# SMA2Z27A

**YFW** · Zener Diodes · SMA

SMA2Z27A from YFW, 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 | Cathode terminal, identified by the polarity symbol marked on the molded body; the datasheet gives no separate electrical limits for this pin beyond the 2.0 W DC power dissipation at TL = 50 °C (Note 1) for the device. |
| 2 | Anode | passive | Anode terminal, the opposite polarity end of the two-terminal device; the datasheet gives no separate electrical limits for this pin. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | YFW |
| 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 VZ (nominal, min, max) | VZ | 25.65 | 27 | 28.35 | V | @IZT, IZT = 18.5 mA | 2 |
| Maximum zener impedance ZZT | ZZT |  |  | 18 | Ω | @IZT = 18.5 mA | 2 |
| Maximum zener impedance ZZK | ZZK |  |  | 750 | Ω | @IZK = 0.25 mA | 2 |
| Maximum reverse leakage current | IR |  |  | 0.5 | uA | @VR = 20.6 V | 2 |
| Maximum DC zener current | IZM |  |  | 68 | mA |  | 2 |
| Maximum forward voltage | VF |  |  | 1.2 | V | at IF = 200 mA | 1 |
| DC power dissipation | PD |  |  | 2 | W | at TL = 50 °C (Note 1) | 1 |
| Junction temperature range | TJ | -55 |  | 150 | °C |  | 1 |
| Storage temperature range | Ts | -55 |  | 150 | °C |  | 1 |
| Zener voltage tolerance |  | -5 |  | 5 | % | Standard zener voltage tolerance (features list) | 1 |

## CAD (KiCad official)

- Symbol: `SMA2Z27A`
- Footprint: `Diode_SMD:D_SMA`
- 3D model: SMA (KiCad packages3D, STEP)
- 3D model files: `sma2z27a-etched.step` / `sma2z27a-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `sma2z27a.step` / `sma2z27a.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [YFW datasheet](docs/sma2z27a-datasheet.pdf) (4 pp, sha256 `fbbf992c8973accd`, 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/sma2z27a-datasheet.pdf)