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STD123S
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Changjing Bipolar (BJT), SOT-23. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
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STD123S
Changjing · Bipolar (BJT) · SOT-23
STD123S from Changjing, 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 | BASE | input | Base terminal, driven with IB=1mA in the stated on-resistance test (RON 0.6 Ω max) and with IB=50mA for VCE(sat) at IC=500mA, so the base drive must be sufficient for saturation. |
| 2 | EMITTER | passive | Emitter terminal; the datasheet limits emitter-base voltage to VEBO 6.5 V (maximum ratings), with emitter-base breakdown V(BR)EBO of 6.5 V and emitter cut-off current IEBO of 0.1 μA at VEB=6 V. |
| 3 | COLLECTOR | passive | Collector terminal; the datasheet limits VCBO to 20 V, VCEO to 15 V and collector current IC to 1 A, with total collector power dissipation PC of 350 mW. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Changjing |
| Package | SOT-23 |
| Category | Transistors/Thyristors |
| Pins | 3 |
CAD (KiCad official)
- Symbol:
STD123S - Footprint:
Package_TO_SOT_SMD:SOT-23 - 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files:
std123s-etched.step/std123s-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);std123s.step/std123s.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Changjing datasheet (4 pp, sha256
d2e01921cdde9b1b, retrieved 2026-10-09, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-haiku-5-5(text), consensusclaude-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: KiCad official libraries (CC-BY-SA 4.0).
# STD123S
**Changjing** · Bipolar (BJT) · SOT-23
STD123S from Changjing, 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 | BASE | input | Base terminal, driven with IB=1mA in the stated on-resistance test (RON 0.6 Ω max) and with IB=50mA for VCE(sat) at IC=500mA, so the base drive must be sufficient for saturation. |
| 2 | EMITTER | passive | Emitter terminal; the datasheet limits emitter-base voltage to VEBO 6.5 V (maximum ratings), with emitter-base breakdown V(BR)EBO of 6.5 V and emitter cut-off current IEBO of 0.1 μA at VEB=6 V. |
| 3 | COLLECTOR | passive | Collector terminal; the datasheet limits VCBO to 20 V, VCEO to 15 V and collector current IC to 1 A, with total collector power dissipation PC of 350 mW. |
## Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Changjing |
| Package | SOT-23 |
| Category | Transistors/Thyristors |
| Pins | 3 |
## CAD (KiCad official)
- Symbol: `STD123S`
- Footprint: `Package_TO_SOT_SMD:SOT-23`
- 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files: `std123s-etched.step` / `std123s-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `std123s.step` / `std123s.glb` are the bare package body.
## Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- **Datasheet:** [Changjing datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588946693571796992) (4 pp, sha256 `d2e01921cdde9b1b`, retrieved 2026-10-09, tier: lcsc)
- **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:** KiCad official libraries (CC-BY-SA 4.0).
[Datasheet PDF](docs/std123s-datasheet.pdf)