component

BC557B

Public Made by Adom

by adom

LGE Bipolar (BJT), TO-92. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

componenttransistors-thyristorsbc557bfactory-2.0.0extractor-text
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Made with KiCad 10.0 · needs KiCad 10.0 or later to open · KiCad file format 20260206
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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.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 (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