# SI2301 3A

**KUU** · MOSFETs · SOT-23

SI2301 3A from KUU, 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 of the P-channel TrenchFET; gate-source voltage limited to ±12 V, threshold -0.4 V min to -1 V max at ID=-250 uA. |
| 2 | SOURCE | passive | Source terminal; drain-source voltage rated -20 V and continuous drain current -3 A. |
| 3 | DRAIN | passive | Drain terminal; VDS -20 V max, ID -3 A, with rDS(on) 110 mOhm max at VGS=-4.5 V, ID=-3 A. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | KUU |
| 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=-250uA | 1 |
| Gate-Threshold Voltage | Vth(GS) | -0.4 | -0.7 | -1 | V | VDS= VGS, ID=-250 uA | 1 |
| Gate-body Leakage | IGSS | -100 |  | 100 | nA | VDS=0V, VGS=±12V | 1 |
| Zero Gate Voltage Drain Current | IDSS |  |  | -1 | uA | VDS=-20V, VGS=0V | 1 |
| Drain-Source On-Resistance | rDS(ON) |  | 64 | 110 | mΩ | VGS=-4.5V, ID=-3A | 1 |
| Drain-Source On-Resistance | rDS(ON) |  | 89 | 140 | mΩ | VGS=-2.5V, ID=-2A | 1 |
| Total Gate Charge | Qg |  | 3.3 | 12 | nC |  | 1 |
| Drain-Source voltage | VDS |  |  | -20 | V |  | 1 |
| Gate-Source voltage | VGS | -12 |  | 12 | V |  | 1 |
| Drain current | ID |  |  | -3 | A |  | 1 |
| Power Dissipation | PD |  |  | 1 | W |  | 1 |
| Junction Temperature | Tj |  |  | 150 | ℃ |  | 1 |
| Storage Temperature | Tstg | -55 |  | 150 | ℃ |  | 1 |
| Forward Transconductance | gfs |  | 9.5 |  | s | VDS=-5V, ID=-2.8A | 1 |
| Input Capacitance | Ciss |  | 405 |  | pF |  | 1 |
| Output Capacitance | Coss |  | 75 |  | pF |  | 1 |
| Reverse Transfer Capacitance | Crss |  | 55 |  | pF | VDS=-10V, VGS=0V, f=1MHz | 1 |
| Turn-on Delay Time | td(on) |  | 11 |  | nS |  | 1 |
| Turn-on Rise Time | tr |  | 35 |  | nS |  | 1 |
| Turn-off Delay Time | td(off) |  | 30 |  | nS |  | 1 |
| Turn-off Fall Time | tf |  | 10 |  | nS | VDD=-10V, ID=-1A, VGS=-4.5V, RGEN=10Ω | 1 |
| Gate-Source Charge | Qgs |  | 0.7 |  | nC |  | 1 |
| Gate-Drain Charge | Qgd |  | 1.3 |  | nC | VDS=-10V, ID=-3A, VGS=-2.5V | 1 |
| Diode Forward Voltage | VSD |  | -1.2 |  | V | VGS=0V, ID=-1.3A | 1 |
| Diode Forward Current | Is |  | -1.3 |  | A |  | 1 |

## CAD (KiCad official)

- Symbol: `SI2301 3A`
- Footprint: `Package_TO_SOT_SMD:SOT-23`
- 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files: `si2301-3a-etched.step` / `si2301-3a-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `si2301-3a.step` / `si2301-3a.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [KUU datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8590221556908384256) (2 pp, sha256 `6aa7ca74215ce530`, 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/si2301-3a-datasheet.pdf)