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.
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
markdownBC557B
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).