SiBar thyristor surge protection devices  help protect sensitive telecom and datacom euipment from damage caused by overvoltage events, including lightning transients. The devices operate as shunt devices in response to a surge that exceeds the breakover voltage. When the voltage exceeds the breakover voltage, the SiBar device "folds back," creating a low-impedance path, effectively shorting out the overvoltage condition.
Compliant with major standards such as GR-1089 Core, ITU-T-K20/K21, IEC61000-4-5 and FCC part 68, and UL1950, SiBar devices provide fast, bi-directional protection on communications network equipment, including analog and digital linecards, xDSL and ISDN modems, set-top boxes, T1 equipment, Voice over IP (VoIP) and Power over Ethernet (PoE) equipment.
The SiBar thyristor's low on-state voltage allows for smaller form factor devices - as compared with clamping devices of comparable energy handling capability, and their relatively low capacticance makes them suitable for high data rate circuits.
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