# SI2305A

**UMW** · MOSFETs · SOT-23

SI2305A 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, with gate-source voltage rated VGS = ±12 V. |
| 2 | S | passive | SOURCE terminal of the -20 V P-channel MOSFET (VDS = -20 V maximum). |
| 3 | D | passive | DRAIN terminal, rated for continuous drain current ID = -4.2 A at TA = 25°C (-3.4 A at TA = 70°C) and pulsed drain current IDM = -10 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 Voltage | VDS |  |  | -20 | V |  | 1 |
| Gate-Source Voltage | VGS | -12 |  | 12 | V |  | 1 |
| Continuous Drain Current | ID |  |  | -4.2 | A | TA=25°C | 1 |
| Continuous Drain Current | ID |  |  | -3.4 | A | TA=70°C | 1 |
| Pulsed Drain Current | IDM |  |  | -10 | A |  | 1 |
| Power Dissipation | PD |  |  | 1.38 | W | TA=25°C | 1 |
| Power Dissipation | PD |  |  | 0.8 | W | TA=70°C | 1 |
| Operating junction and storage temperature range | TJ,TSTG | -55 |  | 150 | °C |  | 1 |
| Thermal Resistance, Junction-to-Ambient | RθJA |  |  | 90 | °C/W |  | 1 |
| Drain-Source Breakdown Voltage | VDSS | -20 |  |  | V | ID=-10µA, VGS=0V | 2 |
| Gate threshold voltage | VGS(th) | -0.5 |  |  | V | VDS=VGS, ID=-250μA | 2 |
| Gate-body leakage | IGSS | -100 |  | 100 | nA | VDS=0V, VGS=±12V | 2 |
| Zero Gate Voltage Drain Current | IDSS |  |  | -1 | µA | VDS=-20V, VGS=0V | 2 |
| Zero Gate Voltage Drain Current | IDSS |  |  | -10 | µA | VDS=-16V, VGS=0V, TJ=55°C | 2 |
| On-state drain current | ID(ON) | -6 |  |  | A | VDS≤-5V, VGS=-4.5V | 2 |
| On-state drain current | ID(ON) | -3 |  |  | A | VDS≤-5V, VGS=-2.5V | 2 |
| Drain-source on-state resistance | RDS(ON) |  |  | 40 | mΩ | VGS=-4.5V, ID=-4.2A | 2 |
| Drain-source on-state resistance | RDS(ON) |  |  | 60 | mΩ | VGS=-2.5V, ID=-3.4A | 2 |
| Continuous source current (diode conduction) | IS |  |  | -1.6 | A |  | 2 |
| Diode forward voltage | VSD |  |  | -1.2 | V | IS=-1.2A, VGS=0V | 2 |

## CAD (KiCad official)

- Symbol: `SI2305A`
- Footprint: `Package_TO_SOT_SMD:SOT-23`
- 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files: `si2305a-etched.step` / `si2305a-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `si2305a.step` / `si2305a.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/8755881142421458944) (7 pp, sha256 `13309e8e915ad4e1`, 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/si2305a-datasheet.pdf)