# US2D

**YONGYUTAI** · Diodes - Fast Recovery Rectifiers · SMB(DO-214AA)

US2D from YONGYUTAI, in a SMB(DO-214AA). 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 | YONGYUTAI |
| Package | SMB(DO-214AA) |
| 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 |  |  | 200 | V |  | 1 |
| Maximum RMS voltage | VRMS |  |  | 140 | V |  | 1 |
| Maximum DC blocking voltage | VDC |  |  | 200 | V |  | 1 |
| Maximum average forward rectified current | I(AV) |  |  | 2 | A | at TL=75 C | 1 |
| Peak forward surge current | IFSM |  |  | 50 | A | 8.3ms single half sine-wave superimposed on rated load (JEDEC Method) | 1 |
| Maximum DC reverse current at TA=25 C | IR |  |  | 5 | µA | at rated DC blocking voltage TA=25 C | 1 |
| Maximum DC reverse current at TA=125 C | IR |  |  | 350 | µA | at rated DC blocking voltage TA=125 C | 1 |
| Operating junction and storage temperature range | TJ,TSTG | -50 |  | 150 | °C | Operating junction and storage temperature range | 1 |

## CAD (KiCad official)

- Symbol: `US2D`
- Footprint: `Diode_SMD:D_SMB`
- 3D model: SMB(DO-214AA) (KiCad packages3D, STEP)
- 3D model files: `us2d-etched.step` / `us2d-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `us2d.step` / `us2d.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [YONGYUTAI datasheet](docs/us2d-datasheet.pdf) (2 pp, sha256 `351690202e879343`, retrieved 2026-10-21, 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/us2d-datasheet.pdf)