# MMBD4448SDW

**ST Semtech** · Switching Diodes · SOT-363

MMBD4448SDW from ST Semtech, 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 | A1 | passive | Anode of diode 1; device limits are reverse voltage 80 V and forward continuous current 300 mA at Ta = 25 °C. |
| 2 | C1 | passive | Cathode of diode 1; device limits are reverse voltage 80 V and forward continuous current 300 mA at Ta = 25 °C. |
| 3 | AC2 | passive | Common anode/cathode terminal for diode 2 as labelled AC2; device limits are reverse voltage 80 V and forward continuous current 300 mA at Ta = 25 °C. |
| 4 | A2 | passive | Anode of diode 2; device limits are reverse voltage 80 V and forward continuous current 300 mA at Ta = 25 °C. |
| 5 | C2 | passive | Cathode of diode 2; device limits are reverse voltage 80 V and forward continuous current 300 mA at Ta = 25 °C. |
| 6 | AC1 | passive | Common anode/cathode terminal for diode 1 as labelled AC1; device limits are reverse voltage 80 V and forward continuous current 300 mA at Ta = 25 °C. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | ST Semtech |
| Package | SOT-363 |
| Category | Diodes |
| Pins | 6 |

## CAD (KiCad official)

- Symbol: `MMBD4448SDW`
- Footprint: `Package_TO_SOT_SMD:SOT-363_SC-70-6`
- 3D model: SOT-363 (KiCad packages3D, STEP)
- 3D model files: `mmbd4448sdw-etched.step` / `mmbd4448sdw-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `mmbd4448sdw.step` / `mmbd4448sdw.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [ST Semtech datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8590197070737793024) (3 pp, sha256 `f781793f4b1a2007`, 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/mmbd4448sdw-datasheet.pdf)