# UMW SS34C

**UMW** · Schottky Diodes · SMC

UMW SS34C from UMW, in a SMC. 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 | C | passive | Cathode, marked by the color band on the JEDEC SMC (DO-214AB) body; the SS34C blocks a maximum DC voltage of 40V. |
| 2 | A | passive | Anode terminal of the Schottky diode; the SS34C has a maximum average forward rectified current of 3.0A. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | UMW |
| Package | SMC |
| 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 |  |  | 40 | V |  | 2 |
| Maximum RMS voltage | VRMS |  |  | 28 | V |  | 2 |
| Maximum DC blocking voltage | VDC |  |  | 40 | V |  | 2 |
| Maximum Average Forward Rectified Current | IF(AV) |  |  | 3 | A | Rating at 25°C ambient temperature unless otherwise specified | 2 |
| Peak Forward Surge Current, 8.3 ms single half sine-wave superimposed on rated load (JEDEC method) | IFSM |  |  | 100 | A | 8.3 ms single half sine-wave superimposed on rated load (JEDEC method) | 2 |
| Maximum instantaneous forward voltage (Note 1) | VF |  |  | 0.5 | V | @ 3.0A, pulse test PW=300 µs, 1% duty cycle | 2 |

## CAD (KiCad official)

- Symbol: `UMW SS34C`
- Footprint: `Diode_SMD:D_SMC`
- 3D model: SMC (KiCad packages3D, STEP)
- 3D model files: `umw-ss34c-etched.step` / `umw-ss34c-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `umw-ss34c.step` / `umw-ss34c.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [UMW datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8757778888380559360) (6 pp, sha256 `9a40f0931cd0a6ac`, retrieved 2026-10-17, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-5-5` (text), consensus `claude-sonnet-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/umw-ss34c-datasheet.pdf)