# 1SMA4742

**SMC(Sangdest Microelectronicstronic (Nanjing))** · Zener Diodes · SMA(DO-214AC)

1SMA4742 from SMC(Sangdest Microelectronicstronic (Nanjing)), 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: the banded/marked end per the datasheet; pad 1 of the KiCad diode footprint. |
| 2 | A | passive | Anode. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | SMC(Sangdest Microelectronicstronic (Nanjing)) |
| 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 |
|---|---|---|---|---|---|---|---|
| Power Dissipation | PD |  |  | 1 | W | TA=25°C, Note 1 (terminals kept at ambient temperature) | 1 |
| Power Derating Above 25°C |  |  |  | 8 | mW/°C | Derate above 25°C | 1 |
| Forward Voltage | VF |  |  | 1.2 | V | IF = 200mA | 1 |
| Typical Thermal Resistance Junction to Ambient | RθJA |  | 120 |  | °C/W | Note 1 | 1 |
| Operating Junction and Storage Temperature Range | TJ,TSTG | -65 |  | 150 | °C |  | 1 |
| Standard Vz Tolerance | Vz | -5 |  | 5 | % | Features list: 5% Standard Vz Tolerance | 1 |

## CAD (KiCad official)

- Symbol: `1SMA4742`
- Footprint: `Diode_SMD:D_SMA`
- 3D model: SMA(DO-214AC) (KiCad packages3D, STEP)
- 3D model files: `1sma4742-etched.step` / `1sma4742-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `1sma4742.step` / `1sma4742.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [SMC(Sangdest Microelectronicstronic (Nanjing)) datasheet](docs/1sma4742-datasheet.pdf) (4 pp, sha256 `dd8c5d3bdc9ab3e4`, retrieved 2026-10-22, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins`, primary `cathode-band convention` (convention), consensus `off` (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/1sma4742-datasheet.pdf)