# SI2319A

**UMW** · MOSFETs · SOT-23

SI2319A from UMW, in a SOT-23. 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 | G | input | GATE terminal of the P-channel MOSFET; the datasheet rates the gate-source voltage VGS at ±20 V. |
| 2 | S | passive | SOURCE terminal; the datasheet rates the continuous source-drain diode current IS at -1.25 A. |
| 3 | D | passive | DRAIN terminal; the datasheet rates the drain-source voltage VDS at -40 V and the continuous drain current ID at -4.4 A. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | UMW |
| Package | SOT-23 |
| Category | Transistors/Thyristors |
| Pins | 3 |

## Electrical characteristics

Limits as printed in the datasheet (page.json `metadata.characteristics` carries them as data).

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Drain-source breakdown voltage | V(BR)DSS | -40 |  |  | V | VGS=0V, ID=-250µA | 2 |
| Gate-source threshold voltage | VGS(th) | -1 |  | -3 | V | VDS=VGS, ID=-250µA | 2 |
| Gate-source leakage | IGSS | -100 |  | 100 | nA | VDS=0V, VGS=±20V | 2 |
| Zero gate voltage drain current | IDSS |  |  | -1 | µA | VDS=-40V, VGS=0V | 2 |
| Diode forward voltage | VSD |  | -0.8 | -1.25 | V | IS=-1.25A, VGS=0V | 2 |
| Drain-source on-state resistance | RDS(ON) |  |  | 50 | mΩ | VGS=-10V, ID=-4.4A | 2 |
| Drain-source on-state resistance | RDS(ON) |  |  | 55 | mΩ | VGS=-4.5V, ID=-3.5A | 2 |
| Drain-source voltage | VDS | -40 |  |  | V | TA=25°C | 1 |
| Gate-source voltage | VGS | -20 |  | 20 | V | TA=25°C | 1 |
| Continuous drain current | ID | -4.4 |  |  | A | TA=25°C | 1 |
| Pulsed drain current | IDM | -12 |  |  | A |  | 1 |
| Continuous source-drain diode current | IS | -1.25 |  |  | A | TA=25°C | 1 |
| Power dissipation | PD |  |  | 1.25 | W | TA=25°C | 1 |
| Thermal resistance from junction to ambient | RthJF |  |  | 166 | °C/W | t≤5s | 1 |
| Operating junction temperature | TJ |  |  | 150 | °C |  | 1 |
| Storage temperature | TSTG | -55 |  | 150 | °C |  | 1 |

## CAD (KiCad official)

- Symbol: `SI2319A`
- Footprint: `Package_TO_SOT_SMD:SOT-23`
- 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files: `si2319a-etched.step` / `si2319a-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `si2319a.step` / `si2319a.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [UMW datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8757271595800760320) (9 pp, sha256 `a7ec0647ef8ae345`, retrieved 2026-10-09, 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/si2319a-datasheet.pdf)