Surge protection for telecoms

14 October 2008

A range of surge protection devices has been introduced for high-speed telecom equipment.

The TSPD (Thyristor Surge Protection Devices) from ON Semiconductor have been designed for the next generation of high speed telecom equipment, and promise high surge capabilities whilst maintaining low capacitance and low leakage.

Available in a TSOP-5 package, the NP0080, NP0120, and NP0160 devices protect DSL chipsets and line drivers. Their inherently low differential capacitance of less than 3pF (picofarad) across the operating voltage range precludes signal distortion on the high-speed data line. These NP0-series TSPDs can withstand current capability greater than 50A and are typically used as tertiary protection between the DSL isolation transformer and the DSL line driver in Access and Customer Premise Equipment. These TSPDs also claim to assist designers of Internet Protocol Digital Subscriber Line Access Multiplexer (IP-DSLAM), home gateways and modems, VoIP and other equipment.

The TSPD range from ON Semiconductor also includes the NP-MC series in a SMB package. The ultra low capacitance of less than 30pF for a 100A rated device offers designers an alternative to Gas Discharge Tubes in a number of high speed applications. Due to their off-state capacitance, the NP-MC devices claim to offer minimal signal distortion for high-speed equipment such as VDSL2+ and T1/E1 circuits. According to the company, they are typically used as secondary protectors on the line-side of the DSL isolation transformer. The NPMC series includes the NP0640SCMCT3G, NP0720SCMCT3G, NP0900SCMCT3G, NP1100SCMCT3G, NP1300SCMCT3G and NP1500SCMCT3G.

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