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BC857-B

Public Made by Adom

by adom

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

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BC857-B

Foshan Blue Rocket Elec · Bipolar (BJT) · SOT-23

BC857-B from Foshan Blue Rocket Elec, 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 (datasheet pinning: PIN1 = Base); the datasheet gives no pin-specific voltage or current limit, only device absolute maximum ratings (VCBO -50 V, VCEO -45 V, VEBO -5.0 V, IC -100 mA continuous).
2 Emitter passive Emitter terminal of the PNP transistor (datasheet pinning: PIN2 = Emitter); the datasheet gives no pin-specific limit beyond the device absolute maximum ratings.
3 Collector passive Collector terminal of the PNP transistor (datasheet pinning: PIN3 = Collector); the datasheet gives no pin-specific limit beyond the device absolute maximum ratings, including collector power dissipation PC 350 mW.

Key specifications

Parameter Value
Manufacturer Foshan Blue Rocket Elec
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 to Emitter Saturation Voltage (1) VCE(sat)(1) -0.09 -0.3 V IC=-10mA IB=-0.5mA 2
Collector to Emitter Saturation Voltage (2) VCE(sat)(2) -0.25 -0.65 V IC=-100mA IB=-5.0mA 2
Base to Emitter Saturation Voltage (1) VBE(sat)(1) -0.7 V IC=-10mA IB=-0.5mA 2
Base to Emitter Saturation Voltage (2) VBE(sat)(2) -0.9 V IC=-100mA IB=-5.0mA 2
Base to Emitter On Voltage (1) VCE(ON)(1) -0.6 -0.65 -0.75 V VCE=5.0V IC=2.0mA 2
Base to Emitter On Voltage (2) VCE(ON)(2) -0.82 V VCE=5.0V IC=10mA 2
Collector Cut-Off Current ICBO -0.015 μA VCB=-30V IE=0 2
Transition Frequency fT 150 MHz VCE=5.0V IC=10mA f=100MHz 2
Collector Output Capacitance Cob 4.5 pF VCB=10V IE=0 f=1.0MHz 2
Noise Figure NF 2 10 dB VCE=6.0V IC=0.1mA Rg=10KΩ f=1.0KHz 2
Collector to Base Voltage VCBO -50 V Ta=25℃ 2
Collector to Emitter Voltage VCEO -45 V Ta=25℃ 2
Emitter to Base Voltage VEBO -5 V Ta=25℃ 2
Collector Current - Continuous IC -100 mA Ta=25℃ 2
Collector Power Dissipation PC 350 mW Ta=25℃ 2
Junction Temperature Tj 150 ℃ 2
Storage Temperature Range Tstg -55 150 ℃ 2

CAD (KiCad official)

  • Symbol: BC857-B
  • Footprint: Package_TO_SOT_SMD:SOT-23
  • 3D model: SOT-23 (KiCad packages3D, STEP)
  • 3D model files: bc857-b-etched.step / bc857-b-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); bc857-b.step / bc857-b.glb are the bare package body.

Provenance

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

  • Datasheet: Foshan Blue Rocket Elec datasheet (6 pp, sha256 65eb082ca0d6a5ae, retrieved 2026-10-18, 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