# 1SMA4751 R3G

**Taiwan Semiconductor(Taiwan Semicon)** · Zener Diodes · SMA(DO-214AC)

1SMA4751 R3G from Taiwan Semiconductor(Taiwan Semicon), 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 cathode band; for the 1SMA4751 (marking 751A) it is the zener voltage node with nominal Vz of 30 V at IZT of 8.5 mA, ZZT of 40 Ω and IR of 1 µA at VR of 22.8 V. |
| 2 | A | passive | Anode, the terminal opposite the cathode band; it is the reference side of the 30 V nominal zener (1SMA4751) with a 1 W rated device. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Taiwan Semiconductor(Taiwan Semicon) |
| 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 tolerance | Vz | -5 |  | 5 | % | standard tolerance on nominal zener voltage | 2 |
| Nominal zener voltage | Vz |  | 30 |  | V | @ IZT | 2 |
| Zener test current | IZT |  | 8.5 |  | mA |  | 2 |
| Zener impedance | ZZT |  |  | 40 | Ω | @ IZT | 2 |
| Zener impedance (knee) | ZZK |  |  | 1000 | Ω | @ IZK = 0.25 mA | 2 |
| Leakage current | IR |  |  | 1 | μA | @ VR = 22.8 V | 2 |
| Surge current (non-repetitive) | IR |  |  | 150 | mA | 1/2 square wave, 1/120 s, superimposed on IZT | 2 |
| Operating junction temperature range | TJ | -55 |  | 175 | °C |  | 1 |
| Storage temperature range | TSTG | -55 |  | 175 | °C |  | 1 |

## Materials and finish

As the datasheet states them (page.json `metadata.appearance`; the 3D model's colours follow it).

| Part | Material | Colour / plating | Datasheet says | Page |
|---|---|---|---|---|
| contacts |  | tin | Terminal: Matte tin plated leads, solderable per JESD22-B102 Meet JESD 201 class 2 whisker test | 1 |

## CAD (KiCad official)

- Symbol: `1SMA4751 R3G`
- Footprint: `Diode_SMD:D_SMA`
- 3D model: SMA(DO-214AC) (KiCad packages3D, STEP)
- 3D model files: `1sma4751-r3g-etched.step` / `1sma4751-r3g-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `1sma4751-r3g.step` / `1sma4751-r3g.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Taiwan Semiconductor(Taiwan Semicon) datasheet](docs/1sma4751-r3g-datasheet.pdf) (6 pp, sha256 `4542bca42e99dada`, retrieved 2026-10-31, 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/1sma4751-r3g-datasheet.pdf)