component
BC237
Public Made by Adomby adom
Changjing Bipolar Transistors - BJT, TO-92. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
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BC237
Changjing · Bipolar Transistors - BJT · TO-92
BC237 from Changjing, in a TO-92. 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 | COLLECTOR | passive | Collector; VCEO max 45 V (BC237) or 25 V (BC238/239), continuous collector current 0.1 A. |
| 2 | BASE | input | Base; emitter-base voltage max 6 V (BC237) or 5 V (BC238/239). |
| 3 | EMITTER | passive | Emitter; the datasheet gives collector power dissipation of 350 mW and junction temperature range of -55 to 150 °C for the device. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Changjing |
| Package | TO-92 |
| Category | Triode/MOS Tube/Transistor |
| 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-Emitter Voltage | VCEO | 45 | V | BC237 | 1 | ||
| Emitter-Base Voltage | VEBO | 6 | V | BC237 | 1 | ||
| Collector Current - Continuous | IC | 0.1 | A | 1 | |||
| Collector Power Dissipation | PC | 350 | mW | Ta=25℃ | 1 | ||
| Operation Junction and Storage Temperature Range | TJ,Tstg | -55 | 150 | ℃ | 1 | ||
| Thermal Resistance, Junction to Ambient | RθJA | 357 | ℃/W | 1 | |||
| Thermal Resistance, Junction to Case | RθJC | 125 | ℃/W | 1 | |||
| Collector-base breakdown voltage | V(BR)CBO | 50 | V | IC=100μA, IE=0, BC237 | 2 | ||
| Collector-emitter breakdown voltage | V(BR)CEO | 45 | V | IC=2mA, IB=0, BC237 | 2 | ||
| Emitter-base breakdown voltage | V(BR)EBO | 6 | V | IE=100μA, IC=0, BC237 | 2 | ||
| Collector cut-off current | ICBO | 15 | nA | VCE=50V, VBE=0, BC237 | 2 | ||
| Collector output capacitance | Cob | 4.5 | pF | VCB=10V, IE=0, f=1MHz | 2 | ||
| Emitter-base capacitance | Cib | 8 | Pf | VEB=0.5V, IC=0, f=1MHz | 2 |
CAD (KiCad official)
- Symbol:
BC237 - Footprint:
Package_TO_SOT_THT:TO-92_Inline - 3D model: TO-92 (KiCad packages3D, STEP)
- 3D model files:
bc237-etched.step/bc237-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);bc237.step/bc237.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Changjing datasheet (4 pp, sha256
ebe180cb2865e62f, retrieved 2026-10-22, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-sonnet-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).
# BC237
**Changjing** · Bipolar Transistors - BJT · TO-92
BC237 from Changjing, in a TO-92. 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 | COLLECTOR | passive | Collector; VCEO max 45 V (BC237) or 25 V (BC238/239), continuous collector current 0.1 A. |
| 2 | BASE | input | Base; emitter-base voltage max 6 V (BC237) or 5 V (BC238/239). |
| 3 | EMITTER | passive | Emitter; the datasheet gives collector power dissipation of 350 mW and junction temperature range of -55 to 150 °C for the device. |
## Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Changjing |
| Package | TO-92 |
| Category | Triode/MOS Tube/Transistor |
| 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-Emitter Voltage | VCEO | | | 45 | V | BC237 | 1 |
| Emitter-Base Voltage | VEBO | | | 6 | V | BC237 | 1 |
| Collector Current - Continuous | IC | | | 0.1 | A | | 1 |
| Collector Power Dissipation | PC | | | 350 | mW | Ta=25℃ | 1 |
| Operation Junction and Storage Temperature Range | TJ,Tstg | -55 | | 150 | ℃ | | 1 |
| Thermal Resistance, Junction to Ambient | RθJA | | | 357 | ℃/W | | 1 |
| Thermal Resistance, Junction to Case | RθJC | | | 125 | ℃/W | | 1 |
| Collector-base breakdown voltage | V(BR)CBO | 50 | | | V | IC=100μA, IE=0, BC237 | 2 |
| Collector-emitter breakdown voltage | V(BR)CEO | 45 | | | V | IC=2mA, IB=0, BC237 | 2 |
| Emitter-base breakdown voltage | V(BR)EBO | 6 | | | V | IE=100μA, IC=0, BC237 | 2 |
| Collector cut-off current | ICBO | | | 15 | nA | VCE=50V, VBE=0, BC237 | 2 |
| Collector output capacitance | Cob | | | 4.5 | pF | VCB=10V, IE=0, f=1MHz | 2 |
| Emitter-base capacitance | Cib | | | 8 | Pf | VEB=0.5V, IC=0, f=1MHz | 2 |
## CAD (KiCad official)
- Symbol: `BC237`
- Footprint: `Package_TO_SOT_THT:TO-92_Inline`
- 3D model: TO-92 (KiCad packages3D, STEP)
- 3D model files: `bc237-etched.step` / `bc237-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `bc237.step` / `bc237.glb` are the bare package body.
## Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- **Datasheet:** [Changjing datasheet](docs/bc237-datasheet.pdf) (4 pp, sha256 `ebe180cb2865e62f`, retrieved 2026-10-22, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-5-5` (text), consensus `claude-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).
[Datasheet PDF](docs/bc237-datasheet.pdf)