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BCX42

Public Made by Adom

by adom

YFW Bipolar (BJT), SOT-23. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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BCX42

YFW · Bipolar (BJT) · SOT-23

BCX42 from YFW, in a SOT-23. 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 B input Base of the PNP transistor; Ib max -100 mA (peak -200 mA), emitter-base voltage max -5 V.
2 E passive Emitter of the PNP transistor; emitter-base breakdown BVEBO is -5 V.
3 C passive Collector of the PNP transistor; Ic max -800 mA (peak -1 A), BVCEO -125 V, Ptot 330 mW.

Key specifications

Parameter Value
Manufacturer YFW
Package SOT-23
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 BVCBO -125 V 1
Collector-emitter voltage BVCEO -125 V 1
Emitter-base voltage BVEBO -5 V 1
Collector current IC -800 mA 1
Peak collector current ICM -1 A 1
Base current IB -100 mA 1
Peak base current IBM -200 mA 1
Total power dissipation Ptot 330 mW 1
Junction temperature Tj 150 ℃ 1
Storage temperature Tstg -55 150 ℃ 1
Junction - soldering point thermal resistance RθJS 215 ℃/W 1
Collector-base breakdown voltage BVCBO -125 V IC = -100μA, IE = 0 2
Collector-emitter breakdown voltage BVCEO -125 V IC = -1mA, IB = 0 2
Emitter-base breakdown voltage BVEBO -5 V IE = -100μA, IC = 0 2
Collector cut-off current ICBO -0.1 μA VCB = -100V, IE = 0 2
Collector-emitter cutoff current ICEO -10 μA VCE = -100V, IB = 0 2
Emitter cut-off current IEBO -0.1 μA VEB = -4V, IC = 0 2
DC current gain hFE 25 VCE = -1V, IC = -0.1mA 2
DC current gain hFE 63 VCE = -1V, IC = -100mA 2
DC current gain hFE 40 VCE = -1V, IC = -200mA 2
Collector-emitter saturation voltage VCE(sat) -0.9 V IC = -300mA, IB = -30mA 2
Base-emitter saturation voltage VBE(sat) -1.4 V IC = -300mA, IB = -30mA 2
Gian bandwidth product fT 150 MHZ VCE = -5V, IC = -20mA, f=20MHz 2
Collector-base capacitance Cob 12 pF VCB = -10V, IE = 0, f=1MHz 2

CAD (KiCad official)

  • Symbol: BCX42
  • Footprint: Package_TO_SOT_SMD:SOT-23
  • 3D model: SOT-23 (KiCad packages3D, STEP)
  • 3D model files: bcx42-etched.step / bcx42-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); bcx42.step / bcx42.glb are the bare package body.

Provenance

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

  • Datasheet: YFW datasheet (4 pp, sha256 de7ba898e04f78fa, retrieved 2026-10-17, tier: lcsc)
  • Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-sonnet-5-5 (text+vision), consensus claude-opus-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