# AO3442

**Alpha Omega Semicon** · MOSFETs · SOT-23

AO3442 from Alpha Omega Semicon, 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; gate-source voltage limited to ±20 V, with VGS(th) of 1.7 V min, 2.3 V typ and 2.9 V max at ID=250µA. |
| 2 | S | passive | Source; body-diode continuous current is 1 A and junction-to-lead thermal resistance is 63 °C/W typ (80 max). |
| 3 | D | passive | Drain; drain-source voltage is 100 V max, continuous current is 1 A at TA=25°C and pulsed current is 4 A. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Alpha Omega Semicon |
| 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 |  |  | 100 | V |  | 1 |
| Gate-Source Voltage | VGS | -20 |  | 20 | V |  | 1 |
| Continuous Drain Current | ID |  |  | 1 | A | TA=25°C | 1 |
| Continuous Drain Current | ID |  |  | 0.8 | A | TA=70°C | 1 |
| Pulsed Drain Current | IDM |  |  | 4 | A |  | 1 |
| Power Dissipation | PD |  |  | 1.4 | W | TA=25°C | 1 |
| Power Dissipation | PD |  |  | 0.9 | W | TA=70°C | 1 |
| Junction and Storage Temperature Range | TJ, TSTG | -55 |  | 150 | °C |  | 1 |
| Drain-Source Breakdown Voltage | BVDSS | 100 |  |  | V | ID=250µA, VGS=0V | 2 |
| Zero Gate Voltage Drain Current | IDSS |  |  | 1 | µA | VDS=100V, VGS=0V | 2 |
| Zero Gate Voltage Drain Current | IDSS |  |  | 5 | µA | TJ=55°C | 2 |
| Gate-Body Leakage Current | IGSS | -100 |  | 100 | nA | VDS=0V, VGS=±20V | 2 |
| Gate Threshold Voltage | VGS(th) | 1.7 | 2.3 | 2.9 | V | VDS=VGS, ID=250µA | 2 |
| On State Drain Current | ID(ON) | 4 |  |  | A | VGS=10V, VDS=5V | 2 |
| Static Drain-Source On-Resistance | RDS(ON) |  | 514 | 630 | mΩ | VGS=10V, ID=1A | 2 |
| Static Drain-Source On-Resistance | RDS(ON) |  | 983 | 1200 | mΩ | TJ=125°C | 2 |
| Static Drain-Source On-Resistance | RDS(ON) |  | 554 | 720 | mΩ | VGS=4.5V, ID=0.8A | 2 |
| Diode Forward Voltage | VSD |  | 0.9 | 1.2 | V | IS=1A, VGS=0V | 2 |
| Maximum Body-Diode Continuous Current | IS |  |  | 1 | A |  | 2 |
| Gate Resistance | Rg | 2.5 | 5 | 7.5 | Ω | VGS=0V, VDS=0V, f=1MHz | 2 |
| Total Gate Charge | Qg (10V) |  | 2.8 | 6 | nC | VGS=10V, VDS=50V, ID=1A | 2 |
| Total Gate Charge | Qg (4.5V) |  | 1.5 | 3 | nC | VGS=4.5V | 2 |
| Maximum Junction-to-Ambient | RθJA |  | 70 | 90 | °C/W |  | 1 |

## CAD (KiCad official)

- Symbol: `AO3442`
- Footprint: `Package_TO_SOT_SMD:SOT-23`
- 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files: `ao3442-etched.step` / `ao3442-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ao3442.step` / `ao3442.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Alpha Omega Semicon datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8586180041818038272) (5 pp, sha256 `88bee0179b6eeb39`, retrieved 2026-10-09, 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/ao3442-datasheet.pdf)