# 1SMA4757AG

**Shikues** · Zener Diodes · SMA

1SMA4757AG from Shikues, 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 | Cathode | passive | The PINNING table identifies pin 1 as the cathode of the Zener diode; the datasheet gives no further pin-specific electrical limit for this terminal. |
| 2 | Anode | passive | The PINNING table identifies pin 2 as the anode of the Zener diode; the datasheet gives no further pin-specific electrical limit for this terminal. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Shikues |
| 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 (1SMA4757AG, 51 V nominal) | VZT | 48.6 | 51 | 54 | V | at IZT = 5.0 mA; VZT tested with pulses (20 ms) | 2 |
| Maximum dynamic impedance | ZZT |  |  | 95 | Ω | at IZT = 5.0 mA | 2 |
| Reverse current | IR |  |  | 5 | µA | at VR (VR value not reliably recoverable from extracted text) | 2 |
| Power dissipation | PD |  |  | 1 | W | at Tc = 75 °C | 1 |
| Forward voltage | VF |  |  | 1.2 | V | at IF = 200 mA | 1 |
| Junction temperature range | TJ | -55 |  | 150 | °C |  | 1 |
| Storage temperature range | TS | -55 |  | 150 | °C |  | 1 |

## CAD (KiCad official)

- Symbol: `1SMA4757AG`
- Footprint: `Diode_SMD:D_SMA`
- 3D model: SMA (KiCad packages3D, STEP)
- 3D model files: `1sma4757ag-etched.step` / `1sma4757ag-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `1sma4757ag.step` / `1sma4757ag.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Shikues datasheet](docs/1sma4757ag-datasheet.pdf) (3 pp, sha256 `6d97a16d1a7af2a2`, 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/1sma4757ag-datasheet.pdf)