# US1MD

**ST Semtech** · Fast Recovery / High Efficiency Diodes · SMA

US1MD from ST Semtech, in a SMA. 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 | K | passive | Cathode terminal, marked by the color band on the SMA (DO-214AC) body; the US1MD blocks up to 1000 V DC (VRRM 1000 V) and conducts 1 A average forward current. |
| 2 | A | passive | Anode terminal at the end opposite the color band; the maximum forward voltage is 1.7 V at 1 A and the peak forward surge current is 30 A (8.3 ms half sine-wave). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | ST Semtech |
| Package | SMA |
| Category | Diodes |
| Pins | 2 |

## CAD (KiCad official)

- Symbol: `US1MD`
- Footprint: `Diode_SMD:D_SMA`
- 3D model: SMA (KiCad packages3D, STEP)
- 3D model files: `us1md-etched.step` / `us1md-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `us1md.step` / `us1md.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/8588879953992044545) (2 pp, sha256 `166b90d9bd9cbfd3`, retrieved 2026-10-13, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-5-5` (text+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/us1md-datasheet.pdf)