# AO3423

**KUU** · MOSFETs · SOT-23-3L

AO3423 from KUU, in a SOT-23-3L. 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 of the P-channel MOSFET, ESD protected to 2.0 kV, with a gate-source voltage limit of ±12 V and a threshold of -0.4 V to -1 V. |
| 2 | S | passive | Source of the P-channel MOSFET, connected to the body diode anode side, with continuous drain current of -2 A. |
| 3 | D | passive | Drain of the P-channel MOSFET, rated for a drain-source voltage of -20 V and a pulsed current of -18 A. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | KUU |
| Package | SOT-23-3L |
| 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 |  | -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 = -2.5A | 2 |
| Drain-source on-state resistance | RDS(on) |  | 72 | 150 | mΩ | VGS = -2.5V, ID = -2A | 2 |
| Diode forward voltage | VSD | -0.8 |  | -1.2 | V | IS=1A,VGS=0V | 2 |
| Drain-source voltage | VDS |  |  | -20 | V |  | 1 |
| Gate-source voltage | VGS | -12 |  | 12 | V |  | 1 |
| Continuous Drain Current | ID |  |  | -2 | A |  | 1 |
| Pulsed Diode Current | IDM |  |  | -18 | A |  | 1 |
| Power Dissipation | PD |  |  | 1.4 | W |  | 1 |
| Thermal Resistance from Junction to Ambient | RθJA |  |  | 125 | ℃/W | t≤5s; surface mounted on FR4 board | 1 |
| Operating Junction Temperature | TJ |  |  | 150 | ℃ |  | 1 |
| Storage Temperature | TSTG | -55 |  | 150 | ℃ |  | 1 |

## CAD (KiCad official)

- Symbol: `AO3423`
- Footprint: `Package_TO_SOT_SMD:SOT-23-3`
- 3D model: SOT-23-3L (KiCad packages3D, STEP)
- 3D model files: `ao3423-etched.step` / `ao3423-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ao3423.step` / `ao3423.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [KUU datasheet](docs/ao3423-datasheet.pdf) (3 pp, sha256 `45d86e5650ee5d4c`, retrieved 2026-11-04, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-5-5` (text+vision), consensus `claude-opus-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/ao3423-datasheet.pdf)