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BC557-TA

Public Made by Adom

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

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BC557-TA

Changjing · Bipolar (BJT) · TO-92

BC557-TA 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 of the PNP transistor; the datasheet limits are VCBO -80/-50/-30 V and VCEO -65/-45/-30 V for BC556/BC557/BC558, with continuous collector current of -0.1 A.
2 BASE passive Base of the PNP transistor; the emitter-base voltage is rated at -5 V and the base drives the device with a base current of -0.5 mA to -5 mA in the saturation test conditions.
3 EMITTER passive Emitter of the PNP transistor; the emitter-base breakdown voltage V(BR)EBO is -5 V minimum at IE = -100 µA.

Key specifications

Parameter Value
Manufacturer Changjing
Package TO-92
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 voltage (BC557) VCBO -50 V 1
Collector-emitter voltage (BC557) VCEO -45 V 1
Emitter-base voltage VEBO -5 V 1
Collector current-continuous IC -0.1 A 1
Collector power dissipation PC 625 mW 1
Thermal resistance junction to ambient RθJA 200 ℃/W 1
Operation junction and storage temperature range TJ,Tstg -55 150 ℃ 1
Collector-base breakdown voltage (BC557) V(BR)CBO -50 V IC= -0.1mA,IE=0 2
Collector-emitter breakdown voltage (BC557) V(BR)CEO -45 V IC=-2mA,IB=0 2
Emitter-base breakdown voltage V(BR)EBO -5 V IE=-100μA,IC=0 2
Collector cut-off current (BC557) ICBO -0.1 μA VCB=-45V,IE=0 2
Emitter cut-off current IEBO -0.1 μA VEB=-5V,IC=0 2
DC current gain hFE 120 800 VCE=-5V, IC=-2mA 2
Collector-emitter saturation voltage VCE(sat) -0.3 V IC=-10mA,IB=-0.5mA 2
Collector-emitter saturation voltage VCE(sat) -0.65 V IC=-100mA,IB=-5mA 2
Base-emitter saturation voltage VBE(sat) -0.8 V IC=-10mA,IB=-0.5mA 2
Base-emitter saturation voltage VBE(sat) -1 V IC=-100mA,IB=-5mA 2
Base-emitter voltage VBE -0.55 -0.7 V VCE=-5V, IC=-2mA 2
Base-emitter voltage VBE -0.82 V VCE=-5V, IC=-10mA 2
Collector output capacitance Cob 6 pF VCB=-10V,IE=0, f=1MHz 2
Transition frequency (BC557) fT 3150 MHz VCE=-5V,IC=-10mA, f=100MHz 2

CAD (KiCad official)

  • Symbol: BC557-TA
  • Footprint: Package_TO_SOT_THT:TO-92_Inline
  • 3D model: TO-92 (KiCad packages3D, STEP)
  • 3D model files: bc557-ta-etched.step / bc557-ta-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); bc557-ta.step / bc557-ta.glb are the bare package body.

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

  • Datasheet: Changjing datasheet (4 pp, sha256 d56a67b6b9bbd958, retrieved 2026-10-17, 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