# 1SMA4737_R1_00001

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

1SMA4737_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 | Cathode | passive | Cathode of the 1SMA4737 zener diode, marked by the color band at the cathode end of the SMA body, with the device rated at 1 W and derated above 50°C per the datasheet. |
| 2 | Anode | passive | Anode of the 1SMA4737 zener diode, the terminal opposite the color-banded cathode, for a device with junction and storage temperature range of -55 to +150°C. |

## 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 (Nom.) for 1SMA4737 |  |  | 7.5 |  | V | Nominal zener voltage; test current IZT 34 mA | 2 |
| Zener Voltage, Min |  | 7.13 |  |  | V | At IZT 34 mA | 2 |
| Zener Voltage, Max |  |  |  | 7.88 | V | At IZT 34 mA | 2 |
| Zener voltage tolerance (standard) |  | -5 |  | 5 | % | Standard tolerance on nominal zener voltage per note C; no tolerance letter in this MPN | 1 |
| Maximum Zener Impedance ZZT | Z |  |  | 4 | Ω | At IZT 34 mA | 2 |
| Maximum Zener Impedance ZZK | Z |  |  | 700 | Ω | At IZK 0.5 mA | 2 |
| Maximum Reverse Leakage Current | IR |  |  | 5 | uA | At VR 5 V | 2 |
| Power rating |  |  |  | 1 | W | Rated power as printed in header (POWER 1 Watt); ratings at 25°C ambient | 1 |

## CAD (KiCad official)

- Symbol: `1SMA4737_R1_00001`
- Footprint: `Diode_SMD:D_SMA`
- 3D model: SMA(DO-214AC) (KiCad packages3D, STEP)
- 3D model files: `1sma4737-r1-00001-etched.step` / `1sma4737-r1-00001-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `1sma4737-r1-00001.step` / `1sma4737-r1-00001.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [PANJIT International datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588918464395792384) (8 pp, sha256 `ce9ae7ae60febaf2`, retrieved 2026-10-13, 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/1sma4737-r1-00001-datasheet.pdf)