# 1SMA4728A-MS

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

1SMA4728A-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; the datasheet pinning table lists pin 1 as Cathode, and the part has a max total power dissipation of 1 W. |
| 2 | A | passive | Anode of the zener diode; the datasheet pinning table lists pin 2 as Anode (printed as 'A node'), and forward voltage is 1.2 V max at IF = 200 mA. |

## 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 |
|---|---|---|---|---|---|---|---|
| Power dissipation | PD |  |  | 1 | W | Tc=75°C | 3 |
| Forward voltage | VF |  |  | 1.2 | V | IF=200 mA | 3 |
| Junction temperature range | TJ | -55 |  | 150 | °C |  | 3 |
| Storage temperature range | TS | -55 |  | 150 | °C |  | 3 |

## CAD (KiCad official)

- Symbol: `1SMA4728A-MS`
- Footprint: `Diode_SMD:D_SMA`
- 3D model: DO-214AC(SMA) (KiCad packages3D, STEP)
- 3D model files: `1sma4728a-ms-etched.step` / `1sma4728a-ms-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `1sma4728a-ms.step` / `1sma4728a-ms.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [MSKSEMI datasheet](docs/1sma4728a-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/1sma4728a-ms-datasheet.pdf)