Transient blocking units

4 August 2010 Circuit & System Protection

Bourns’latest series of transient blocking unit (TBU) circuit protection devices is designed to protect telecommunications applications from surges in what is claimed to be the industry’s first electronic current limiter triggered by excessive voltage or current. Designated the PL-series SLIC, the new circuit protection device family provides very fast over-current protection combined with SLIC battery voltage tracking triggered protection. Combined with additional overvoltage protectors, this new solution protects against very high surge levels and meets telecom 500A Telcordia GR-1089 intrabuilding and 6 kV/150 A ITU-T standards.

Protecting sensitive telecom applications from the potentially damaging effects of surges that can cause current and voltage to rise above normal operating levels, the PL-series responds in 100 nanoseconds. The resettable circuit protection devices also feature low let-through energy and overshoot protection, which reduces stress on the SLIC and the printed circuit board (PCB) for increased reliability and product life. The new TBU series also cuts the circuit protection component count to three devices, compared to the seven needed in a conventional gated thyristor solution, because there is no need for peripheral R-C or L-C components nor additional GDTs for increased surge requirements.

The PL-series is available in three voltages (850, 600 and 500) and two operating current levels (100 mA and 200 mA) that match worldwide standards and SLIC chipset requirements.

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