# SI2305 2305

**YONGYUTAI** · MOSFETs · SOT-23

SI2305 2305 from YONGYUTAI, 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; the datasheet limits the gate-source voltage VGSS to ±8 V. |
| 2 | SOURCE | passive | Source terminal of the P-channel MOSFET; the datasheet gives no pin-specific rating and lists the drain-source voltage VDSS as -12 V for the device. |
| 3 | DRAIN | passive | Drain terminal of the P-channel MOSFET; the datasheet gives no pin-specific rating and lists the continuous drain current as -4.2 A at TA=25℃. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | YONGYUTAI |
| 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 | VDSS |  |  | -12 | V |  | 1 |
| Gate-Source Voltage | VGSS | -8 |  | 8 | V |  | 1 |
| Continuous Drain Current | ID |  |  | -4.2 | A | TA=25℃ | 1 |
| Continuous Drain Current | ID |  |  | -3.4 | A | TA=70℃ | 1 |
| Pulsed Drain current | IDM |  |  | -10 | A |  | 1 |
| Power Dissipation | PD |  |  | 0.35 | W |  | 1 |
| Drain to Source Leakage Current | IDSS |  |  | -1 | uA | VDS=-12V, VGS=0V | 2 |
| Gate-body Leakage | IGSS | -100 |  | 100 | nA | VGS=±8V, VDS=0V | 2 |
| Drain-Source Breakdown Voltage | VDSS | -12 |  |  | V | VGS=0V,ID=-250μA | 2 |
| Static Drain-Source On-resistance | RDS(ON) |  | 32 | 53 | mΩ | VGS=-10V, ID=-4.5A | 2 |
| Static Drain-Source On-resistance | RDS(ON) |  | 40 | 65 | mΩ | VGS=-4.5V, ID=-4.2A | 2 |
| Static Drain-Source On-resistance | RDS(ON) |  | 55 | 100 | mΩ | VGS=-2.5V, ID=-2A | 2 |
| Static Drain-Source On-resistance | RDS(ON) |  | 79 | 250 | mΩ | VGS=-1.8V, ID=-1A | 2 |
| Gate Threshold Voltage | VGS(TH) | -0.5 |  | -0.9 | V | VDS= VGS, ID=-250uA | 2 |
| Diode Forward Voltage | VSD |  |  | -1.2 | V | IS=-1.2A, VGS=0 V | 2 |
| Operating Junction Temperature Range | TJ | -55 |  | 150 | ℃ |  | 1 |
| Storage Temperature Range | TSTG | -55 |  | 150 | ℃ |  | 1 |
| Thermal Resistance Junction to Ambient Air | RθJA |  | 357 |  | ℃/W |  | 1 |
| Thermal Resistance Junction to Lead | RθJL |  | 214 |  | ℃/W |  | 1 |
| Thermal Resistance Junction to Case | RθJC |  | 175 |  | ℃/W |  | 1 |

## Materials and finish

As the datasheet states them (page.json `metadata.appearance`; the 3D model's colours follow it).

| Part | Material | Colour / plating | Datasheet says | Page |
|---|---|---|---|---|
| contacts |  | tin |  Terminals: Matte Tin Plated Leads, Solderable Per MIL-STD-202, Method 208. | 1 |

## CAD (KiCad official)

- Symbol: `SI2305 2305`
- Footprint: `Package_TO_SOT_SMD:SOT-23`
- 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files: `si2305-2305-etched.step` / `si2305-2305-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `si2305-2305.step` / `si2305-2305.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [YONGYUTAI datasheet](docs/si2305-2305-datasheet.pdf) (4 pp, sha256 `a9be269b1b06d116`, retrieved 2026-10-27, 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/si2305-2305-datasheet.pdf)