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Diodes Pericom: A product line of Diodes Incorporated


This Linear LED driver is designed to meet the stringent requirements of automotive applications.

The BCR421UW6Q monolithically integrates transistors, diodes and resistors to function as a Constant Current Regulators (CCR) for linear LED driving. The device regulates with a preset 10mA nominal that can be adjusted with an external resistor up to 350mA. It is designed for driving 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 multiple applications, as long as the maximum supply voltage to the device is < 40V.

With the low-side control, the BCR421UW6Q has an Enable (EN) Pin which can be pulse-width modulated (PWM) up to 10 kHz by a microcontroller for LED dimming.

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


  • Constant Current Regulation (CCR) in:
    • Automotive Interior Lighting
    • Mood and Decorative Lighting


  • LED Constant Current Regulator using NPN Emitter-Follower with Emitter Resistor to Current Limit
  • IOUT – 10mA ± 10% Constant Current (Preset)
  • IOUT up to 350mA Adjustable with an External Resistor
  • VOUT – 40V Supply Voltage
  • PD up to 1W in SOT26 (SC-74)
  • Low-Side Control Enabling PWM Input < 10kHz
  • Negative Temperature Coefficient (NTC) Reduces IOUT with Increasing Temperature
  • Parallel Devices to Increase Regulated Current
  • Totally Lead-Free & Fully RoHS Compliant
  • Halogen and Antimony Free. “Green” Device
  • Qualified to AEC-Q101 Standards for High Reliability
  • PPAP Capable

Product Specifications

Product Parameters

Qualified to AECQ10x Yes
Automotive Compliant PPAP Yes
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 350 mA
LED Current 10 Preset mA
Accuracy 10 %
Dimming PWM
Temperature Range -55 to 150 °C

Quality & Reliability

Technical Documents



Recommended Soldering Techniques
Orderable Part Number Authorized Distributor Quantity Inventory Date Buy Online Region
BCR421UW6Q-7 Arrow Electronics 1400 6/24/2019 Buy Now Americas
BCR421UW6Q-7 Digi-Key Electronics 98558 6/24/2019 Buy Now Americas
BCR421UW6Q-7 Future Electronics 6000 6/24/2019 Buy Now Americas
BCR421UW6Q-7 Mouser Electronics Inc. 18336 6/24/2019 Buy Now Americas