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Thyristor offers 45% lower capacitance than clamping devices

Posted: 22 Aug 2013 ?? ?Print Version ?Bookmark and Share

Keywords:protection thyristor? clamping devices? broadband?

Littelfuse Inc. has announced an ultra-low capacitance protection thyristor in the SOT23-6 package that claims to provide robust over-voltage protection for broadband/xDSL telecommunications equipment with minimal effects on connection speed and reach. The SDP Series SIDACtor Protection Thyristor features patent-pending silicon crowbar technology that allows for 45 per cent lower capacitance than clamping devices such as transient voltage suppressor (TVS) diodes, stated the company.

According to Littelfuse, the device provides faster response to surges, ensuring lower overshoot voltages and improved electrostatic discharge (ESD), lightning and power fault protection. It is designed for the tertiary or line driver side protection position in VDSL2, ADSL2, ADSL2+ telecommunications applications and general I/O protection functions. Its small-footprint package is geared for high density card designs.

Crowbar devices operate as shunt devices in response to a surge that exceeds the breakover voltage. After switching on, they offer a very low impedance path that diverts transient energy away from the load. In contrast, clamping devices limit the transient voltage to a set value. When the applied voltage reaches the device's breakdown value, it switches to a much lower resistance value to minimise the transient energy the circuit will experience.

The protection thyristor helps prevent xDSL driver chip failures by providing a crowbar response to surge events with a maximum threshold of 29V at 250V/?s. It also provides robust surge protection performance up to 30A while maintaining low off-state capacitance for better AC protection, and responds quickly to surges, preventing damage caused by the coupling of transient events across the small signal transformer.

SDP SOT23-6 SIDACtor Protection Thyristors are available on reels in quantities of 3,000. Samples are available for bulk orders. Sample requests can be placed through authorised Littelfuse distributors worldwide.

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