# SF55G

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

SF55G from NH, 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 | NH |
| 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 |
|---|---|---|---|---|---|---|---|
| Maximum repetitive peak reverse voltage | VRRM |  |  | 300 | V |  | 1 |
| Maximum RMS voltage | VRMS |  |  | 210 | V |  | 1 |
| Maximum DC blocking voltage | VDC |  |  | 300 | V |  | 1 |
| Maximum average forward rectified current | IF(AV) |  |  | 5 | A | see fig.1 | 1 |
| Peak forward surge current | IFSM |  |  | 150 | A | 8.3ms single half sine-wave superimposed on rated load (JEDEC method at rated TL) | 1 |
| Storage temperature range | TSTG | -55 |  | 150 | °C |  | 1 |
| Operating junction and storage temperature range | TJ | -55 |  | 150 | °C |  | 1 |
| Maximum instantaneous forward voltage | VF |  |  | 1.25 | V |  | 1 |
| Maximum instantaneous reverse current at rated DC blocking voltage | IR |  |  | 5 | uA | Ta=25℃ | 1 |
| Maximum instantaneous reverse current at rated DC blocking voltage | IR |  |  | 100 | uA | Ta=125℃ | 1 |
| Maximum reverse recovery time | TRR |  |  | 35 | ns | IF=0.5A, IR=1.0A, IRR=0.25A, Ta=25℃ | 1 |

## CAD (KiCad official)

- Symbol: `SF55G`
- 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:** [NH datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8603061056818192384) (5 pp, sha256 `47f17f72a03ed962`, retrieved 2026-10-14, 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/sf55g-datasheet.pdf)