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The BCR405UW6 monolithically integrates a transistor, diodes and resistors to function as a Constant Current Regulator (CCR) for LED driving. The device regulates with a preset 50mA nominal that can be adjusted with external resistor up to 65mA. It is designed for driving 0.25W LEDs in strings and will reduce current at increasing temperatures to self-protect. Operating as a series linear CCR for LED string current control it can be used in applications with supply voltages up to 40V.

With no need for additional external components, this CCR is fully integrated into a SOT26 minimizing PCB area and component count.


  • Constant current regulation (CCR) in:
    • Emergency lighting
    • Signage, advertising, decorative and architectural lighting
    • Retail lighting in fridge, freezer case and vending machines


  • LED Constant Current Regulator Using PNP Emitter-Follower with Emitter Resistor to Current Limit
  • IOUT = 50mA ± 10% constant current (Preset)
  • IOUT up to 65mA adjustable with an external resistor
  • VOUT = 40V Supply Voltage
  • PD up to 750mW in SOT26
  • Negative temperature coefficient (NTC) reduces Iout with increasing temperature
  • Parallel devices to increase regulated current

Product Specifications

Product Parameters

Qualified to AECQ10x Yes
Automotive Compliant PPAP BCR405UW6Q
Topology Linear LED Driver
Minimum Supply Voltage 1.4 V
Maximum Supply Voltage 40 V
Maximum VOUT 40 V
Number of Channels 1
LED Current Sense Voltage 700 mV
Output Current 100 mA
LED Current Preset mA
Accuracy 10 %
Dimming PWM by external transistor
Temperature Range -55 to 150 °C

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Orderable Part Number Authorized Distributor Quantity Inventory Date Buy Online Region
BCR405UW6-7 Mouser Electronics Inc. 60 8/3/2020 Buy Now United States
BCR405UW6-7 Digi-Key Electronics 3000 8/2/2020 Buy Now United States
BCR405UW6Q-7 Arrow Electronics Central EU 3000 8/3/2020 Buy Now Germany
BCR405UW6Q-7 Mouser Electronics Inc. 2290 8/3/2020 Buy Now United States
BCR405UW6Q-7 Digi-Key Electronics 3513 8/2/2020 Buy Now United States