# 1SMA4761A

**TWGMC** · Zener Diodes · SMA(DO-214AC)

1SMA4761A from TWGMC, 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 terminal of the unipolar Zener diode; the datasheet gives no pin-specific electrical limits beyond the device ratings (PD 1 W at Tc=75°C, TJ and TS -55 to +150 °C). |
| 2 | Anode | passive | Anode terminal of the unipolar Zener diode; the datasheet gives no pin-specific electrical limits beyond the device ratings (PD 1 W at Tc=75°C, TJ and TS -55 to +150 °C). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | TWGMC |
| 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 (min/nom/max) at IZT | VZT | 71.2 | 75 | 78.8 | V | IZT = 3.3 mA; pulsed 20 ms | 3 |
| Dynamic impedance | ZZT |  |  | 175 | Ω | at IZT = 3.3 mA | 3 |
| Reverse current | IR |  |  | 1 | μA | at VR = 56 V | 3 |
| Admissible Zener current | IZM |  |  | 12 | mA |  | 3 |
| Power dissipation | PD |  |  | 1 | W | Tc = 75 °C | 1 |
| Junction temperature range | TJ | -55 |  | 150 | °C |  | 1 |
| Storage temperature range | TS | -55 |  | 150 | °C |  | 1 |

## CAD (KiCad official)

- Symbol: `1SMA4761A`
- Footprint: `Diode_SMD:D_SMA`
- 3D model: SMA(DO-214AC) (KiCad packages3D, STEP)
- 3D model files: `1sma4761a-etched.step` / `1sma4761a-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `1sma4761a.step` / `1sma4761a.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [TWGMC datasheet](docs/1sma4761a-datasheet.pdf) (4 pp, sha256 `a0e1e0c1e7da0b66`, retrieved 2026-10-21, 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/1sma4761a-datasheet.pdf)