BCR420UW6 / BCR421UW6
LINEAR LED CONSTANT CURRENT REGULATOR IN SOT26
Description
Features
The BCR420U and BCR421U monolithically integrate 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.
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
(BCR421U)
VOUT – 40V Supply Voltage
PD up to 1W in SOT26 (SC74R)
Low-Side Control Enabling PWM Input < 25kHz (BCR421U)
Negative Temperature Coefficient (NTC) Reduces IOUT with
Increasing Temperature
With the low-side control, the BCR421U has an Enable (EN) pin
which can be pulse-width modulated (PWM) up to 25kHz by a micro-
controller for LED dimming.
Parallel Devices to Increase Regulated Current
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
Qualified to AEC-Q101 Standards for High Reliability
Automotive-Compliant Parts are Available Under Separate
Datasheet (BCR420UW6Q/BCR421UW6Q)
With no need for additional external components, this CCR is fully
integrated into an SOT26 (SC74R) minimizing PCB area and
component count.
Mechanical Data
Applications
Case: SOT26 (SC74R)
Constant Current Regulation (CCR) in:
Case Material: Molded Plastic. ―Green‖ Molding Compound.
UL Flammability Rating 94V-0
Automotive Interior Lighting
Moisture Sensitivity: Level 1 per J-STD-020
Terminals: Finish - Matte Tin Plated Leads. Solderable per MIL-
STD-202, Method 208
Emergency Lighting
Signage, Advertising, Decorative and Architectural Lighting
Retail Lighting in Fridges, Freezer Cases and Vending Machines
Weight: 0.018 grams (Approximate)
SOT26 (SC74R)
EN
OUT
Pin Name
Pin Function
EN
REXT
OUT
GND
OUT
Regulated Output Current
Enable for Biasing
Transistor
Rext
REXT
OUT
OUT
EN
(Optional)
(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)
Product
BCR420UW6-7
BCR421UW6-7
Compliance
AEC-Q101
AEC-Q101
Marking
Reel Size (inches)
Tape Width (mm)
Quantity per Reel
3,000
420
421
7
7
8
8
3,000
Notes:
1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant.
2. See http://www.diodes.com/quality/lead_free.html 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/.
1 of 13
www.diodes.com
June 2017
© Diodes Incorporated
BCR420UW6 / BCR421UW6
Document number: DS37667 Rev. 5 - 2
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