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These low voltage symmetrical transient voltage suppressor devices are designed to protect two wire telecommunication applications against transients caused by lightning strikes and a.c. power lines. Offered in two voltage variants to meet battery and protection requirements they are guaranteed to suppress and withstand the listed international lightning surges in both polarities.
Transients are initially clipped by breakdown clamping until the voltage rises to the breakover level, which causes the device to crowbar. The high crowbar holding current prevents d.c. latchup as the current subsides.
These monolithic protection devices are fabricated in ion-implanted planar structures to ensure precise and matched breakover control and are virtually transparent to the system in normal operation.
The small-outline 8-pin assignment has been carefully chosen for the TISP series to maximise the inter-pin clearance and creepage distances which are used by standards (e.g. IEC950) to establish voltage withstand ratings.
TISP4082F3 Maximum Ratings
RATING
SYMBOL
VALUE
UNIT
Repetitive peak off-state voltage (0°C <TJ < 70°C)
'4072F3 '4082F3
VDRM
± 58 ± 66
V
Non-repetitive peak on-state pulse current (see Notes 1, 2 and 3) 1/2 µs (Gas tube differential transient, open-circuit voltage wave shape 1/2 µs) 2/10 µs (FCC Part 68, open-circuit voltage wave shape 2/10 µs) 8/20 µs (ANSI C62.41, open-circuit voltage wave shape 1.2/50 µs) 10/160 µs (FCC Part 68, open-circuit voltage wave shape 10/160 µs) 5/200 µs (VDE 0433, open-circuit voltage wave shape 2 kV, 10/700 µs) 0.2/310 µs (RLM 88, open-circuit voltage wave shape 1.5 kV, 0.5/700 µs) 5/310 µs (CCITT IX K17/K20, open-circuit voltage wave shape 2 kV, 10/700 µs) 5/310 µs (FTZ R12, open-circuit voltage wave shape 2 kV, 10/700 µs) 10/560 µs (FCC Part 68, open-circuit voltage wave shape 10/560 µs) 10/1000 µs (REA PE-60, open-circuit voltage wave shape 10/1000 µs)
ITSP
120 80 70 60 50 38 50 50 45 35
A
Non-repetitive peak on-state current (see Notes 2 and 3) 50 Hz, 1 s
D Package
ITSM
4
A rms
SL Package
6
Initial rate of rise of on-state current, Linear current ramp, Maximum ramp value < 38 A