component
BC857B_R1_00001
Public Made by Adomby adom
PANJIT International 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
markdownBC857B_R1_00001
PANJIT International · Bipolar (BJT) · SOT-23
BC857B_R1_00001 from PANJIT International, 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 | Base | input | Base terminal of the PNP transistor, with the emitter-base voltage limited to -5 V (VEBO) per the absolute ratings. |
| 2 | Emitter | passive | Emitter terminal of the PNP transistor, the reference for the base-emitter voltage and the -5 V VEBO rating. |
| 3 | Collector | passive | Collector terminal of the PNP transistor; for the BC857 device the collector-emitter voltage is -45 V and the continuous collector current is -100 mA (peak -200 mA). |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | PANJIT International |
| 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 - Emitter Breakdown Voltage (BC857A,B,C) | V(BR)CEO | -45 | V | IC=-10mA, IB=0 | 2 | ||
| Collector - Base Breakdown Voltage (BC857A,B,C) | V(BR)CBO | -50 | V | IC =-10μA, IE=0 | 2 | ||
| Emitter - Base Breakdown Voltage | V(BR)EBO | -5 | V | IE=-1μA, IC =0 | 2 | ||
| Emitter-Base Cutoff Current | IEBO | -100 | nA | VEB=-5V | 2 | ||
| Collector-Base Cutoff Current | ICBO | -15 | nA | VCB=-30V, IE=0 | 2 | ||
| Collector-Base Cutoff Current (TJ=150°C) | ICBO | -4 | μA | VCB=-30V, IE=0, TJ=150°C | 2 | ||
| DC Current Gain (BC857B group) | hFE | 150 | IC=-10μA, VCE=-5V | 2 | |||
| DC Current Gain (BC857B group) | hFE | 180 | 290 | 520 | IC=-2mA, VCE=-5V | 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) | -0.7 | V | IC=-10mA, IB=-0.5mA | 2 | ||
| Base - Emitter Saturation Voltage | VBE(SAT) | -0.9 | V | IC=-100mA, IB=-5mA | 2 | ||
| Base - Emitter On Voltage | VBE(ON) | -0.6 | -0.75 | V | IC=-2mA, VCE=-5V | 2 | |
| Base - Emitter On Voltage | VBE(ON) | -0.82 | V | IC=-10mA, VCE=-5V | 2 | ||
| Collector - Base Capacitance | CCB | 4.5 | pF | VCB=-10V, IE=0, f=1MHz | 2 | ||
| Collector - Emitter Voltage (BC857) | VCEO | -45 | V | 1 | |||
| Collector - Base Voltage (BC857) | VCBO | -50 | V | 1 | |||
| Emitter - Base Voltage | VEBO | -5 | V | 1 | |||
| Collector Current - Continuous | IC | -100 | mA | 1 | |||
| Peak Collector Current | ICM | -200 | mA | 1 | |||
| Max Power Dissipation | PTOT | 330 | mW | Transistor mounted on FR-4 board 8 cm2 (Note 1) | 1 | ||
| Operating Junction and Storage Temperature Range | TJ,TSTG | -50 | 150 | °C | 1 | ||
| Typical Thermal Resistance, Junction to Ambient | RθJA | 375 | °C/W | 1 |
CAD (KiCad official)
- Symbol:
BC857B_R1_00001 - Footprint:
Package_TO_SOT_SMD:SOT-23 - 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files:
bc857b-r1-00001-etched.step/bc857b-r1-00001-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);bc857b-r1-00001.step/bc857b-r1-00001.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: PANJIT International datasheet (5 pp, sha256
b768e2b14ba986ca, retrieved 2026-10-17, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-haiku-5-5(text), consensusclaude-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).