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Littelfuse PLED Series is a voltage triggered electronic shunt device that provides a current bypass in the case of a single LED failing into an open circuit condition. When any single LED fails as an open circuit, PLED devices ensure that other LEDs within the string continue to function. PLED devices also protect against ESD (electrostatic discharge) and lightning surge effects. Designed to serve the needs of high brightness outdoor LED lighting applications (advertising and traffic signs, roadway/pathway/runway lighting, aircraft and emergency lighting, etc), PLED devices help assure reliability and lower maintenance requirements. Littelfuse Delivers High Reliability, Low Maintenance, and Long-Term of LED Lighting ProductsBelow is an INTERACTIVE circuit diagram, CLICK the 5 green Application Solution links to see the product options to help you deliver the full benefits to your LED lighting solutions. 
AC Line Fuse SolutionsLittelfuse has a broad selection of AC fuse design solutions, here are just a few offered. 2AG – Cartridge FusesPicoII® Axial Fuses 5X20MM – Cartridge and Axial Fuses NANO2 SMD Brick Fuses and Fuse Holders 
Left: Pico II Fuses, Right: NANO2 Fuses TVS Diode & Varistors (TMOV Series)TMOV® Varistors and High Power TVS Diodes AC Overvoltage Protection Solution Littelfuse thermally protected Metal Oxide Varistors(TMOVs) and high power TVS Diode range offer great AC overvoltage protection alternatives TVS DiodesTMOV Varistors HV DC FuseHigh Voltage DC Line Fuse Solutions Littelfuse has designed high voltage fuses to provide protection for high energy applications. 477 Series - 5X20MM 500VAC/400VDC Fuse505 Series - 6X32MM 500VAC/500VDC Fuse
TVS DiodesDC Overvoltage protection solution Transient Voltage Suppressors designed to protect circuits from damaging voltage surges. TVS Diodes
PLED SeriesOpen LED protection device provides an electronic switching shunt for LED arrays. The new Littelfuse PLED Series provides added reliability to LED lighting designs by minimizing the impact due to the loss of a single LED in a series string of LEDs. 
PLED Series–SMD LED protection device View PLED Product Training Module(PTM) The light-emitting-diode (LED) lighting market is growing quickly, thanks in part to benefits of energy efficiency, long term life and durability, and low maintenance expectations. A new problem that lighting system designers, product manufacturers, and end users are recognizing that, just like all electronics, LED strings and power sources are susceptible to damage by transient voltage, surges, and other electrical threats. Particularly with outdoor applications, a common cause of LED failure is electrostatic-discharge (ESD) induced by nearby lightning strikes. Because these LEDs are used in traffic control and lighting, safety, and other critical use applications, failure is not an option. PLED (Open LED Protector Series) The new Littelfuse PLED Series provides added reliability to LED lighting designs by minimizing the impact due to the loss of a single LED in a series string of LEDs. LED Protector - The open LED protector device (PLEDx) provides an electronic switching shunt path when a single or even multiple LEDs in the lighting string fails open. This insures the functionality of the remaining lighting array, thus providing for highly reliable lighting functions for applications such as roadside warning lights, streets lights, headlights, aircraft runways, etc. This PLED device is compatible with one, two, and three watt LEDs. It is available in two different surface mount packages, the standard DO-214AA and the Quad Flat Pak No-Lead (QFN). The QFN’s low profile, chip scale package (CPS) is ideal for dense board applications. Features of PLED (Open LED Protector)
What are PLED devices, and how do they compare?Littelfuse PLED open-LED protection devices are often incorporated into the circuit designs of high-power LEDs in applications such as roadway lights and outdoor LED advertising display signs. PLED devices are connected in parallel with each LED in a series string. If one LED should fail open-circuit, then the PLED connected to it will turn on and carry the current that would have gone through the failed LED. This keeps the rest of the string operating, and only a single LED goes dark instead of the whole string. In the off state, a PLED draws only a few microamps, and thus, it does not affect the circuit. When triggered, it carries the full current of the string with a voltage drop of about 1.3 volts. The PLED device helps protect the LED from surges induced by nearby lightning strikes and ESD events. In addition, the PLED contains reverse current diodes that will protect the LED string if the power supply is connected with reverse polarity. PLED devices are typically connected across each LED in a string. However, units are available to connect across two or even three LEDs. While this reduces the cost of protection, it does cause more than one LED to go dark if one fails. How do they compare to other circuit protection technologies?
Why do I need to use LED protectors LEDs are often designed to connect in strings of five to twenty in series. Often the failure of any single LED will take out an entire string. In street light or airport runway light applications, the loss of the string may dim or shut down the light, creating a safety hazard. In outdoor LED display advertising signs, it may produce blank spots and result in lost revenue. In any case, the failure of an LED string is often a costly maintenance issue in outdoor applications. Buy NowPLED
*POWERMITE® is a registered trademark of Microsemi Corporation.
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