component
BU406
Public Made by Adomby adom
Changjing Bipolar (BJT), TO-220-3L. 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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README
markdownBU406
Changjing · Bipolar (BJT) · TO-220-3L
BU406 from Changjing, in a TO-220-3L. 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 | BASE | passive | Base terminal of the NPN transistor, with emitter-base voltage VEBO rated at 6 V in the absolute maximum ratings. |
| 2 | COLLECTOR | passive | Collector terminal, rated for VCBO 400 V, VCEO 200 V and collector current IC 7 A, with collector power dissipation PC 2 W. |
| 3 | EMITTER | passive | Emitter terminal, the reference for the VCEO 200 V and VEBO 6 V ratings of the transistor. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Changjing |
| Package | TO-220-3L |
| Category | Transistors/Thyristors |
| Pins | 3 |
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-base breakdown voltage | V(BR)CBO | 400 | V | IC=100uA, IE=0 | 1 | ||
| Collector-emitter breakdown voltage | V(BR)CEO | 200 | V | IC=100mA,IB=0 | 1 | ||
| Emitter-base breakdown voltage | V(BR)EBO | 6 | V | IE=100uA,IC=0 | 1 | ||
| Collector cut-off current | ICES | 5 | mA | VCB=400V,IE=0 | 1 | ||
| Collector cut-off current | ICES | 1 | mA | VCB=250V,IE=0 | 1 | ||
| Collector cut-off current | ICBO | 5 | μA | VCB=300V,IE=0 | 1 | ||
| Emitter cut-off current | IEBO | 1 | mA | VEB=6V,IC=0 | 1 | ||
| DC current gain | hFE | 50 | 100 | VCE=5V, IC=1A | 1 | ||
| Collector-emitter saturation voltage | VCE(sat) | 1 | V | IC=5A,IB=500mA | 1 | ||
| Base-emitter saturation voltage | VBE(sat) | 1.2 | V | IC=5A,IB=500mA | 1 | ||
| Collector output capacitance | Cob | 80 | pF | VCB=10V,IE=0, f=1MHz | 1 | ||
| Transition frequency | fT | 10 | MHz | VCE=5V,IC=0.2A,f=10MHz | 1 | ||
| Collector-base voltage | VCBO | 400 | V | 1 | |||
| Collector-emitter voltage | VCEO | 200 | V | 1 | |||
| Emitter-base voltage | VEBO | 6 | V | 1 | |||
| Collector current | IC | 7 | A | 1 | |||
| Collector power dissipation | PC | 2 | W | 1 | |||
| Thermal resistance from junction to ambient | RθJA | 62.5 | ℃/W | 1 | |||
| Junction temperature | Tj | 150 | ℃ | 1 | |||
| Storage temperature | Tstg | -55 | 150 | ℃ | 1 |
CAD (KiCad official)
- Symbol:
BU406 - Footprint:
Package_TO_SOT_THT:TO-220-3_Vertical - 3D model: TO-220-3L (KiCad packages3D, STEP)
- 3D model files:
bu406-etched.step/bu406-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);bu406.step/bu406.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Changjing datasheet (3 pp, sha256
6705b97a2eb18b24, retrieved 2026-10-19, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-haiku-5-5(text), consensusclaude-sonnet-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).