# SF38G

**FUXINSEMI** · Fast Recovery / High Efficiency Diodes · DO-27

SF38G from FUXINSEMI, in a DO-27. 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 banded/marked end per the datasheet; pad 1 of the KiCad diode footprint. |
| 2 | A | passive | Anode. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | FUXINSEMI |
| Package | DO-27 |
| Category | Diodes |
| Pins | 2 |

## Electrical characteristics

Limits as printed in the datasheet (page.json `metadata.characteristics` carries them as data).

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Repetitive peak reverse voltage | VRRM |  |  | 600 | V |  | 1 |
| RMS voltage | VRMS |  |  | 420 | V |  | 1 |
| Continuous reverse voltage | VR |  |  | 600 | V |  | 1 |
| Maximum forward voltage | VF |  |  | 1.7 | V | IF=3.0A | 1 |
| Forward rectified current | IO |  |  | 3 | A | Ambient temperature = 55°C | 1 |
| Forward surge current | IFSM |  |  | 125 | A | 8.3ms single half sine-wave (JEDEC method) | 1 |
| Reverse current | IR |  |  | 5 | μA | VR=VRRM, TJ=25°C | 1 |
| Reverse current | IR |  |  | 100 | μA | VR=VRRM, TJ=125°C | 1 |
| Operating temperature | T,J | -55 |  | 150 | °C |  | 1 |
| Storage temperature | TSTG | -65 |  | 175 | °C |  | 1 |
| Diode junction capacitance | CJ |  | 50 |  | pF | f=1MHz and applied 4V DC reverse voltage | 1 |
| Thermal resistance junction to ambient | RθJA |  | 20 |  | °C/W |  | 1 |
| Thermal resistance junction to case | RθJC |  | 12 |  | °C/W |  | 1 |
| Thermal resistance junction to lead | RθJL |  | 8 |  | °C/W |  | 1 |

## CAD (KiCad official)

- Symbol: `SF38G`
- Footprint: `Diode_THT:D_DO-27_P15.24mm_Horizontal`
- 3D model: DO-27 (KiCad packages3D, STEP)

## Provenance

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

- **Datasheet:** [FUXINSEMI datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588889664879276032) (4 pp, sha256 `3c897dd6457118d6`, retrieved 2026-10-15, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins`, primary `cathode-band convention` (convention), consensus `off` (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/sf38g-datasheet.pdf)