# 1SMA4738_R1_00001

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

1SMA4738_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, the end marked by the color band; zener voltage for 1SMA4738 is 8.2 V nominal (7.79 V to 8.61 V) at IZT = 31 mA. |
| 2 | A | passive | Anode terminal of the zener diode; the 1SMA4738 is rated for 1 W power dissipation. |

## 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 |
|---|---|---|---|---|---|---|---|
| Zener Voltage | VZ | 7.79 | 8.2 | 8.61 | V | @ IZT = 31 mA | 2 |
| Zener Voltage Tolerance |  | -5 |  | 5 | % | standard tolerance on nominal zener voltage (Note C) | 1 |
| Maximum Zener Impedance | ZZT |  |  | 4.5 | Ω | @ IZT = 31 mA | 2 |
| Maximum Zener Impedance (knee) | ZZK |  |  | 700 | Ω | @ IZK = 0.5 mA | 2 |
| Maximum Reverse Leakage Current | IR |  |  | 5 | uA | @ VR = 6 V | 2 |
| Peak Power Dissipation | PD |  |  | 1 | W | TA = 50°C (Note A) | 1 |
| Peak Forward Surge Current | IFSM |  |  | 10 | A | 8.3ms single half sine-wave superimposed on rated load | 1 |

## CAD (KiCad official)

- Symbol: `1SMA4738_R1_00001`
- Footprint: `Diode_SMD:D_SMA`
- 3D model: SMA(DO-214AC) (KiCad packages3D, STEP)
- 3D model files: `1sma4738-r1-00001-etched.step` / `1sma4738-r1-00001-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `1sma4738-r1-00001.step` / `1sma4738-r1-00001.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [PANJIT International datasheet](docs/1sma4738-r1-00001-datasheet.pdf) (8 pp, sha256 `89c9fddfd1cadaf4`, 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/1sma4738-r1-00001-datasheet.pdf)