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BC817-40Q

Public Made by Adom

by adom

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

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3D Model

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Symbol & Footprint

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Datasheet

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Contents

README

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BC817-40Q

Yangzhou Yangjie Elec Tech · Bipolar (BJT) · SOT-23

BC817-40Q from Yangzhou Yangjie Elec Tech, 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 B input Base of the NPN transistor, shown at the bottom left of the SOT-23 symbol on the front page.
2 E passive Emitter of the NPN transistor, shown at the bottom right of the SOT-23 symbol; VEBO is 5 V max.
3 C passive Collector of the NPN transistor, shown at the top of the SOT-23 symbol; VCEO is 45 V, VCBO is 50 V and continuous IC is 500 mA max.

Key specifications

Parameter Value
Manufacturer Yangzhou Yangjie Elec Tech
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-emitter breakdown voltage VCEO 45 V IC=10mAdc, IB=0 2
Collector-base breakdown voltage VCBO 50 V IC=10uAdc, IE=0 2
Emitter-base breakdown voltage VEBO 5 V IE=1.0μAdc, IC=0 2
Emitter cut-off current IEBO 0.1 uAdc VEB=4.0Vdc, IC=0 2
Collector cut-off current ICBO 0.1 uAdc VCB=45Vdc, IE=0 2
DC current gain (BC817-40Q) hFE 250 600 - IC=100mAdc, VCE=1.0Vdc 2
DC current gain hFE 40 - IC=500mAdc, VCE=1.0Vdc 2
Collector-emitter saturation voltage VCE(sat) 0.7 V IC=500mAdc, IB=50mAdc 2
Base-emitter saturation voltage VBE(sat) 1.2 V IC=500mAdc, IB=50mAdc 2
Current gain-bandwidth product fT 100 MHz IC=10mAdc, Vce=5.0Vdc, f=100MHz 2
Collector-emitter voltage VCEO 45 V 1
Collector-base voltage VCBO 50 V 1
Emitter-base voltage VEBO 5 V 1
Collector current, continuous IC 500 mA 1
Total device dissipation PD 300 mW Device mounted on FR-4 PCB 1.0 x 1.0 x 0.06 inch 1
Thermal resistance junction to ambient RthJA 417 K/W Device mounted on FR-4 PCB 1.0 x 1.0 x 0.06 inch 1
Junction temperature Tj -55 150 ℃ 1
Storage temperature TSTG -55 150 ℃ 1

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
housing black 4. Body color: Black 5
contacts tin ● Terminals: Tin plated leads, solderable per J-STD-002 and JESD22-B102 1

CAD (KiCad official)

  • Symbol: BC817-40Q
  • Footprint: Package_TO_SOT_SMD:SOT-23
  • 3D model: SOT-23 (KiCad packages3D, STEP)
  • 3D model files: bc817-40q-etched.step / bc817-40q-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); bc817-40q.step / bc817-40q.glb are the bare package body.

Provenance

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

  • Datasheet: Yangzhou Yangjie Elec Tech datasheet (6 pp, sha256 6526b40fb9456f61, retrieved 2026-10-18, tier: lcsc)
  • 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