component
BC817-40Q
Public Made by Adomby adom
Yangzhou Yangjie Elec Tech Bipolar (BJT), SOT-23. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
Generated by kicad-footprint-generator · KiCad file format 20260206
| Name | Last updated |
|---|---|
| docs | 7d ago |
| viewers | 7d ago |
| bc817-40q-etched.glb | 7d ago |
| bc817-40q-etched.step | 7d ago |
| bc817-40q-hero.glb | 7d ago |
| bc817-40q-hero.overlay.json | 7d ago |
| bc817-40q.glb | 7d ago |
| bc817-40q.kicad_mod | 7d ago |
| bc817-40q.kicad_sym | 7d ago |
| bc817-40q.lbr | 7d ago |
| bc817-40q.step | 7d ago |
| package.json | 7d ago |
| page.json | 7d ago |
| README.md | 7d ago |
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.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);bc817-40q.step/bc817-40q.glbare 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, primaryclaude-sonnet-5-5(text+vision), consensusclaude-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).