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BC857CT-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.

componenttransistorsbc857ct-7-ffactory-2.0.0extractor-text

Verified BC857CT-7-F

by Ray · last 4 Nov 2026 · 1 record · files match
SymbolFootprint3D modelPins

Verification log 1 record

4 Nov 2026RayPublished by the parts factory: tier mfr, 3 pinsfiles match
SymbolFootprint3D modelPinsfor all variants
  • ✓component-page-verify: PASS
  • ✓cad_props: Datasheet, MPN and distributor properties match page.json
  • ✓component: BC857CT-7-F · SOT-523 · 3 pins
  • ✓copper: 3 copper pads, none touching another net
  • ✓datasheet: all 3 pin names found in the 6-page datasheet
  • ✓distributor: lcsc C151572, digikey BC857CT-7FDITR-ND, mouser 621-BC857CT-7-F
  • ✓family: SOT-523
  • ✓files: 7 declared files present
  • ✓hero: docs/hero.png 4000x2500
  • ✓lbr: OK: /tmp/cpv-vayn4yv5/x.lbr is a valid EAGLE .lbr with complete deviceset
  • ✓license: CC-BY-SA-4.0
  • ✓models_3d: 2 records
  • ✓package_fit: height and body within the datasheet's package drawing (datasheet p.5)
  • ✓pads: 3 pins = 3 pads
  • ✓pose: 2 STEP(s) Z-up, seated, centred
  • ✓symbol: 3 pins agree
  • ✓visibility: public, source open
Evidencedatasheet
Verified files✓ bc857ct-7-f.kicad_sym✓ bc857ct-7-f.kicad_mod✓ bc857ct-7-f.step
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Made with KiCad 10.0 · needs KiCad 10.0 or later to open · KiCad file format 20260206
Name Last commit message Last updated
docs Publish 0.1.0 · Ray 22h ago
viewers bc857ct-7-f: viewers · Ray 22h ago
bc857ct-7-f-etched.glb Publish 0.1.0 · Ray 22h ago
bc857ct-7-f-etched.step bc857ct-7-f: factory component page (tier=mfr) · Ray 22h ago
bc857ct-7-f-hero.glb bc857ct-7-f: hero GLB from the etched model (keeps the MPN mark) · Ray 22h ago
bc857ct-7-f-hero.overlay.json Publish 0.1.0 · Ray 22h ago
bc857ct-7-f.glb Publish 0.1.0 · Ray 22h ago
bc857ct-7-f.kicad_mod Publish 0.1.0 · Ray 22h ago
bc857ct-7-f.kicad_sym Publish 0.1.0 · Ray 22h ago
bc857ct-7-f.lbr Publish 0.1.0 · Ray 22h ago
bc857ct-7-f.step Publish 0.1.0 · Ray 22h ago
package.json Publish 0.1.0 · Ray 22h ago
page.json Set visibility: public · Ray 22h ago
README.md Publish 0.1.0 · Ray 22h ago
verification.json Verified: Published by the parts factory: tier mfr, 3 pins · Ray 22h ago

BC857CT-7-F

Diodes Incorporated · Bipolar Transistors - BJT · SOT-523

BC857CT-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 terminal (bottom-left in top view); emitter-base voltage is limited to -6 V (VEBO).
2 E passive Emitter terminal (bottom-right in top view) of the PNP transistor; the emitter-base breakdown voltage BVEBO is -6 V minimum.
3 C passive Collector terminal (top in top view); rated for VCEO -45 V, VCBO -50 V and IC -100 mA.

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
DC Current Gain (group C) hFE 420 800 VCE = -5V, IC = -2mA 3
Base-Emitter Voltage VBE(ON) -600 mV VCE = -5V, IC = -2mA 3
Base-Emitter Voltage VBE(ON) -750 mV VCE = -5V, IC = -2mA 3
Base-Emitter Voltage VBE(ON) -820 mV VCE = -5V, IC = -10mA 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 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
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
Collector-Emitter Cutoff Current ICBO -15 nA VCB = -30V 3
Collector-Emitter 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 2
Collector-Emitter Voltage VCEO -45 V 2
Emitter-Base Voltage VEBO -6 V 2
Collector Current IC -100 mA 2
Electrostatic Discharge, Human Body Model ESD HBM 4000 V JEDEC Class 3A 2
Electrostatic Discharge, Machine Model ESD MM 400 V JEDEC Class C 2
Operating and Storage Temperature Range TJ, TSTG -55 150 °C 2
Power Dissipation PD 150 mW Note 5: collector lead on minimum recommended pad layout, 1oz copper, single-sided 1.6mm FR-4, still air 2
Thermal Resistance, Junction to Ambient RθJA 833 °C/W Note 5: collector lead on minimum recommended pad layout, 1oz copper, single-sided 1.6mm FR-4, still air 2

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: BC857CT-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: bc857ct-7-f-etched.step / bc857ct-7-f-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); bc857ct-7-f.step / bc857ct-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 2026-11-04, 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