# SI2301A

**UMW** · MOSFETs · SOT-23

SI2301A from UMW, in a SOT-23. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.

## Pinout

| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | G | input | Gate input, ±12V rated, with gate-source leakage current of ±100nA maximum at VDS=0V, VGS=±8V. |
| 2 | S | passive | Source terminal with integrated body diode; maximum continuous source-drain diode current of -0.72A. |
| 3 | D | passive | Drain terminal, rated for -20V VDS maximum with continuous drain current of -2.8A and on-state resistance RDS(ON) <0.08Ω at VGS=-4.5V. |

## 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 | -20 |  |  | V | VGS=0V, ID=-250µA | 2 |
| Gate-source threshold voltage | VGS(th) | -0.4 | -0.8 | -1 | V | VDS=VGS, ID=-250µA | 2 |
| Gate-source leakage | IGSS | -100 |  | 100 | nA | VDS=0V, VGS=±8V | 2 |
| Zero gate voltage drain current | IDSS |  |  | -1 | µA | VDS=-20V, VGS=0V | 2 |
| Drain-source on-state resistance | RDS(ON) |  | 0.065 | 0.08 | Ω | VGS=-4.5V, ID=-2.8A | 2 |
| Drain-source on-state resistance | RDS(ON) |  | 0.07 | 0.09 | Ω | VGS=-2.5V, ID=-2A | 2 |
| Forward transconductance | gFS |  | 6.5 |  | S | VDS=-5V, ID=-2.8A | 2 |
| Input Capacitance | Ciss |  | 405 |  | pF | VDS=-10V, VGS=0V, f=1MHz | 2 |
| Output Capacitance | Coss |  | 75 |  | pF | VDS=-10V, VGS=0V, f=1MHz | 2 |
| Reverse Transfer Capacitance | Crss |  | 55 |  | pF | VDS=-10V, VGS=0V, f=1MHz | 2 |
| Drain-Source Voltage | VDS | -20 |  |  | V | TA=25°C | 1 |
| Gate-Source Voltage | VGS | -12 |  | 12 | V |  | 1 |
| Continuous Drain Current | ID | -2.8 |  |  | A | TA=25°C | 1 |
| Pulsed Drain Current | IDM | -12 |  |  | A |  | 1 |
| Continuous Source-Drain Diode Current | IS | -0.72 |  |  | A |  | 1 |
| Maximum Power Dissipation | PD |  |  | 0.4 | W |  | 1 |
| Thermal Resistance from Junction to Ambient | RθJA |  |  | 125 | °C/W | t≤5s | 1 |
| Junction Temperature | TJ |  |  | 150 | °C |  | 1 |
| Storage Temperature | TSTG | -55 |  | 150 | °C |  | 1 |

## CAD (KiCad official)

- Symbol: `SI2301A`
- Footprint: `Package_TO_SOT_SMD:SOT-23`
- 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files: `si2301a-etched.step` / `si2301a-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `si2301a.step` / `si2301a.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/8755881121634758656) (6 pp, sha256 `4750ec752e6044e8`, retrieved 2026-09-21, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.2`, primary `claude-haiku-4-5-20251001` (text), consensus `claude-sonnet-4-6` (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/si2301a-datasheet.pdf)