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BC857CQ-7-F

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

componenttransistors-thyristorsbc857cq-7-ffactory-2.0.0extractor-text

Verified BC857CQ-7-F

by Ray · last 12 Nov 2026 · 1 record · files match
SymbolFootprint3D modelPins

Verification log 1 record

12 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: BC857CQ-7-F · SOT-23-3 · 3 pins
  • ✓copper: 3 copper pads, none touching another net
  • ✓datasheet: all 3 pin names found in the 7-page datasheet
  • ✓distributor: lcsc C6751505, digikey 31-BC857CQ-7-FTR-ND, mouser 621-BC857CQ-7-F
  • ✓family: SOT-23-3
  • ✓files: 7 declared files present
  • ✓hero: docs/hero.png 4000x2500
  • ✓lbr: OK: /tmp/cpv-9os2ffqx/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.6)
  • ✓pads: 3 pins = 3 pads
  • ✓pose: 2 STEP(s) Z-up, seated, centred
  • ✓symbol: 3 pins agree
  • ✓symbol_text: no pin names collide
  • ✓viewers: viewers/footprint.html 17 kB, viewers/symbol.html 7 kB
  • ✓visibility: public, source open
Evidencedatasheet
Verified files✓ bc857cq-7-f.kicad_sym✓ bc857cq-7-f.kicad_mod✓ bc857cq-7-f.step
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Made with kicad-footprint-generator 10.0 · KiCad file format 20260206
Name Last commit message Last updated
docs Publish 0.1.0 · Ray
viewers bc857cq-7-f: viewers rendered from the public page · Ray
bc857cq-7-f-etched.glb bc857cq-7-f: factory component page (tier=mfr) · Ray
bc857cq-7-f-etched.step bc857cq-7-f: factory component page (tier=mfr) · Ray
bc857cq-7-f-hero.glb bc857cq-7-f: hero GLB from the etched model (keeps the MPN mark) · Ray
bc857cq-7-f-hero.overlay.json bc857cq-7-f: hero GLB from the etched model (keeps the MPN mark) · Ray
bc857cq-7-f.glb Publish 0.1.0 · Ray
bc857cq-7-f.kicad_mod Publish 0.1.0 · Ray
bc857cq-7-f.kicad_sym Publish 0.1.0 · Ray
bc857cq-7-f.lbr Publish 0.1.0 · Ray
bc857cq-7-f.step Publish 0.1.0 · Ray
package.json Publish 0.1.0 · Ray
page.json Set visibility: public · Ray
README.md Publish 0.1.0 · Ray
verification.json Verified: Published by the parts factory: tier mfr, 3 pins · Ray

BC857CQ-7-F

Diodes Incorporated · Bipolar (BJT) · SOT-23-3

BC857CQ-7-F from Diodes Incorporated, in a SOT-23-3. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model). Symbol and footprint from KiCad-official CAD; the 3D model is generated from the datasheet's package dimensions.

Pinout

Pin Name Type Function
1 B passive Base terminal; the peak base current IBM is limited to -200 mA.
2 E passive Emitter terminal; the emitter-base voltage VEBO is -5.0 V and the peak emitter current IEM is -200 mA.
3 C passive Collector terminal; the collector-emitter voltage VCEO is -45 V and the continuous collector current IC is -100 mA.

Key specifications

Parameter Value
Manufacturer Diodes Incorporated
Package SOT-23-3
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-Base Breakdown Voltage BVCBO -50 V IC = -10µA 4
Collector-Emitter Breakdown Voltage BVCEO -45 V IC = -10mA 4
Emitter-Base Breakdown Voltage BVEBO -5 V IE = -1µA 4
Collector Cutoff Current ICBO -15 nA VCB = -30V 4
Collector Cutoff Current ICBO -4 µA VCB = -30V, TJ = +150°C 4
Collector Emitter Cutoff Current ICES -15 nA VCE = -50V 4
Emitter-Base Cutoff Current IEBO -100 nA VEB = -5V 4
DC Current Gain hFE 420 520 800 , IC = -2.0mA, VCE = -5V 4
Collector-Emitter Saturation Voltage VCE(SAT) -75 -300 mV IC = -10mA, IB = -0.5mA 4
Collector-Emitter Saturation Voltage VCE(SAT) -250 -650 mV IC = -100mA, IB = -5.0mA 4
Base-Emitter Turn-On Voltage VBE(ON) -600 -650 -750 mV IC = -2mA, VCE = -5V 4
Base-Emitter Turn-On Voltage VBE(ON) -820 mV IC = -10mA, VCE = -5V 4
Base-Emitter Saturation Voltage VBE(SAT) -850 -1100 mV IC = -100mA, IB = -5mA 4
Transition Frequency fT 100 200 MHz VCE = -5V, IC = -10mA, f = 100MHz 4
Noise Figure NF 2 10 dB VCE = -5V, IC = -200µA, RS = 2kΩ, f = 1kHz, Δf = 200Hz 4
Collector-Base Voltage VCBO -50 V TA = +25°C 2
Collector-Emitter Voltage VCEO -45 V TA = +25°C 2
Emitter-Base Voltage VEBO -5 V TA = +25°C 2
Continuous Collector Current IC -100 mA TA = +25°C 2
Peak Collector Current ICM -200 mA TA = +25°C 2
Peak Emitter Current IEM -200 mA TA = +25°C 2
Peak Base Current IBM -200 mA TA = +25°C 2
Power Dissipation PD 310 mW Note 6 (minimum recommended pad layout, 1oz copper, single-sided FR-4), TA = +25°C 2
Power Dissipation PD 350 mW Note 7 (15mm x 15mm 1oz copper), TA = +25°C 2
Thermal Resistance, Junction to Ambient RθJA 403 °C/W Note 6, TA = +25°C 2
Thermal Resistance, Junction to Ambient RθJA 357 °C/W Note 7, TA = +25°C 2
Thermal Resistance, Junction to Leads RθJL 350 °C/W Note 8 (junction to solder point) 2
Operating and Storage Temperature Range TJ, TSTG -65 150 °C 2
Electrostatic Discharge - Human Body Model ESD HBM 4000 V JEDEC Class 3A (Note 9) 2
Electrostatic Discharge - Machine Model ESD MM 400 V JEDEC Class C (Note 9) 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 (land: KiCad; 3D: generated from the datasheet)

  • Symbol: BC857CQ-7-F
  • Footprint: Package_TO_SOT_SMD:SOT-23-3
  • 3D model: SOT-23-3, generated on the KiCad land (body 1.3 x 2.9 mm, terminals on the pads, 1.025 mm tall, datasheet A, nominal). KiCad's stock model for this land is taller than the datasheet allows, so the model is generated from the datasheet drawing; the dimensions come from the datasheet drawing where it was read and are defaults otherwise (see provenance.model_3d_generated), not the manufacturer's CAD (STEP)
  • 3D model files: bc857cq-7-f-etched.step / bc857cq-7-f-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); bc857cq-7-f.step / bc857cq-7-f.glb are the bare package body.

Provenance

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

  • Datasheet: Diodes Incorporated datasheet (7 pp, sha256 ce26d6bf1b6f9359, retrieved 2026-11-12, tier: manufacturer)
  • 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: land: KiCad official libraries (CC-BY-SA 4.0); 3D: generated from the datasheet's package dimensions (provenance.model_3d_generated).

Datasheet PDF