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Telecom circuit protectors deliver bidirectional surge protection

Phoenix, Ariz. — ON Semiconductor has expanded its line of circuit protection solutions with the introduction of the NPxxx series of thyristor surge protection devices (TSPDs) for telecommunications applications. The NPxxx series, comprised of 44 devices, protect telecommunication circuits found in central office, access and customer-premises equipment from over-voltage conditions. Applications include modems, residential gateways, digital subscriber line access multiplexer (DSLAM), and integrated voice data (IVD) cards.

The NPxxx devices are high-surge current TSPDs offered in a range of protection voltages from 64 volts (V) to 350 V. They are available at surge current ratings of 50 amps, 80 amps and 100 amps. The devices limit voltage and divert surge current to ground. They are bidirectional, so they function as two devices in a single package, which saves space on board layout.

These devices are said to act as a “crowbar” when an over-voltage occurs — diverting potentially damaging energy away from the sensitive circuit or device. Once the transient over-voltage 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.

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. The NPxxxx devices are offered in a 5.40 x 3.5 mm DO-214AA surface-mount package and a 7.60 x 3.60 mm DO-15 axial lead package.

Pricing: $0.10 per unit in quantities of 10,000.
Product information: circuit protection devices and TSPDs

ON Semiconductor , 1-602-244-6600, www.onsemi.com

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