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Powerful phase control thyristors

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THE new Powerex TCS4_340H disc-pack, phase control thyristors from Westek Electronics are characterised by extremely low peak on-state voltage (<1.34 volts), high current rating of 3400 amps with 50 Hz peak single cycle surge current as high as 56.5 kA, high current slew rates (di/dtcrit of 300 amps/microsecond) and voltage slew rates (dv/dtcrit of 1000 volts/microsecond) as well as excellent surge and let-through (I2t) ratings.

Turn on delay time is typically 2.5 microseconds and turn-off delay is typically 400 microseconds. The Powerex thyristors are available in four voltage ratings (peak off state/peak reverse) of 2200, 2400, 2600, and 2800 volts.

Operating junction temperature range is from -40°C to +125°C and the thermal transfer impedance characteristics of the package permit relatively small derating even at 180 angular degrees conduction.

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