# AO3420

**TWGMC** · MOSFETs · SOT-23

AO3420 from TWGMC, 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 | GATE | input | Gate terminal of the N-channel MOSFET; gate-source voltage is rated at ±12 V (VGS). |
| 2 | SOURCE | passive | Source terminal of the N-channel MOSFET; continuous source current is rated at 6.5 A (IS) with pulsed source current at 14 A (ISM). |
| 3 | DRAIN | passive | Drain terminal of the N-channel MOSFET; drain-source voltage is rated at 20 V with continuous drain current of 6.5 A at TC=25℃. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | TWGMC |
| 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 |
|---|---|---|---|---|---|---|---|
| Gate-Source Breakdown Voltage (IGSS test) / Gate-Source Voltage | VGS | -12 |  | 12 | V |  | 1 |
| Drain-Source Voltage | VDS |  |  | 20 | V |  | 1 |
| Drain Current, Continuous | ID |  |  | 6.5 | A | TC=25℃ | 1 |
| Drain Current, Continuous | ID |  |  | 5 | A | TC=100℃ | 1 |
| Drain Current, Pulsed | IDM |  |  | 26.8 | A |  | 1 |
| Power Dissipation | PD |  |  | 1.56 | W | TC=25℃ | 1 |
| Power Dissipation, Derate above 25℃ | PD |  |  | 0.012 | W/℃ |  | 1 |
| Storage Temperature Range | TSTG | -55 |  | 150 | ℃ |  | 1 |
| Operating Junction Temperature Range | TJ | -55 |  | 125 | ℃ |  | 1 |
| Thermal Resistance Junction to ambient | RθJA |  |  | 80 | ℃/W |  | 1 |
| Drain-Source Breakdown Voltage | BVDSS | 20 |  |  | V | VGS=0V , ID=250uA | 2 |
| Drain-Source Leakage Current | IDSS |  |  | 1 | uA | VDS=20V , VGS=0V , TJ=25℃ | 2 |
| Drain-Source Leakage Current | IDSS |  |  | 10 | uA | VDS=16V , VGS=0V , TJ=125℃ | 2 |
| Gate-Source Leakage Current | IGSS | -100 |  | 100 | nA | VGS=±12V , VDS=0V | 2 |
| Static Drain-Source On-Resistance | RDS(ON) |  | 13 | 18 | mΩ | VGS=4.5V , ID=6A | 2 |
| Static Drain-Source On-Resistance | RDS(ON) |  | 14 | 20 | mΩ | VGS=2.5V , ID=5A | 2 |
| Gate Threshold Voltage | VGS(th) | 0.3 | 0.6 | 1 | V | VGS=VDS , ID=250uA | 2 |
| Continuous Source Current | IS |  |  | 6.5 | A | VG=VD=0V , Force Current | 2 |
| Pulsed Source Current | ISM |  |  | 14 | A |  | 2 |
| Diode Forward Voltage | VSD |  |  | 1.2 | V | VGS=0V , IS=1A , TJ=25℃ | 2 |

## CAD (KiCad official)

- Symbol: `AO3420`
- Footprint: `Package_TO_SOT_SMD:SOT-23`
- 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files: `ao3420-etched.step` / `ao3420-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ao3420.step` / `ao3420.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [TWGMC datasheet](docs/ao3420-datasheet.pdf) (5 pp, sha256 `5f45a6202a0649be`, retrieved 2026-10-17, 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/ao3420-datasheet.pdf)