# 1SMA4746A-MS

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

1SMA4746A-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 of the zener diode; connected to the positive side in reverse-biased zener regulation (18 V nominal zener voltage for the 1SMA4746A-MS). |
| 2 | A | passive | Anode of the zener diode; connected to the negative/ground side in reverse-biased zener regulation. |

## 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 |
|---|---|---|---|---|---|---|---|
| Forward voltage | VF |  |  | 1.2 | V | IF = 200 mA | 3 |
| 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 |
| Zener test current | Izt |  | 14 |  | mA |  | 4 |
| Dynamic impedance | Zzt |  |  | 20 | Ω |  | 4 |
| Reverse leakage current | IR |  |  | 5 | µA |  | 4 |
| Reverse voltage for IR | VR |  | 13 |  | V |  | 4 |
| Maximum zener current | Izm |  |  | 52 | mA |  | 4 |

## CAD (KiCad official)

- Symbol: `1SMA4746A-MS`
- Footprint: `Diode_SMD:D_SMA`
- 3D model: DO-214AC(SMA) (KiCad packages3D, STEP)
- 3D model files: `1sma4746a-ms-etched.step` / `1sma4746a-ms-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `1sma4746a-ms.step` / `1sma4746a-ms.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [MSKSEMI datasheet](docs/1sma4746a-ms-datasheet.pdf) (6 pp, sha256 `779c5c0d81f9ab38`, 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/1sma4746a-ms-datasheet.pdf)