# 1SMA4739_R1_00001

**PANJIT International** · Zener Diodes · SMA(DO-214AC)

1SMA4739_R1_00001 from PANJIT International, in a SMA(DO-214AC). 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 color band on the package; the zener diode is reverse-biased (cathode positive) for regulation (1SMA4739 nominal Vz 9.1 V at 28 mA). |
| 2 | A | passive | Anode terminal of the zener diode (pin 2 shown as Anode in the package drawing). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | PANJIT International |
| Package | SMA(DO-214AC) |
| 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 | Vz | 8.65 | 9.1 | 9.56 | V | @ IZT = 28 mA | 2 |
| Zener Test Current | IZT |  | 28 |  | mA |  | 2 |
| Maximum Zener Impedance | ZZT |  |  | 5 | Ω | @ IZT = 28 mA | 2 |
| Maximum Zener Impedance (knee) | ZZK |  |  | 700 | Ω | @ IZK = 0.5 mA | 2 |
| Maximum Reverse Leakage Current | IR |  |  | 0.5 | uA | @ VR = 7 V | 2 |
| Standard Zener Voltage Tolerance |  | -5 |  | 5 | % | on nominal zener voltage | 1 |
| Steady State Power Dissipation | PD |  |  | 1 | W | POWER 1 Watt header; Note A mounting | 1 |

## CAD (KiCad official)

- Symbol: `1SMA4739_R1_00001`
- Footprint: `Diode_SMD:D_SMA`
- 3D model: SMA(DO-214AC) (KiCad packages3D, STEP)
- 3D model files: `1sma4739-r1-00001-etched.step` / `1sma4739-r1-00001-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `1sma4739-r1-00001.step` / `1sma4739-r1-00001.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [PANJIT International datasheet](docs/1sma4739-r1-00001-datasheet.pdf) (8 pp, sha256 `7862cf6cc0ea7514`, 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/1sma4739-r1-00001-datasheet.pdf)