component

BCR421UW6Q-7

Public Made by Adom

by adom

Diodes Incorporated LED Drivers, SOT-26. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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BCR421UW6Q-7

Diodes Incorporated · LED Drivers · SOT-26

BCR421UW6Q-7 from Diodes Incorporated, in a SOT-26. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin Name Type Function
1 EN input Enable for biasing the transistor; low-side control input that can be PWM-driven up to 25kHz for LED dimming, with absolute maximum VEN of 18V on the BCR421U.
2 OUT passive Regulated output current (LED current sink), tied together with the other OUT pins, with VOUT absolute maximum of 40V and IOUT of 500mA.
3 OUT passive Regulated output current (LED current sink), tied together with the other OUT pins, with VOUT absolute maximum of 40V and IOUT of 500mA.
4 GND power_in Power ground, the reference for all voltage ratings.
5 OUT passive Regulated output current (LED current sink), tied together with the other OUT pins, with VOUT absolute maximum of 40V and IOUT of 500mA.
6 REXT passive Optional external resistor for adjusting output current from the preset 10mA up to 350mA, in parallel with the internal 95 ohm typical resistor.

Key specifications

Parameter Value
Manufacturer Diodes Incorporated
Package SOT-26
Category LED Drivers
Pins 6

Electrical characteristics

Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).

Parameter Symbol Min Typ Max Unit Conditions Page
Collector-Emitter Breakdown Voltage BVCEO 40 V IC = 1mA 3
DC Current Gain hFE 200 350 500 IC = 50mA; VCE = 1V 3
Internal Resistor RINT 85 95 105 Ω IRINT = 10mA 3
Output Current (BCR421U) IOUT 9 10 11 mA VOUT = 1.4V; VEN = 3.3V 3
Voltage Drop (VREXT) VDROP 0.85 0.95 1.05 V IOUT = 10mA 3
Enable Voltage (BCR421U) VEN 18 V 2
Output Current IOUT 500 mA 2
Output Voltage VOUT 40 V 2
Reverse Voltage Between all Terminals VR 0.5 V 2
Recommended Operating Junction Temperature Range TJ -55 150 °C 2
Maximum Operating Junction and Storage Temperature Range TJ, TSTG -65 150 °C 2
Power Dissipation PD 1190 mW Note 6: OUT leads on 50mm x 50mm 1oz Cu, still air 2
Power Dissipation PD 912 mW Note 7: 25mm x 25mm 1oz Cu, still air 2
Thermal Resistance, Junction to Ambient RθJA 105 °C/W Note 6: 50mm x 50mm 1oz Cu 2
Thermal Resistance, Junction to Ambient RθJA 137 °C/W Note 7: 25mm x 25mm 1oz Cu 2
Thermal Resistance, Junction to Lead RθJL 50 °C/W Note 8: junction to solder point at end of OUT leads 2

Materials and finish

As the datasheet states them (page.json metadata.appearance; the 3D model's colours follow it).

Part Material Colour / plating Datasheet says Page
contacts tin  Terminals: Finish - Matte Tin Plated Leads. Solderable per MIL-STD-202, Method 208 1

CAD (KiCad official)

  • Symbol: BCR421UW6Q-7
  • Footprint: Package_TO_SOT_SMD:SOT-23-6
  • 3D model: SOT-26 (KiCad packages3D, STEP)
  • 3D model files: bcr421uw6q-7-etched.step / bcr421uw6q-7-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); bcr421uw6q-7.step / bcr421uw6q-7.glb are the bare package body.

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

  • Datasheet: Diodes Incorporated datasheet (13 pp, sha256 c38471440709fbd5, retrieved 2026-10-19, tier: lcsc)
  • Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-sonnet-5-5 (text+vision), consensus claude-opus-5-5 (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
  • CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF