# 1SMA4745A-MS

**MSKSEMI** · Zener Diodes · DO-214AC(SMA)

1SMA4745A-MS from MSKSEMI, in a DO-214AC(SMA). 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 | Cathode | passive | Cathode terminal of the zener diode, pinned as 1 in the SMA package outline. |
| 2 | Anode | passive | Anode terminal of the zener diode, pinned as 2 in the SMA package outline. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | MSKSEMI |
| Package | DO-214AC(SMA) |
| 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 zener impedance |  |  |  | 16 | Ω |  | 4 |
| Maximum reverse leakage current |  |  |  | 5 | µA | at VR = 12 V | 4 |
| Maximum zener current |  |  |  | 58 | mA |  | 4 |
| Power dissipation | PD |  |  | 1 | W | Tc = 75 °C | 3 |
| Junction temperature range | TJ | -55 |  | 150 | °C |  | 3 |
| Storage temperature range | TS | -55 |  | 150 | °C |  | 3 |

## CAD (KiCad official)

- Symbol: `1SMA4745A-MS`
- Footprint: `Diode_SMD:D_SMA`
- 3D model: DO-214AC(SMA) (KiCad packages3D, STEP)
- 3D model files: `1sma4745a-ms-etched.step` / `1sma4745a-ms-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `1sma4745a-ms.step` / `1sma4745a-ms.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [MSKSEMI datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8602887619248742400) (6 pp, sha256 `779c5c0d81f9ab38`, retrieved 2026-10-15, 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/1sma4745a-ms-datasheet.pdf)