# 1SMA4772A

**Shandong Jingdao Microelectronics** · Zener Diodes · SMA

1SMA4772A from Shandong Jingdao Microelectronics, in a 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, which is positive relative to the anode in normal reverse-biased zener operation. |
| 2 | Anode | passive | Anode of the zener diode. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Shandong Jingdao Microelectronics |
| Package | 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 |
|---|---|---|---|---|---|---|---|
| Zener Voltage | VZT | 209 | 220 | 231 | V | at IZT = 1.0 mA, pulse 20 ms, Ta=25°C | 2 |
| Dynamic Impedance | ZZT |  |  | 1600 | Ω | at IZT, Ta=25°C | 2 |
| Reverse Current | IR |  |  | 1 | μA | at VR = 165 V | 2 |
| Admissible Zener Current | IZM |  |  | 4.3 | mA | Ta=25°C | 2 |
| Power Dissipation | PD |  |  | 1 | W | at Tc=75°C | 1 |
| Forward Voltage | VF |  |  | 1.2 | V | IF = 200 mA | 1 |
| Junction Temperature Range | TJ | -55 |  | 150 | °C |  | 1 |
| Storage Temperature Range | TS | -55 |  | 150 | °C |  | 1 |
| Zener Test Current | IZT |  | 1 |  | mA | Ta=25°C | 2 |

## CAD (KiCad official)

- Symbol: `1SMA4772A`
- Footprint: `Diode_SMD:D_SMA`
- 3D model: SMA (KiCad packages3D, STEP)
- 3D model files: `1sma4772a-etched.step` / `1sma4772a-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `1sma4772a.step` / `1sma4772a.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Shandong Jingdao Microelectronics datasheet](docs/1sma4772a-datasheet.pdf) (3 pp, sha256 `296be0e2be372196`, 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/1sma4772a-datasheet.pdf)