Absolute surge protection

25 April 2001 Circuit & System Protection

Sidactors are solid-state crowbar devices designed to protect telecom equipment during hazardous transient conditions. Capitalising on the latest in thyristor advancements, Teccor designs its Sidactors using a patented ion implant technology. The company says that this technology ensures effective protection within nanoseconds, 500 A surge current rating and simple regulatory requirements.

Operation

In standby mode, Sidactors exhibit a high off-state impedance eliminating excessive leakage currents and appearing transparent to the circuits they protect. Upon application of a voltage that exceeds the switching voltage, Sidactors will crowbar and simulate a short circuit condition until the current flowing through the device is either interrupted or drops below the Sidactor's holding current. Once this occurs the Sidactor will reset and return to its high off-state impedance.

Teccor says the advantage of using a Sidactor over other surge suppression devices is that the Sidactor offers absolute surge protection regardless of the surge current available. Unlike other devices, the Sidactor: cannot be damaged by voltage; is nondegenerative; will not fatigue; has negligible capacitance making it ideal for high speed transmission equipment; eliminates hysteresis and heat dissipation typically found with clamping devices.

Sidactor components can replace gas tubes, avalanche diodes and MOVs, providing advantages in speed, size and lower capacitance.

World Spectrum Sales

(011) 887 9111

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