# SF34

**MDD Microdiode Semiconductor** · Fast Recovery / High Efficiency Diodes · DO-201AD

SF34 from MDD Microdiode Semiconductor, 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 banded/marked end per the datasheet; pad 1 of the KiCad diode footprint. |
| 2 | A | passive | Anode. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | MDD Microdiode Semiconductor |
| Package | DO-201AD |
| 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 (SF34 column) | VRRM |  |  | 200 | V |  | 1 |
| Maximum RMS voltage (SF34 column) | VRMS |  |  | 140 | V |  | 1 |
| Maximum DC blocking voltage (SF34 column) | VDC |  |  | 200 | V |  | 1 |
| Maximum average forward rectified current | I(AV) |  |  | 3 | A | at TA=55℃ | 1 |
| Peak forward surge current | IFSM |  |  | 125 | A | 8.3ms single half sine-wave, superimposed on rated load (JEDEC Method) | 1 |
| Maximum DC reverse current | IR |  |  | 10 | μA | TA=25℃, at rated DC blocking voltage | 1 |
| Maximum DC reverse current | IR |  |  | 50 | μA | TA=100℃, at rated DC blocking voltage | 1 |
| Maximum reverse recovery time | trr |  |  | 35 | ns | NOTE 1: IF=0.5A, IR=1.0A, Irr=0.25A | 1 |
| Typical thermal resistance, junction to ambient | RθJA |  | 30 |  | ℃/W | 0.375in (9.5mm) lead length, P.C.B. mounted (NOTE 3) | 1 |
| Operating junction and storage temperature range | TJ,TSTG | -65 |  | 150 | ℃ |  | 1 |

## CAD (KiCad official)

- Symbol: `SF34`
- 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:** [MDD Microdiode Semiconductor datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588887327984783360) (3 pp, sha256 `f90c5c18eda82958`, 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/sf34-datasheet.pdf)