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ECL protects telecom apps from power surges

Posted: 09 Jul 2010 ?? ?Print Version ?Bookmark and Share

Keywords:electronic current limiter? transient blocking unit? power surge?


From Bourns Inc. comes the TBU PL-Series subscriber line interface circuit (SLIC) from, its latest series of transient blocking unit (TBU) circuit protection devices. Claimed to be the first electronic current limiter (ECL) triggered by excessive voltage or current, the devices are designed to protect telecommunications applications from surges.

The new circuit protection device family provides extremely fast overcurrent 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 6kV/150A ITU-T standards.

The Bourns TBU PL-Series responds in 100ns. The resettable circuit protection devices feature significantly lower let-thru energy and overshoot protection, which reduces stress on the SLIC and the PCB for increased reliability and product life.

Because there is no need for peripheral R-C or L-C components nor additional GDTs for increased surge requirements, Bourns' new TBU series cuts the circuit protection component count to three devices compared to the seven needed in a conventional gated thyristor solution. Thus, the TBU package size is 25 percent smaller than the Bourns P-G TBU series.

The Bourns TBU PL-Series is available in three voltages (850-, 600- and 500V) and two operating current levels (100- and 200mA) that match worldwide standards and SLIC chipset requirements. Product samples, evaluation boards and sample kits are available now through Bourns' distribution partners. As a pricing example, Bourns TBU-PL050-100-WH is priced at $.056 each in 3,000 quantities.

- Toni McConnel

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