component
MMBT5551W
Public Made by Adomby adom
CBI Bipolar (BJT), SOT-323. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
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MMBT5551W
CBI · Bipolar (BJT) · SOT-323
MMBT5551W from CBI, in a SOT-323. 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 | passive | Base terminal of the NPN transistor; the datasheet lists it as pin 1 of the SOT-323 package and gives no pin-specific limit, so the device ratings apply (VEBO 6 V, IC 600 mA maximum). |
| 2 | EMITTER | passive | Emitter terminal of the NPN transistor; the datasheet lists it as pin 2 of the SOT-323 package and gives no pin-specific limit, so the device ratings apply (VEBO 6 V, IC 600 mA maximum). |
| 3 | COLLECTOR | passive | Collector terminal of the NPN transistor; the datasheet lists it as pin 3 of the SOT-323 package and gives no pin-specific limit, so the device ratings apply (VCBO 180 V, VCEO 160 V, IC 600 mA maximum). |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | CBI |
| Package | SOT-323 |
| Category | Transistors/Thyristors |
| Pins | 3 |
CAD (KiCad official)
- Symbol:
MMBT5551W - Footprint:
Package_TO_SOT_SMD:SOT-323_SC-70 - 3D model: SOT-323 (KiCad packages3D, STEP)
- 3D model files:
mmbt5551w-etched.step/mmbt5551w-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);mmbt5551w.step/mmbt5551w.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: CBI datasheet (2 pp, sha256
ebc846392ebbd555, 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).
# MMBT5551W
**CBI** · Bipolar (BJT) · SOT-323
MMBT5551W from CBI, in a SOT-323. 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 | passive | Base terminal of the NPN transistor; the datasheet lists it as pin 1 of the SOT-323 package and gives no pin-specific limit, so the device ratings apply (VEBO 6 V, IC 600 mA maximum). |
| 2 | EMITTER | passive | Emitter terminal of the NPN transistor; the datasheet lists it as pin 2 of the SOT-323 package and gives no pin-specific limit, so the device ratings apply (VEBO 6 V, IC 600 mA maximum). |
| 3 | COLLECTOR | passive | Collector terminal of the NPN transistor; the datasheet lists it as pin 3 of the SOT-323 package and gives no pin-specific limit, so the device ratings apply (VCBO 180 V, VCEO 160 V, IC 600 mA maximum). |
## Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | CBI |
| Package | SOT-323 |
| Category | Transistors/Thyristors |
| Pins | 3 |
## CAD (KiCad official)
- Symbol: `MMBT5551W`
- Footprint: `Package_TO_SOT_SMD:SOT-323_SC-70`
- 3D model: SOT-323 (KiCad packages3D, STEP)
- 3D model files: `mmbt5551w-etched.step` / `mmbt5551w-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `mmbt5551w.step` / `mmbt5551w.glb` are the bare package body.
## Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- **Datasheet:** [CBI datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8590903237350944768) (2 pp, sha256 `ebc846392ebbd555`, 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/mmbt5551w-datasheet.pdf)