# AO3423A

**UMW** · MOSFETs · SOT-23

AO3423A 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; controls the P-channel MOSFET, with a maximum gate-source voltage of ±12V and operation with gate voltages as low as -2.5V. |
| 2 | S | passive | Source of the P-channel MOSFET. |
| 3 | D | passive | Drain of the P-channel MOSFET, rated for VDS of -20V and continuous drain current of -2A. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | UMW |
| Package | SOT-23 |
| Category | Transistors |
| 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 |  | -1 | V | VDS=VGS, ID=-250µA | 2 |
| Gate-source leakage | IGSS | -10 |  | 10 | µA | VDS=0V, VGS=±12V | 2 |
| Zero gate voltage drain current | IDSS |  |  | -1 | µA | VDS=-20V, VGS=0V | 2 |
| Drain-source on-state resistance | RDS(ON) |  | 59 | 120 | mΩ | VGS=-4.5V, ID=-2A | 2 |
| Drain-source on-state resistance | RDS(ON) |  | 72 | 150 | mΩ | VGS=-2.5V, ID=-1A | 2 |
| Diode forward voltage | VSD |  | -0.8 | -1.2 | V | IS=-1A, VGS=0V | 2 |
| Forward transconductance | gFS |  | 7 |  | S | VDS=-4.5V, ID=-2A | 2 |
| Input capacitance | Ciss |  | 325 |  | pF | VDS=-4.5V, VGS=0V, f=1MHz | 2 |
| Output capacitance | Coss |  | 63 |  | pF | VDS=-4.5V, VGS=0V, f=1MHz | 2 |
| Reverse transfer capacitance | Crss |  | 37 |  | pF | VDS=-4.5V, VGS=0V, f=1MHz | 2 |
| Total gate charge | Qg |  | 3.2 |  | nC | VDS=-10V, VGS=-4.5V, ID=-2A | 2 |
| Gate-source charge | Qgs |  | 0.6 |  | nC | VDS=-10V, VGS=-4.5V, ID=-2A | 2 |
| Gate-drain charge | Qgd |  | 0.9 |  | nC | VDS=-10V, VGS=-4.5V, ID=-2A | 2 |
| Drain-Source Voltage | VDS |  |  | -20 | V | TA=25°C | 1 |
| Gate-Source Voltage | VGS | -12 |  | 12 | V | TA=25°C | 1 |
| Continuous Drain Current | ID |  |  | -2 | A | TA=25°C | 1 |
| Pulsed Drain Current | IDM |  |  | -18 | A | TA=25°C | 1 |
| Power Dissipation | PD |  |  | 1.4 | W | TA=25°C | 1 |
| Operating Junction Temperature | TJ | -55 |  | 150 | °C | TA=25°C | 1 |
| Storage Temperature | TSTG | -55 |  | 150 | °C | TA=25°C | 1 |
| Thermal Resistance from Junction to Ambient | RθJA |  |  | 125 | °C/W | t≤5s | 1 |

## CAD (KiCad official)

- Symbol: `AO3423A`
- Footprint: `Package_TO_SOT_SMD:SOT-23`
- 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files: `ao3423a-etched.step` / `ao3423a-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ao3423a.step` / `ao3423a.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [UMW datasheet](docs/ao3423a-datasheet.pdf) (7 pp, sha256 `1d2e66a29e329883`, retrieved 2026-10-22, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-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/ao3423a-datasheet.pdf)