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KRC243S-RTK
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KEC Semicon Digital Transistors, SOT-23. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
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KRC243S-RTK
KEC Semicon · Digital Transistors · SOT-23
KRC243S-RTK from KEC Semicon, 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 | COMMON (EMITTER) | passive | Common emitter terminal of the built-in NPN transistor, shared by the internal bias resistor network; the datasheet gives no separate voltage or current limit for this pin. |
| 2 | IN (BASE) | input | Base input, connected to the internal input resistor R1 (4.7 kΩ typical for KRC243S); the input voltage rating is 20 V / −10 V and the input current is at most 1.8 mA at VI = 5 V. |
| 3 | OUT (COLLECTOR) | output | Collector output with a rating of 50 V output voltage and 800 mA maximum output current; output cut-off current is at most 10 µA at VO = 30 V with VI = 0. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | KEC Semicon |
| Package | SOT-23 |
| Category | Transistors/Thyristors |
| Pins | 3 |
CAD (KiCad official)
- Symbol:
KRC243S-RTK - Footprint:
Package_TO_SOT_SMD:SOT-23 - 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files:
krc243s-rtk-etched.step/krc243s-rtk-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);krc243s-rtk.step/krc243s-rtk.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: KEC Semicon datasheet (5 pp, sha256
43f104429e34af23, 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).
# KRC243S-RTK
**KEC Semicon** · Digital Transistors · SOT-23
KRC243S-RTK from KEC Semicon, 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 | COMMON (EMITTER) | passive | Common emitter terminal of the built-in NPN transistor, shared by the internal bias resistor network; the datasheet gives no separate voltage or current limit for this pin. |
| 2 | IN (BASE) | input | Base input, connected to the internal input resistor R1 (4.7 kΩ typical for KRC243S); the input voltage rating is 20 V / −10 V and the input current is at most 1.8 mA at VI = 5 V. |
| 3 | OUT (COLLECTOR) | output | Collector output with a rating of 50 V output voltage and 800 mA maximum output current; output cut-off current is at most 10 µA at VO = 30 V with VI = 0. |
## Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | KEC Semicon |
| Package | SOT-23 |
| Category | Transistors/Thyristors |
| Pins | 3 |
## CAD (KiCad official)
- Symbol: `KRC243S-RTK`
- Footprint: `Package_TO_SOT_SMD:SOT-23`
- 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files: `krc243s-rtk-etched.step` / `krc243s-rtk-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `krc243s-rtk.step` / `krc243s-rtk.glb` are the bare package body.
## Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- **Datasheet:** [KEC Semicon datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8586182782364499968) (5 pp, sha256 `43f104429e34af23`, 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/krc243s-rtk-datasheet.pdf)