component
FMMT634
Public Made by Adomby adom
YFW Darlington Transistors, SOT-23-3L. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
main
FMMT634
YFW · Darlington Transistors · SOT-23-3L
FMMT634 from YFW, in a SOT-23-3L. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.
Pinout
| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | B | input | Base input of NPN Darlington pair; VBE(on) = 1.50 V typ at VCE = 5 V, IC = 1 A; drives collector current up to 900 mA continuous (ICM 5 A peak). |
| 2 | E | passive | Emitter; BVEBO = 12 V; emitter cut-off current IEBO ≤ 10 nA at VEB = 7 V. |
| 3 | C | output | Collector; BVCEO = 100 V, BVCBO = 120 V; IC max 900 mA continuous, ICM 5 A peak; VCE(sat) ≤ 0.96 V at IC = 900 mA, IB = 5 mA. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | YFW |
| Package | SOT-23-3L |
| Category | Transistors/Thyristors |
| Pins | 3 |
CAD (KiCad official)
- Symbol:
FMMT634 - Footprint:
Package_TO_SOT_SMD:SOT-23-3 - 3D model: SOT-23-3L (KiCad packages3D, STEP)
- 3D model files:
fmmt634-etched.step/fmmt634-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);fmmt634.step/fmmt634.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: YFW datasheet (4 pp, sha256
24a0159b2d5e6073, retrieved 2026-09-18, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins 0.2, primaryclaude-sonnet-4-6(text+vision), consensusclaude-opus-4-7(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).
# FMMT634
**YFW** · Darlington Transistors · SOT-23-3L
FMMT634 from YFW, in a SOT-23-3L. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.
## Pinout
| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | B | input | Base input of NPN Darlington pair; VBE(on) = 1.50 V typ at VCE = 5 V, IC = 1 A; drives collector current up to 900 mA continuous (ICM 5 A peak). |
| 2 | E | passive | Emitter; BVEBO = 12 V; emitter cut-off current IEBO ≤ 10 nA at VEB = 7 V. |
| 3 | C | output | Collector; BVCEO = 100 V, BVCBO = 120 V; IC max 900 mA continuous, ICM 5 A peak; VCE(sat) ≤ 0.96 V at IC = 900 mA, IB = 5 mA. |
## Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | YFW |
| Package | SOT-23-3L |
| Category | Transistors/Thyristors |
| Pins | 3 |
## CAD (KiCad official)
- Symbol: `FMMT634`
- Footprint: `Package_TO_SOT_SMD:SOT-23-3`
- 3D model: SOT-23-3L (KiCad packages3D, STEP)
- 3D model files: `fmmt634-etched.step` / `fmmt634-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `fmmt634.step` / `fmmt634.glb` are the bare package body.
## Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- **Datasheet:** [YFW datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8603387686019751936) (4 pp, sha256 `24a0159b2d5e6073`, retrieved 2026-09-18, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.2`, primary `claude-sonnet-4-6` (text+vision), consensus `claude-opus-4-7` (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/fmmt634-datasheet.pdf)