# SMA4737A

**ZHIDE** · Zener Diodes · SMA

SMA4737A from ZHIDE, in a 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 color band on the package; Zener voltage 7.5 V nominal (7.13-7.88 V) for SMA4737A, positive with respect to anode in Zener operation. |
| 2 | A | passive | Anode; maximum forward voltage 1.2 V at IF=200 mA. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | ZHIDE |
| Package | 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 |
|---|---|---|---|---|---|---|---|
| Zener Voltage min | VZ | 7.13 | 7.5 | 7.88 | V | @IZT | 3 |
| Test current | IZT |  | 34 |  | mA |  | 3 |
| Maximum Zener impedance | ZZT |  |  | 4 | Ω | @IZT | 3 |
| Maximum Zener impedance at knee | ZZK |  |  | 700 | Ω | @IZK | 3 |
| Knee current | IZK |  | 0.5 |  | mA |  | 3 |
| Maximum reverse leakage current | IR |  |  | 10 | uA | @VR = 5.0 V | 3 |
| Maximum DC Zener current | IZM |  |  | 121 | mA |  | 3 |
| Maximum forward voltage | VF |  |  | 1.2 | V | if=200mA | 1 |
| DC Power dissipation | PD |  |  | 1 | W | TL = 75 °C, lead temp at 3/8'' (9.5mm) from body | 1 |
| Junction temperature range | TJ, TSTG | -55 |  | 150 | ℃ |  | 1 |
| Storage temperature range | TJ, TSTG | -55 |  | 150 | ℃ |  | 1 |

## CAD (KiCad official)

- Symbol: `SMA4737A`
- Footprint: `Diode_SMD:D_SMA`
- 3D model: SMA (KiCad packages3D, STEP)
- 3D model files: `sma4737a-etched.step` / `sma4737a-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `sma4737a.step` / `sma4737a.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [ZHIDE datasheet](docs/sma4737a-datasheet.pdf) (3 pp, sha256 `cb19d95850c9d88e`, 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/sma4737a-datasheet.pdf)