# LM2309

**Leiditech** · MOSFETs · SOT-23

LM2309 from Leiditech, 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 of the P-channel enhancement-mode MOSFET, with a maximum gate-source voltage of ±20 V and a gate threshold of -1 V to -3 V at ID=-250uA. |
| 2 | S | passive | Source of the P-channel MOSFET; the body diode forward drop is at most -1.2 V at IS=-1.2 A. |
| 3 | D | passive | Drain of the P-channel MOSFET, rated for BVDSS of -60 V, continuous ID of -1.6 A and pulsed IDM of -6 A. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Leiditech |
| 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 | BVDSS |  |  | -60 | V |  | 1 |
| Gate-Source Voltage | VGS |  |  | 20 | V |  | 1 |
| Drain Current (continuous) | ID |  |  | -1.6 | A |  | 1 |
| Drain Current (pulsed) | IDM |  |  | -6 | A |  | 1 |
| Total Device Dissipation | PD |  |  | 1000 | mW | TA=25℃ | 1 |
| Junction Temperature | TJ |  |  | 150 | ℃ |  | 1 |
| Storage Temperature | Tstg | -55 |  | 150 | ℃ |  | 1 |
| Drain-Source Breakdown Voltage | BVDSS | -60 |  |  | V | ID = -250uA, VGS=0V | 2 |
| Gate Threshold Voltage | VGS(th) | -1 |  | -3 | V | ID = -250uA, VGS= VDS | 2 |
| Diode Forward Voltage Drop | VSD |  |  | -1.2 | V | IS= -1.2A, VGS=0V | 2 |
| Zero Gate Voltage Drain Current | IDSS |  |  | -10 | uA | VGS=0V, VDS= -60V | 2 |
| Gate Body Leakage | IGSS |  |  | 100 | nA | VGS=+20V, VDS=0V | 2 |
| Static Drain-Source On-State Resistance | RDS(ON) |  | 200 | 250 | mΩ | ID= -1.8A, VGS= -10V | 2 |
| Static Drain-Source On-State Resistance | RDS(ON) |  | 240 | 300 | mΩ | ID= -1.4A, VGS= -4.5V | 2 |
| Input Capacitance | CISS |  | 364 |  | pF | VGS=0V, VDS= -25V, f=1MHz | 2 |
| Output Capacitance | COSS |  | 41 |  | pF | VGS=0V, VDS= -25V, f=1MHz | 2 |
| Turn-ON Time | t(on) |  | 20 |  | ns | VDS= -30V, ID= -1A, RGEN=3.3Ω | 2 |
| Turn-OFF Time | t(off) |  | 5.2 |  | ns | VDS= -30V, ID= -1A, RGEN=3.3Ω | 2 |

## CAD (KiCad official)

- Symbol: `LM2309`
- Footprint: `Package_TO_SOT_SMD:SOT-23`
- 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files: `lm2309-etched.step` / `lm2309-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `lm2309.step` / `lm2309.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Leiditech datasheet](docs/lm2309-datasheet.pdf) (3 pp, sha256 `ee40e0212c92d999`, retrieved 2026-10-28, tier: lcsc)
- **Datasheet language:** Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
- **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/lm2309-datasheet.pdf)