BCR420UW6Q / BCR421UW6Q
LINEAR LED CONSTANT CURRENT REGULATOR IN SOT26
Description
Features
The BCR420UW6Q and BCR421UW6Q are linear LED drivers that
are designed to meet the stringent requirements of automotive
applications.
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
(BCR421UW6Q)
These devices monolithically integrate transistors, diodes, and
resistors to function as a Constant Current Regulator (CCR) for linear
LED driving. Each 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, the device can be used in multiple
applications, as long as the maximum supply voltage to the device is
< 40V.
VOUT – 40V Supply Voltage
PD up to 1W in SOT26
Low-Side Control Enabling PWM Input < 25kHz (BCR421UW6Q)
Negative Temperature Coefficient (NTC) Reduces IOUT with
Increasing Temperature
Parallel Devices to Increase Regulated Current
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
The BCR420UW6Q and BCR420UW6Q are suitable for
automotive applications requiring specific change control;
these parts are AEC-Q100 qualified, PPAP capable, and
manufactured in IATF16949 certified facilities.
https://www.diodes.com/quality/product-definitions/
With low-side control, the BCR421UW6Q has an Enable (EN) pin
which can be pulse-width modulated (PWM) up to 25kHz by a micro-
controller for LED dimming.
With no need for additional external components, this CCR is fully
integrated into the SOT26 package, minimizing PCB area and
component count.
Mechanical Data
Package: SOT26
Applications
Package Material: Molded Plastic. “Green” Molding Compound.
UL Flammability Rating 94V-0
Constant Current Regulation (CCR) in:
Moisture Sensitivity: Level 1 per J-STD-020
Terminals: Finish - Matte Tin Plated Leads.
Solderable per MIL-STD-202, Method 208
Weight: 0.018 grams (Approximate)
Automotive interior lighting
Mood and decorative lighting
SOT26
EN
OUT
Pin Name
Pin Function
EN
REXT
OUT
GND
OUT
Regulated Output Current
Enable for Biasing
Transistor
OUT
OUT
EN
R
EXT
(Optional)
External Resistor for
Adjusting Output Current
REXT
GND
Power Ground
GND
Top View
Pin-Out
Top View
Internal Device
Schematic
Ordering Information (Note 4)
Packing
Orderable Part Number
Marking
420
Reel Size (inches)
Tape Width (mm)
Quantity
3,000
3,000
Carrier
Reel
Reel
BCR420UW6Q-7
BCR421UW6Q-7
7
7
8
8
421
Notes:
1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS), 2011/65/EU (RoHS 2) & 2015/863/EU (RoHS 3) compliant.
2. See https://www.diodes.com/quality/lead-free/ for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green" and
Lead-free.
3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and
<1000ppm antimony compounds.
4. For packaging details, go to our website at https://www.diodes.com/design/support/packaging/diodes-packaging/.
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www.diodes.com
July 2023
BCR420UW6Q / BCR421UW6Q
© 2023 Copyright Diodes Incorporated. All Rights Reserved.
Document number: DS38302 Rev. 6 - 2
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