Stay lit with open LED protectors

4th May 2017

Alice Matthews

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Datasheet

A range of open LED protectors has been introduced by Littelfuse, the PLEDxN series. These surface mount devices, which are designed for use with high-brightness, 1W LEDs with a nominal 350mA current at 3V, provide a switching electronic shunt path when an LED in an LED string or array fails as an open circuit. They are designed to reset automatically if the LED heals itself or the power is cycled.

The company claims that their small-footprint SOD-123FL package housing has one of the lowest height profiles (1.1mm) of any device of this type, making it suitable for dense board applications that demand high layout flexibility.

Typical applications for PLEDxN series of open LED protectors include street, subway, runway, and tunnel lighting, as well as headlights, roadside warning lights, and outdoor signage where high reliability and low maintenance are required.

“When compared with other open LED protection solutions such as Silicon Controlled Rectifiers (SCRs) and Zener diodes, the PLEDxN series enables higher reliability and lower maintenance,” said Meng Wang, Product Manager, open LED protectors at Littelfuse. “That makes them ideal for applications like outdoor LED lighting or signage applications where durability is essential.”

PLEDxN series open LED protectors offer these key benefits:

Electronic shunt/bypass for open LEDs allows LED strings or arrays to continue to function even if one LED fails as an open circuit.
The small-footprint SOD-123FL package provides high layout flexibility, making them suitable for dense board applications.
Device resets automatically if the LED heals itself or is replaced, resulting in lower maintenance and higher reliability.