Surge Suppression Devices Help Protect High Data Rate Telecom and Datacom Equipment

Compliant with major standards such as GR-1089 Core, ITU K.20/K.21, IEC61000-4-5, FCC part 68, and UL60950, the new SiBar thyristors provide fast, bi-directional protection in industry standard surge current families of 50A, 80A and 100A (10/1000µs).

Key device parameters include voltage ranges from 6V to 400V, capacitance values as low as 12pF, maximum leakage current of only 2µA and a minimum hold current of 150mA. The devices are housed in surface-mount SMB (JEDEC DO-214AA) and SMA (JEDEC DO-214AC) package options.

SiBar thyristors help protect sensitive telecom and datacom equipment from damage resulting from overvoltage events, including lightning transients, and 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. The SiBar device remains in this low-impedance state until the current through the device is decreased below its hold rating. After an overvoltage event has passed, it resets to its high-impedance state and allows for normal system operation.

In addition to resettable functionality, SiBar devices offer a small form factor, low on-state power dissipation, and accurate foldback voltage shunting. The new low-capacitance offering also makes these devices suitable for high data rate circuits.

Helpful in protecting communications network equipment, including analog and digital linecards, xDSL and ISDN modems, set-top boxes, T1 equipment and Voice over IP (VoIP) equipment, the RoHS-compliant devices are compatible with lead-free solders and high-volume assembly processes.