component
BCX42
Public Made by Adomby adom
YFW Bipolar (BJT), SOT-23. 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
markdownBCX42
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.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);bcx42.step/bcx42.glbare 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, primaryclaude-sonnet-5-5(text+vision), consensusclaude-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).