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BC857AT-7-F

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Diodes Incorporated Bipolar Transistors - BJT, SOT-523. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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BC857AT-7-F

Diodes Incorporated · Bipolar Transistors - BJT · SOT-523

BC857AT-7-F from Diodes Incorporated, in a SOT-523. 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 pin-out top view shows it at the bottom left of the package.
2 E passive Emitter of the PNP transistor; the pin-out top view shows it at the bottom right, and VEBO is rated at -6V.
3 C passive Collector of the PNP transistor, on the single-lead side of the package; IC is rated at -100mA and VCEO at -45V.

Key specifications

Parameter Value
Manufacturer Diodes Incorporated
Package SOT-523
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 Breakdown Voltage BVCBO -50 V IC = -100µA, IE = 0 3
Collector-Emitter Breakdown Voltage BVCEO -45 V IC = -1mA, IB = 0 3
Emitter-Base Breakdown Voltage BVEBO -6 V IE = -100µA, IC = 0 3
DC Current Gain (A grade) hFE 125 250 VCE = -5V, IC = -2mA 3
Collector-Emitter Saturation Voltage VCE(SAT) -300 mV IC = -10mA, IB = -0.5mA 3
Collector-Emitter Saturation Voltage VCE(SAT) -650 mV IC = -100mA, IB = -5mA 3
Base-Emitter Voltage VBE(ON) -600 -750 mV VCE = -5V, IC = -2mA 3
Base-Emitter Voltage VBE(ON) -820 mV VCE = -5V, IC = -10mA 3
Collector Cutoff Current ICBO -15 nA VCB = -30V 3
Collector Cutoff Current ICBO -4 µA VCB = -30V, TA = +150°C 3
Output Capacitance COBO 4.5 pF VCB = -10V, f = 1MHz 3
Current Gain-Bandwidth Product fT 100 MHz VCE = -5V, IC = -10mA, f = 100MHz 3
Noise Figure NF 10 dB IC = -0.2mA, VCE = -5V, RS = 2kΩ, f = 1MHz, BW = 200Hz 3
Collector-Base Voltage VCBO -50 V TA = +25°C 2
Collector-Emitter Voltage VCEO -45 V TA = +25°C 2
Emitter-Base Voltage VEBO -6 V TA = +25°C 2
Collector Current IC -100 mA TA = +25°C 2
Power Dissipation PD 150 mW Note 5, TA = +25°C 2
Operating and Storage Temperature Range TJ, TSTG -55 150 °C 2
Thermal Resistance, Junction to Ambient RθJA 833 °C/W Note 5 2
ESD Human Body Model ESD HBM 4000 V JEDEC Class 3A 2
ESD Machine Model ESD MM 400 V JEDEC Class C 2
Base-Emitter Saturation Voltage VBE(SAT) -700 mV IC = -10mA, IB = -0.5mA 3
Base-Emitter Saturation Voltage VBE(SAT) -900 mV IC = -100mA, IB = -5mA 3

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: Finish, Matte Tin Plated Leads. Solderable per MIL-STD-202, Method 208 1

CAD (KiCad official)

  • Symbol: BC857AT-7-F
  • Footprint: Package_TO_SOT_SMD:SOT-523
  • 3D model: SOT-523, generated from the KiCad footprint (body from the F.Fab outline, terminals on the pads, 0.8 mm nominal SOT-523 height). Neither the vendor nor KiCad ships a 3D model for this package, so the dimensions are nominal, not the manufacturer's CAD (STEP)
  • 3D model files: bc857at-7-f-etched.step / bc857at-7-f-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); bc857at-7-f.step / bc857at-7-f.glb are the bare package body.

Provenance

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

  • Datasheet: Diodes Incorporated datasheet (6 pp, sha256 44f38498f6f42233, retrieved 2026-10-24, tier: manufacturer)
  • Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-sonnet-5-5 (text+vision), consensus claude-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).

Datasheet PDF