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Thyristor crowbars slay telecom surges

Posted: 19 Nov 2007 ?? ?Print Version ?Bookmark and Share

Keywords:thyristor surge protection devices? telecommunications circuits?

ON Semiconductor has introduces a series of thyristor surge protection devices (TSPDs)

for surge protection of telecommunication circuits found in modems, residential gateways, and central office access equipment.

The NPxxx series consists of 44 high surge current TSPDs designed to protect telecommunication circuits found in central office, access and customer-premises equipment from over voltage conditions ranging from 64-350V. They are available at surge current ratings of 50A, 80A and 100A.

Used as part of the secondary protection circuit, these devices provide overvoltage protection acting as a crowbar when an overvoltage occursdiverting potentially damaging energy away from the sensitive circuit or device to ground. Once the transient overvoltage has passed, these devices return to their normal "off" or transparent state, and appear invisible to the normal operation of the circuit. With no wearout characteristics, these TSPDs feature stable performance characteristics under fast transient conditions for reliable and continued equipment operation. They are bidirectional, so they are able to have functionality of two devices in a single package. This saves valuable space on board layout.

The NPxxx devices are UL497A certified, and implementation into electronics applications assists in meeting various regulatory requirements including GR-1089-CORE, ITU K.20/K.21/K.45, IEC 61000-4-5, IEC 60950, YD/T 993, YD/T 950, YD/T 1082. They are available in DO-214AA surface mount packages and in DO-15 axial leaded packages.

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