component
BCR421UW6Q-7
Public Made by Adomby adom
Diodes Incorporated LED Drivers, SOT-26. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
3D Model
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Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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Contents
README
markdownBCR421UW6Q-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.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);bcr421uw6q-7.step/bcr421uw6q-7.glbare 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, primaryclaude-sonnet-5-5(text+vision), consensusclaude-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).