component
MMBT3904T
Public Made by Adomby adom
CBI Bipolar (BJT), SOT-523. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
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MMBT3904T
CBI · Bipolar (BJT) · SOT-523
MMBT3904T from CBI, in a SOT-523. 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 gives emitter-base breakdown V(BR)EBO of 6 V minimum at IE=10µA and the emitter-base voltage rating VEBO of 6 V. |
| 2 | EMITTER | passive | Emitter terminal of the NPN transistor; the datasheet limits the emitter-base voltage to VEBO 6 V and the collector current to IC 200 mA. |
| 3 | COLLECTOR | passive | Collector terminal of the NPN transistor; the datasheet limits the collector-emitter voltage to VCEO 40 V, collector-base voltage to VCBO 60 V, collector current to 200 mA, and collector power dissipation PC to 150 mW. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | CBI |
| Package | SOT-523 |
| Category | Transistors/Thyristors |
| Pins | 3 |
CAD (KiCad official)
- Symbol:
MMBT3904T - Footprint:
Package_TO_SOT_SMD:SOT-523 - 3D model: SOT-523, generated from the KiCad footprint (body from the F.Fab outline, terminals on the pads, 0.8 mm nominal SOT-523 height). Neither the vendor nor KiCad ships a 3D model for this package, so the dimensions are nominal, not the manufacturer's CAD (STEP)
- 3D model files:
mmbt3904t-etched.step/mmbt3904t-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);mmbt3904t.step/mmbt3904t.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: CBI datasheet (2 pp, sha256
1122ee9cb770e0c0, 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).
# MMBT3904T
**CBI** · Bipolar (BJT) · SOT-523
MMBT3904T from CBI, in a SOT-523. 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 gives emitter-base breakdown V(BR)EBO of 6 V minimum at IE=10µA and the emitter-base voltage rating VEBO of 6 V. |
| 2 | EMITTER | passive | Emitter terminal of the NPN transistor; the datasheet limits the emitter-base voltage to VEBO 6 V and the collector current to IC 200 mA. |
| 3 | COLLECTOR | passive | Collector terminal of the NPN transistor; the datasheet limits the collector-emitter voltage to VCEO 40 V, collector-base voltage to VCBO 60 V, collector current to 200 mA, and collector power dissipation PC to 150 mW. |
## Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | CBI |
| Package | SOT-523 |
| Category | Transistors/Thyristors |
| Pins | 3 |
## CAD (KiCad official)
- Symbol: `MMBT3904T`
- Footprint: `Package_TO_SOT_SMD:SOT-523`
- 3D model: SOT-523, generated from the KiCad footprint (body from the F.Fab outline, terminals on the pads, 0.8 mm nominal SOT-523 height). Neither the vendor nor KiCad ships a 3D model for this package, so the dimensions are nominal, not the manufacturer's CAD (STEP)
- 3D model files: `mmbt3904t-etched.step` / `mmbt3904t-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `mmbt3904t.step` / `mmbt3904t.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/8588943985985392640) (2 pp, sha256 `1122ee9cb770e0c0`, 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/mmbt3904t-datasheet.pdf)