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BC557BTF

Public Made by Adom

by adom

onsemi Bipolar Transistors - BJT, TO-92-3. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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BC557BTF

onsemi · Bipolar Transistors - BJT · TO-92-3

BC557BTF from onsemi, in a TO-92-3. 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 Collector passive Collector of the PNP transistor; VCEO is -45 V and DC collector current is -100 mA max for BC557 (peak -200 mA).
2 Base passive Base of the PNP transistor; peak base current is -200 mA max and emitter-base voltage is -5 V max.
3 Emitter passive Emitter of the PNP transistor; VEBO is -5 V max relative to the base.

Key specifications

Parameter Value
Manufacturer onsemi
Package TO-92-3
Category Transistors
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 VCBO -50 V BC557 / BC560, TA = 25°C 3
Collector-Emitter Voltage VCEO -45 V BC557 / BC560, TA = 25°C 3
Emitter-Base Voltage VEBO -5 V TA = 25°C 3
Collector Current (DC) IC -100 mA TA = 25°C 3
Peak Collector Current (Pulse) ICP -200 mA TA = 25°C 3
Peak Base Current (Pulse) IBP -200 mA TA = 25°C 3
Junction Temperature TJ 150 °C TA = 25°C 3
Storage Temperature Range TSTG -65 150 °C -65 to +150 3
Total Power Dissipation PD 500 mW TA = 25°C, FR-4 PCB 76 mm x 114 mm x 1.57 mm, minimum land pattern 3
Derate Above 25°C PD 4 mW/°C Above 25°C 3
Thermal Resistance, Junction-to-Ambient RθJA 250 °C/W FR-4 PCB 76 mm x 114 mm x 1.57 mm, minimum land pattern 3
Collector Cut-Off Current ICBO -15 nA VCB = -30 V, IE = 0 4
DC Current Gain (B grade) hFE 200 450 VCE = -5 V, IC = -2 mA; classification B 200 ~ 450 4
DC Current Gain (family) hFE 110 800 VCE = -5 V, IC = -2 mA 4
Collector-Emitter Saturation Voltage VCE(sat) -90 -300 mV IC = -10 mA, IB = -0.5 mA 4
Collector-Emitter Saturation Voltage VCE(sat) -250 -650 mV IC = -100 mA, IB = -5 mA 4
Base-Emitter On Voltage VBE(on) -600 -660 -750 mV VCE = -5 V, IC = -2 mA 4
Noise Figure NF 2 10 dB BC556 / BC557 / BC558, VCE = -5 V, IC = -200 μA, f = 1 kHz, RG = 2 kΩ 4
Base-Emitter Saturation Voltage VBE(sat) -700 mV IC = -10 mA, IB = -0.5 mA 4
Base-Emitter Saturation Voltage VBE(sat) -900 mV IC = -100 mA, IB = -5 mA 4
Base-Emitter On Voltage VBE(on) -800 mV VCE = -5 V, IC = -10 mA 4
Current Gain Bandwidth Product fT 150 MHz VCE = -5 V, IC = -10 mA, f = 10 MHz 4
Output Capacitance Cob 6 pF VCB = -10 V, IE = 0, f = 1 MHz 4

CAD (KiCad official)

  • Symbol: BC557BTF
  • Footprint: Package_TO_SOT_THT:TO-92_Inline
  • 3D model: TO-92-3 (KiCad packages3D, STEP)
  • 3D model files: bc557btf-etched.step / bc557btf-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); bc557btf.step / bc557btf.glb are the bare package body.

Provenance

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

  • Datasheet: onsemi datasheet (10 pp, sha256 9066be14fd580753, retrieved 2026-10-22, tier: manufacturer)
  • Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-sonnet-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