# 1SMA4740A

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

1SMA4740A 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, marked by the cathode line on the package; zener voltage 10V nominal (9.50-10.5V) at IZT=25mA for the 1SMA4740A. |
| 2 | A | passive | Anode terminal of the zener diode; forward voltage 1.5V max at IF=200mA. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | hongjiacheng |
| Package | DO-214AC(SMA) |
| Category | Diodes |
| Pins | 2 |

## CAD (KiCad official)

- Symbol: `1SMA4740A`
- Footprint: `Diode_SMD:D_SMA`
- 3D model: DO-214AC(SMA) (KiCad packages3D, STEP)
- 3D model files: `1sma4740a-etched.step` / `1sma4740a-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `1sma4740a.step` / `1sma4740a.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [hongjiacheng datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8755887623632236544) (4 pp, sha256 `a029b6256b4d07a8`, retrieved 2026-10-12, 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/1sma4740a-datasheet.pdf)