component
BC557B
Public Made by Adomby adom
LGE Bipolar (BJT), TO-92. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
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BC557B
LGE · Bipolar (BJT) · TO-92
BC557B from LGE, 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 | EMITTER | passive | Emitter of the PNP BC557B, limited by the -5 V emitter-base voltage rating (VEBO) and the -100 mA continuous collector current rating. |
| 2 | BASE | passive | Base of the PNP BC557B; the datasheet gives VBE(sat) of -1 V max at IC = -100 mA with IB = -5 mA. |
| 3 | COLLECTOR | passive | Collector of the PNP BC557B, rated for -50 V VCBO and -45 V VCEO (BC557 column), with 625 mW collector power dissipation. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | LGE |
| Package | TO-92 |
| Category | Transistors/Thyristors |
| Pins | 3 |
CAD (KiCad official)
- Symbol:
BC557B - Footprint:
Package_TO_SOT_THT:TO-92_Inline - 3D model: TO-92 (KiCad packages3D, STEP)
- 3D model files:
bc557b-etched.step/bc557b-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);bc557b.step/bc557b.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: LGE datasheet (4 pp, sha256
3f07b60d7056ca34, retrieved 2026-10-09, 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).
# BC557B
**LGE** · Bipolar (BJT) · TO-92
BC557B from LGE, 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 | EMITTER | passive | Emitter of the PNP BC557B, limited by the -5 V emitter-base voltage rating (VEBO) and the -100 mA continuous collector current rating. |
| 2 | BASE | passive | Base of the PNP BC557B; the datasheet gives VBE(sat) of -1 V max at IC = -100 mA with IB = -5 mA. |
| 3 | COLLECTOR | passive | Collector of the PNP BC557B, rated for -50 V VCBO and -45 V VCEO (BC557 column), with 625 mW collector power dissipation. |
## Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | LGE |
| Package | TO-92 |
| Category | Transistors/Thyristors |
| Pins | 3 |
## CAD (KiCad official)
- Symbol: `BC557B`
- Footprint: `Package_TO_SOT_THT:TO-92_Inline`
- 3D model: TO-92 (KiCad packages3D, STEP)
- 3D model files: `bc557b-etched.step` / `bc557b-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `bc557b.step` / `bc557b.glb` are the bare package body.
## Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- **Datasheet:** [LGE datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588892868123090944) (4 pp, sha256 `3f07b60d7056ca34`, retrieved 2026-10-09, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-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/bc557b-datasheet.pdf)