The NUD4700 is an electronic shunt which provides a current bypass

in the case of a single LED going into open circuit. LEDs are by nature

quite fragile when subjected to transients and surge conditions. There

are also many cases where high reliability of the LED lighting must be

maintained such as headlights, lighthouses, bridges, aircraft, runways

and so forth. In these cases the low cost addition of the NUD4700 will

provide full assurance that an entire string of LEDs will not extinguish

should one LED fail. NUD4700 is also applicable to other loads where

circuit continuity is required. This device is designed to be used with

1 W LEDs (nominally 350 mA @ 3 V).

Features

• A Simple Two Terminal Device

• Automatically Resets Itself if the LED Heals Itself or is Replaced

• ON−State Voltage Typically 1 V

• OFF−State Current less than 250 A

• Available with White Package

• SZ Prefix (black package only) for Automotive and Other

Applications Requiring Unique Site and Control Change

Requirements; AEC−Q101 Qualified and PPAP Capable

• These Devices are Pb−Free, Halogen Free/BFR Free and are RoHS

Compliant

Typical Applications

• LEDs where Preventive Maintenance is Non Practical

• LED Headlights

• LEDs with High Reliability Requirements

• Crowbar Protection for Open Circuit Conditions

• Overvoltage Protection for Sensitive Circuits