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10mA-150mA, Adjustable, SOT26

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

The BCR420U monolithically integrates transistors, diodes and resistors to function as a Constant Current Regulator (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 no need for additional external components, this CCR is fully integrated into an SOT26 minimizing PCB area and component count.


  • 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
  • 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


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

Product Specifications

Product Parameters

AEC Qualified Yes
Compliance (Only Automotive supports PPAP) Automotive
Topology Linear LED Driver
Minimum Supply Voltage (V) 1.4 V
Maximum Supply Voltage (V) 40 V
Maximum VOUT (V) 40 V
Number of Channels 1
LED Current Sense Voltage (mV) 700 mV
Output Current (A) 350 mA
Channel Max. Output Current (mA) 10 Preset mA
Accuracy (%) 10 %
Dimming PWM by external transistor
Temperature Range (°C) -55 to 150 °C

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Product Change Notices (PCNs)

A PCN may only apply to specific orderable part numbers in this datasheet. Please refer to the corresponding PCN to see the exact orderable part number(s) affected.

PCN # Issue Date Implementation Date Subject
PCN-2485 2020-12-04 2021-03-04 Qualification of Internal "Diodes Technology (Cheng Du) Company Limited" (CAT) as Additional Assembly & Test Site Using PdCu or Au Bond Wire, And Qualification of Additional Wafer Source for Select Discrete Automotive Products