# 3SMA5919B

**YFW** · Zener Diodes · SMA

3SMA5919B 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 | The cathode is the end marked by the color band, per the datasheet polarity note ("Color band denotes cathode end except Bipolar"). The datasheet gives no further electrical limits for this pin. |
| 2 | Anode | passive | The anode is the terminal opposite the cathode band. The datasheet gives no further 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 |
|---|---|---|---|---|---|---|---|
| Nominal Zener voltage (min) | Vz | 5.32 |  |  | V | Ta = 25°C; IZT = 134 mA | 2 |
| Nominal Zener voltage | Vz |  | 5.6 |  | V | Ta = 25°C; IZT = 134 mA | 2 |
| Nominal Zener voltage (max) | Vz |  |  | 5.88 | V | Ta = 25°C; IZT = 134 mA | 2 |
| Maximum DC Zener current | IZM |  |  | 481 | mA | DC | 2 |
| Forward voltage | VF |  |  | 1.5 | V | IF = 200 mA (DC) | 1 |
| Power dissipation | PD |  |  | 3 | W | TC = 75°C | 1 |
| Zener impedance | ZZT |  | 2.5 |  | Ω | @ IZT = 134 mA | 2 |
| Zener impedance (knee) | ZZK |  | 600 |  | Ω | @ IZK = 1 mA | 2 |
| Reverse leakage current | IR |  | 10 |  | μA | @ VR = 2 V | 2 |

## CAD (KiCad official)

- Symbol: `3SMA5919B`
- Footprint: `Diode_SMD:D_SMA`
- 3D model: SMA (KiCad packages3D, STEP)
- 3D model files: `3sma5919b-etched.step` / `3sma5919b-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `3sma5919b.step` / `3sma5919b.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [YFW datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8603387705623658496) (3 pp, sha256 `aded06248980ea68`, retrieved 2026-10-16, 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/3sma5919b-datasheet.pdf)