONS INFORMATION

Electrical Characteristics

depend on the junction temperature at the instant of measurement. The values given in this data sheet were measured on commercial

testers, which generally minimize the temperature rise caused by testing. Application values may be calculated from the parameters’

temperature coefficient, the power dissipated and the thermal response curve, Zθ (see M. J. Maytum, “Transient Suppressor Dynamic

Parameters.” TI Technical Journal, vol. 6, No. 4, pp. 63-70, July-August 1989).

Lightning Surge

Wave Shape Notation

Most lightning tests, used for equipment verification, specify a unidirectional sawtooth waveform which has an exponential rise and an

exponential decay. Wave shapes are classified in terms of peak amplitude (voltage or current), rise time and a decay time to 50 % of

the maximum amplitude. The notation used for the wave shape is amplitude, rise time/decay time. A 50 A, 5/310 µs wave shape would

wave shapes of commonly used surges.

Generators

There are three categories of surge generator type, single wave shape, combination wave shape and circuit defined. Single wave shape

generators have essentially the same wave shape for the open circuit voltage and short circuit current (e.g. 10/1000 µs open circuit

voltage and short circuit current). Combination generators have two wave shapes, one for the open circuit voltage and the other for the

short circuit current (e.g. 1.2/50 µs open circuit voltage and 8/20 µs short circuit current). Circuit specified generators usually equate to

a combination generator, although typically only the open circuit voltage waveshape is referenced (e.g. a 10/700 µs open circuit voltage

generator typically produces a 5/310 µs short circuit current). If the combination or circuit defined generators operate into a finite resis-

tance, the wave shape produced is intermediate between the open circuit and short circuit values.

Current Rating

As an example, the ITU-T K.21 1.5 kV, 10/700 µs open circuit voltage surge is changed to a 38 A, 5/310 µs current waveshape when

ITU-T K.21 waveform at 310 µs on the surge graph and not 700 µs. Some common short circuit equivalents are tabulated below:

Any series resistance in the protected equipment will reduce the peak circuit current to less than the generators’ short circuit value.

A 1 kV open circuit voltage, 100 A short circuit current generator has an effective output impedance of 10 Ω (1000/100). If the

100 A.

Standard

Open Circuit Voltage

Short Circuit Current

ITU-T K.21

1.5 kV, 10/700 µs

37.5 A, 5/310 µs

ITU-T K.20

1 kV, 10/700 µs

25 A, 5/310 µs

IEC 61000-4-5, combination wave generator

1.0 kV, 1.2/50 µs

500 A, 8/20 µs

Telcordia GR-1089-CORE

1.0 kV, 10/1000 µs

100 A, 10/1000 µs

Telcordia GR-1089-CORE

2.5 kV, 2/10 µs

500 A, 2/10 µs

FCC Part 68, Type A

1.5 kV, <10/>160 µs

200 A,<10/>160 µs

FCC Part 68,Type A

800 V, <10/>560 µs

100 A,<10/>160 µs

FCC Part 68, Type B

1.5 kV, 9/720 µs

37.5 A, 5/320 µs