component
BC858CW
Public Made by Adomby adom
Yangzhou Yangjie Elec Tech Bipolar (BJT), SOT-323. 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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Contents
README
markdownBC858CW
Yangzhou Yangjie Elec Tech · Bipolar (BJT) · SOT-323
BC858CW from Yangzhou Yangjie Elec Tech, in a SOT-323. 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; the datasheet gives a collector-base breakdown of -30 V and an emitter-base maximum of -6 V for BC858CW. |
| 2 | E | passive | Emitter of the PNP transistor; the emitter-base voltage is rated at -6 V maximum. |
| 3 | C | passive | Collector of the PNP transistor; the datasheet gives -30 V collector-emitter voltage (BC858CW) and -0.1 A continuous current. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Yangzhou Yangjie Elec Tech |
| Package | SOT-323 |
| 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 breakdown voltage (BC858) | BVCBO | -30 | V | IC= -10µA, IE=0 | 2 | ||
| Collector-emitter breakdown voltage (BC858) | BVCEO | -30 | V | IC= -10mA, IB=0 | 2 | ||
| Emitter-base breakdown voltage | BVEBO | -5 | V | IE= -1µA, IC=0 | 2 | ||
| Collector cut-off current | ICBO | -0.1 | μA | VCB=-30 V, IE=0 | 2 | ||
| Emitter cut-off current | IEBO | -0.1 | μA | VEB=-5 V, IC=0 | 2 | ||
| DC current gain (BC857CW, BC858CW) | hFE | 420 | 800 | VCE= -5V, IC= -2mA | 2 | ||
| Collector-emitter saturation voltage | VCE(sat) | -0.65 | V | IC=-100mA, IB= -5mA | 2 | ||
| Base-emitter saturation voltage | VBE(sat) | -1.1 | V | IC=-100mA, IB= -5mA | 2 | ||
| Transition frequency | fT | 100 | MHz | VCE= -5 V, IC= -10mA, f=100MHz | 2 | ||
| Collector output capacitance | Cob | 4.5 | pF | VCB=-10V, f=1MHz | 2 | ||
| Collector-base voltage (BC858AW/BW/CW) | BVCBO | -30 | V | Ta=25℃ | 1 | ||
| Collector-emitter voltage (BC858AW/BW/CW) | BVCEO | -30 | V | Ta=25℃ | 1 | ||
| Emitter-base voltage | BVEBO | -6 | V | Ta=25℃ | 1 | ||
| Collector current, continuous | IC | -0.1 | A | Ta=25℃ | 1 | ||
| Collector power dissipation | PC | 200 | mW | Ta=25℃ | 1 | ||
| Junction temperature | Tj | 150 | ℃ | 1 | |||
| Storage temperature | Tstg | -55 | 150 | ℃ | 1 | ||
| Thermal resistance, junction to ambient | RΘJA | 625 | ℃/W | 1 |
Materials and finish
As the datasheet states them (page.json metadata.appearance; the 3D model's colours follow it).
| Part | Material | Colour / plating | Datasheet says | Page |
|---|---|---|---|---|
| contacts | tin | ● Terminals: Tin plated leads, solderable per J-STD-002 and JESD22-B102 | 1 |
CAD (KiCad official)
- Symbol:
BC858CW - Footprint:
Package_TO_SOT_SMD:SOT-323_SC-70 - 3D model: SOT-323 (KiCad packages3D, STEP)
- 3D model files:
bc858cw-etched.step/bc858cw-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);bc858cw.step/bc858cw.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Yangzhou Yangjie Elec Tech datasheet (5 pp, sha256
4320f8b33b08bb7c, retrieved 2026-10-19, 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).