# SD03C

**MDD Microdiode Semiconductor** · ESD And Surge Protection (TVS/ESD) · SOD-323

SD03C from MDD Microdiode Semiconductor, in a SOD-323. 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 | 1 | passive | Terminal of the bidirectional TVS diode protecting one I/O line, SD03C VRWM 3.3V and VB 4V min at 1mA. |
| 2 | 2 | passive | Second terminal of the bidirectional TVS diode protecting one I/O line, SD03C VRWM 3.3V and VB 4V min at 1mA. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | MDD Microdiode Semiconductor |
| Package | SOD-323 |
| Category | Circuit Protection |
| 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 |
|---|---|---|---|---|---|---|---|
| Reverse working voltage | VRWM |  |  | 3.3 | V |  | 2 |
| Breakdown voltage | VB | 4 |  |  | V | IT=1 mA | 2 |
| Clamping voltage @1A | VC@1A |  |  | 7.5 | V | 1 A | 2 |
| Clamping voltage | VC |  |  | 16 | V | 20 A | 2 |
| Reverse leakage current | IR |  |  | 40 | µA | at VRWM | 2 |
| Capacitance | CT |  |  | 450 | pF |  | 2 |
| ESD IEC 61000-4-2 (Air) | VESD | -30 |  | 30 | kV | TA=25°C | 1 |
| ESD IEC 61000-4-2 (Contact) | VESD | -30 |  | 30 | kV | TA=25°C | 1 |
| Peak Pulse Power | PPP |  |  | 350 | W | tp=8/20us waveform | 1 |
| Operating Temperature | TOPT | -55 |  | 150 | °C |  | 1 |
| Storage Temperature | TSTG | -55 |  | 150 | °C |  | 1 |
| Lead Solder Temperature | TL |  |  | 260 | °C | 10 second duration | 1 |
| Test current | IT |  | 1 |  | mA |  | 2 |

## Materials and finish

As the datasheet states them (page.json `metadata.appearance`; the 3D model's colours follow it).

| Part | Material | Colour / plating | Datasheet says | Page |
|---|---|---|---|---|
| contacts |  | tin |  Terminal: Matte tin plated. The SDxxC Series is designed for applications requiring transient overvoltage protection | 1 |

## CAD (KiCad official)

- Symbol: `SD03C`
- Footprint: `Diode_SMD:D_SOD-323`
- 3D model: SOD-323 (KiCad packages3D, STEP)
- 3D model files: `sd03c-etched.step` / `sd03c-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `sd03c.step` / `sd03c.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [MDD Microdiode Semiconductor datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8757912215192387584) (4 pp, sha256 `e2622908f09e265f`, retrieved 2026-10-22, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-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/sd03c-datasheet.pdf)