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Fairchild releases app-specific, reverse polarity switches

Posted: 23 Aug 2012 ?? ?Print Version ?Bookmark and Share

Keywords:reverse polarity switches? overvoltage spikes? reverse transient?

Fairchild Semiconductor has introduced a new line of reverse polarity switches that are application specific and offers an optional overvoltage transient protection. The switches are intended shield electronic devices from damage brought about by overvoltage spikes due to improperly installed batteries, hot-plug transients, faulty connections and reversible third party USB chargers.

The devices also provide low resistance and nearly 50X less power consumption than a traditional series Schottky solution at 1Amp. The switches have been optimized for the application to provide a "plug and play" implementation solution, according to the company release.

Part of Fairchild's initial offering in the reverse polarity family are the FR011L5J low-side reverse polarity protector and the FR014H5JZ high-side reverse polarity protector with integrated overvoltage transient suppression (OVS). In the event of a reverse bias condition, both devices shut off power and provide a full voltage block to help protect downstream circuits.

Both protectors dissipate less than 0.02W during 1A normal operation, and less than 20?W in a 16V reverse bias event, a performance not possible with a diode solution. The low dissipation of the FR0XXX5J series minimizes the need for heat sinking and allows for smaller package sizes, reduced board space requirements and lowered component costs. Additionally, the devices' nSec scale reverse bias blocking response time blocks negative transients and other potentially damaging DC events. The FR014H5JZ and FR011L5J parts are both USB tested and compatible.

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