# KY2305A

**KY** · MOSFETs · SOT-23

KY2305A from KY, 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 ±12 V, with threshold of -0.4 V min to -1 V max at ID=-250µA. |
| 2 | S | passive | Source of the P-channel MOSFET; body diode forward voltage is -0.9 V typ (-1.2 V max) at IS=-3.3A. |
| 3 | D | passive | Drain; drain-source voltage rated -20 V and continuous drain current -4.1 A (pulsed -16 A). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | KY |
| 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 |  |  | -20 | V |  | 1 |
| Gate-source voltage | VGS | -12 |  | 12 | V |  | 1 |
| Continuous drain current | ID |  |  | -4.1 | A |  | 1 |
| Pulsed drain current | IDM |  |  | -16 | A |  | 1 |
| Maximum power dissipation | PD |  |  | 0.83 | W |  | 1 |
| Thermal resistance, junction to ambient | RθJA |  |  | 150 | ℃/W | t ≤5s | 1 |
| Junction temperature | TJ |  |  | 150 | ℃ |  | 1 |
| Storage temperature | Tstg | -55 |  | 150 | ℃ |  | 1 |
| Drain-source breakdown voltage | V(BR)DSS | -20 | -21.5 |  | V | VGS = 0V, ID =-250µA | 2 |
| Gate-source threshold voltage | VGS(th) | -0.4 | -0.7 | -1 | V | VDS =VGS, ID =-250µA | 2 |
| Gate-source leakage | IGSS | -100 |  | 100 | nA | VDS =0V, VGS =±10V | 2 |
| Zero gate voltage drain current | IDSS |  |  | -1 | µA | VDS =-16V, VGS =0V | 2 |
| Drain-source on-state resistance | RDS(on) |  | 35 | 45 | mΩ | VGS =-4.5V, ID =-3.5A | 2 |
| Drain-source on-state resistance | RDS(on) |  | 38 | 70 | mΩ | VGS =-2.5V, ID =-3A | 2 |
| Drain-source on-state resistance | RDS(on) |  | 50 | 90 | mΩ | VGS =-1.8V, ID =-2A | 2 |
| Body diode voltage | VSD |  | -0.9 | -1.2 | V | IS=-3.3A | 2 |
| Total gate charge | Qg |  | 4.5 | 9 | nC | VDS=-4V, VGS=-2.5V, ID=-4.1A | 2 |
| Turn-on delay time | td(on) |  | 13 | 20 | nS | VDS=-4V, RL=1.2Ω, ID =-3.3A, VGEN=-4.5V, RG=1Ω | 2 |
| Rise time | tr |  | 35 | 53 | nS | VDS=-4V, RL=1.2Ω, ID =-3.3A, VGEN=-4.5V, RG=1Ω | 2 |
| Turn-off delay time | td(off) |  | 32 | 48 | nS | VDS=-4V, RL=1.2Ω, ID =-3.3A, VGEN=-4.5V, RG=1Ω | 2 |
| Fall time | tf |  | 10 | 20 | nS | VDS=-4V, RL=1.2Ω, ID =-3.3A, VGEN=-4.5V, RG=1Ω | 2 |

## CAD (KiCad official)

- Symbol: `KY2305A`
- Footprint: `Package_TO_SOT_SMD:SOT-23`
- 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files: `ky2305a-etched.step` / `ky2305a-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ky2305a.step` / `ky2305a.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [KY datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8590233248979574784) (6 pp, sha256 `3473df775016ea72`, retrieved 2026-10-17, 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/ky2305a-datasheet.pdf)