# MMDT3904-JSM

**JSMSEMI** · Bipolar (BJT) · SOT-363

MMDT3904-JSM from JSMSEMI, in a SOT-363. 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 | E1 | passive | Emitter of transistor 1 (NPN); the datasheet gives a collector current rating of 0.2 A per device and an emitter-base voltage limit of 5 V. |
| 2 | B1 | passive | Base of transistor 1 (NPN); emitter-base voltage is limited to 5 V. |
| 3 | C2 | passive | Collector of transistor 2 (NPN); collector-base voltage is limited to 60 V, collector-emitter voltage to 40 V and continuous collector current to 0.2 A. |
| 4 | E2 | passive | Emitter of transistor 2 (NPN); emitter-base voltage is limited to 5 V. |
| 5 | B2 | passive | Base of transistor 2 (NPN); emitter-base voltage is limited to 5 V. |
| 6 | C1 | passive | Collector of transistor 1 (NPN); collector-base voltage is limited to 60 V, collector-emitter voltage to 40 V and continuous collector current to 0.2 A. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | JSMSEMI |
| Package | SOT-363 |
| Category | Transistors/Thyristors |
| Pins | 6 |

## CAD (KiCad official)

- Symbol: `MMDT3904-JSM`
- Footprint: `Package_TO_SOT_SMD:SOT-363_SC-70-6`
- 3D model: SOT-363 (KiCad packages3D, STEP)
- 3D model files: `mmdt3904-jsm-etched.step` / `mmdt3904-jsm-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `mmdt3904-jsm.step` / `mmdt3904-jsm.glb` are the bare package body.

## Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

- **Datasheet:** [JSMSEMI datasheet](docs/mmdt3904-jsm-datasheet.pdf) (3 pp, sha256 `f9d366a25bca20cd`, retrieved 2026-10-27, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-5-5` (vision), consensus `claude-opus-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/mmdt3904-jsm-datasheet.pdf)