# 1SMA4747A

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

1SMA4747A from hongjiacheng, 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 | K | passive | Cathode, the end marked by the cathode line on the body; the zener (reverse) voltage VZ of 19.0 to 21.2 V (20 V nominal) at IZT=47... see review note |
| 2 | A | passive | Anode, the end opposite the cathode line; forward voltage VF is 1.5 V max at IF=200 mA. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | hongjiacheng |
| 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 |
|---|---|---|---|---|---|---|---|
| Nominal zener voltage (min) | VZ | 19 |  |  | V | IZT = 13 mA | 2 |
| Nominal zener voltage | VZ |  | 20 |  | V | IZT = 13 mA | 2 |
| Nominal zener voltage (max) | VZ |  |  | 21.2 | V | IZT = 13 mA | 2 |
| Maximum zener impedance | ZZT |  |  | 22 | Ω | @ IZT = 13 mA | 2 |
| Reverse leakage current | IR |  |  | 5 | μA | @ VR = 15 V | 2 |
| Admissible zener current | IZM |  |  | 47 | mA |  | 2 |
| Power dissipation | PD |  |  | 1000 | mW | Tc=75℃ | 1 |
| Forward voltage | VF |  |  | 1.5 | V | IF=200mA | 1 |
| Storage temperature | Tstg | -55 |  | 150 | ℃ |  | 1 |
| Junction temperature | Tj | -55 |  | 150 | ℃ |  | 1 |
| Typical thermal resistance, junction to ambient | RθJ-A |  | 250 |  | ℃/W |  | 1 |

## CAD (KiCad official)

- Symbol: `1SMA4747A`
- Footprint: `Diode_SMD:D_SMA`
- 3D model: DO-214AC(SMA) (KiCad packages3D, STEP)
- 3D model files: `1sma4747a-etched.step` / `1sma4747a-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `1sma4747a.step` / `1sma4747a.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [hongjiacheng datasheet](docs/1sma4747a-datasheet.pdf) (4 pp, sha256 `a029b6256b4d07a8`, retrieved 2026-10-21, 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/1sma4747a-datasheet.pdf)