# SF39

**EIC Semicon** · Fast Recovery / High Efficiency Diodes · DO-201AD

SF39 from EIC Semicon, in a DO-201AD. 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, the lead at the colour-band end of the molded body; SF39 has VRRM and VDC of 1000 V and IF(AV) of 3.0 A at Ta = 55 °C. |
| 2 | A | passive | Anode, the lead opposite the colour band; forward current up to 3.0 A average and IFSM of 65 A (8.3 ms half sine), with VF of 4.0 V maximum at IF = 3.0 A for SF38-SF39. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | EIC Semicon |
| Package | DO-201AD |
| Category | Diodes |
| Pins | 2 |

## CAD (KiCad official)

- Symbol: `SF39`
- Footprint: `Diode_THT:D_DO-201AD_P15.24mm_Horizontal`
- 3D model: DO-201AD (KiCad packages3D, STEP)

## Provenance

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

- **Datasheet:** [EIC Semicon datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8590227421879164928) (2 pp, sha256 `ff53c4a05f445421`, 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/sf39-datasheet.pdf)