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Low-capacitance thyristors target next-gen telecom equipment

Posted: 15 Oct 2008 ?? ?Print Version ?Bookmark and Share

Keywords:thyristor protection device? telecom high speed? capacitance low?

NP0080, NP0120, NP0160

ON Semiconductor has released a new family of low capacitance thyristor surge protection devices (TSPD) designed for next generation of high speed telecom equipment. The new devices provide a superior balance of small size combined with high surge capabilities while maintaining low capacitance and low leakage, a suitable combination for leading edge telecom products.

Available in the space-saving TSOP-5 package, the NP0080, NP0120, and NP0160 low capacitance, low leakage devices protect DSL chipsets and line drivers. Though essentially transparent during normal circuit operation, they provide circuit protection during surge and ESD events. Their inherently low differential capacitance of less than 3picofarad (pF) across the operating voltage range precludes signal distortion on the high speed data line. The NP0xxx TSPDs also provide protection with a current withstand capability of greater than 50A during a 8?s x 20?s surge event. They are typically used as tertiary protection between the DSL isolation transformer and the DSL line driver in both access and customer premise equipment.

The new TSPD family also includes ultralow capacitance NP-MC series in a cost-effective SMB package. The ultralow capacitance of less than 30 pF for a 100A rated device offers designers an alternative to gas discharge tubes in a number of high speed applications. Due to their ultralow off-state capacitance, the NP-MC devices offer minimal signal distortion for high speed equipment such as VDSL2+ and T1/E1 circuits. The low nominal off-state capacitance translates into the extremely low differential capacitance offering superb linearity with applied voltage or frequency. 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.

Essential for development of reliable access and customer premise equipment such as Internet protocol digital subscriber line access multiplexer, home gateways and modems, VoIP and other equipment, these TSPDs assist the designer in achieving standards compliance, as well as minimizing any impact in signal quality.

The NP0080, NP0120 and NP0160 are packaged in TSOP-5 and priced at $0.2307 each in 3,000-unit quantities. The NP-MC series devices are available in the SMB package and priced at $0.2307 each in 2,500-unit quantities.

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