# AO4409-MS

**MSKSEMI** · MOSFETs · SOP-8

AO4409-MS from MSKSEMI, in a SOP-8. 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 | S | passive | Source of the P-channel MOSFET (VDS = -30V, ID = -15A at VGS = 10V), tied with the other source pins. |
| 2 | S | passive | Source of the P-channel MOSFET (VDS = -30V, ID = -15A at VGS = 10V), tied with the other source pins. |
| 3 | S | passive | Source of the P-channel MOSFET (VDS = -30V, ID = -15A at VGS = 10V), tied with the other source pins. |
| 4 | G | input | Gate of the P-channel MOSFET with VGS rated ±20V and threshold of -1.4V min to -2.7V max at ID = -250 μA. |
| 5 | D | passive | Drain of the P-channel MOSFET (VDS = -30V, pulsed ID -80A), tied with the other drain pins. |
| 6 | D | passive | Drain of the P-channel MOSFET (VDS = -30V, pulsed ID -80A), tied with the other drain pins. |
| 7 | D | passive | Drain of the P-channel MOSFET (VDS = -30V, pulsed ID -80A), tied with the other drain pins. |
| 8 | D | passive | Drain of the P-channel MOSFET (VDS = -30V, pulsed ID -80A), tied with the other drain pins. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | MSKSEMI |
| Package | SOP-8 |
| Category | Triode/MOS Tube/Transistor |
| Pins | 8 |

## 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 |  |  | -30 | V |  | 2 |
| Gate-Source Voltage | VGS | -20 |  | 20 | V |  | 2 |
| Continuous Drain Current | ID |  |  | -15 | A | TA=25°C | 2 |
| Continuous Drain Current | ID |  |  | -12.8 | A | TA=70°C | 2 |
| Pulsed Drain Current | IDM |  |  | -80 | A |  | 2 |
| Avalanche Current | IAS,IAR |  |  | 30 | A |  | 2 |
| Avalanche energy | EAS,EAR |  |  | 135 | mJ | L=0.1mH | 2 |
| Power Dissipation | PD |  |  | 3.1 | W | TA=25°C | 2 |
| Power Dissipation | PD |  |  | 2 | W | TA=70°C | 2 |
| Junction Temperature | TJ |  |  | 150 | ℃ |  | 2 |
| Junction Storage Temperature Range | Tstg | -55 |  | 150 | ℃ |  | 2 |
| Thermal Resistance Junction-to-Ambient | RthJA |  |  | 40 | ℃/W | t ≤ 10s | 2 |
| Thermal Resistance Junction-to-Ambient | RthJA |  |  | 75 | ℃/W | Steady-State | 2 |
| Thermal Resistance Junction-to-Lead | RthJL |  |  | 24 | ℃/W |  | 2 |
| Drain-Source Breakdown Voltage | VDSS | -30 |  |  | V | ID=-250 μA, VGS=0V | 3 |
| Zero Gate Voltage Drain Current | IDSS |  |  | -5 | uA | VDS=-30V, VGS=0V | 3 |
| Zero Gate Voltage Drain Current | IDSS |  |  | -25 | uA | VDS=-30V, VGS=0V, TJ=55℃ | 3 |
| Gate-Body leakage current | IGSS | -100 |  | 100 | nA | VDS=0V, VGS=±20V | 3 |
| Gate Threshold Voltage | VGS(th) | -1.4 |  | -2.7 | V | VDS=VGS, ID=-250 μA | 3 |
| Static Drain-Source On-Resistance | RDS(On) |  |  | 7.5 | mΩ | VGS=-10V, ID=-15A | 3 |
| Static Drain-Source On-Resistance | RDS(On) |  |  | 11.5 | mΩ | VGS=-10V, ID=-15A, TJ=125℃ | 3 |
| Static Drain-Source On-Resistance | RDS(On) |  |  | 12 | mΩ | VGS=-4.5V, ID=-10A | 3 |
| On state drain current | ID(ON) | -80 |  |  | A | VGS=-10V, VDS=-5V | 3 |
| Forward Transconductance | gFS | 35 | 50 |  | S | VDS=-5V, ID=-15A | 3 |
| Input Capacitance | Ciss |  | 5270 | 6400 | pF | VGS=0V, VDS=-15V, f=1MHz | 3 |
| Gate resistance | Rg |  | 2 | 3 | Ω | VGS=0V, VDS=0V, f=1MHz | 3 |
| Total Gate Charge (10V) | Qg |  | 100 | 120 | nC | VGS=-10V, VDS=-15V, ID=-15A | 3 |
| Body Diode Reverse Recovery Time | trr |  | 36.7 | 45 | ns | IF=-15A, dI/dt=100A/us | 3 |
| Maximum Body-Diode Continuous Current | IS |  |  | -5 | A |  | 3 |
| Diode Forward Voltage | VSD |  |  | -1 | V | IS=-1A, VGS=0V | 3 |

## CAD (KiCad official)

- Symbol: `AO4409-MS`
- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`
- 3D model: SOP-8 (KiCad packages3D, STEP)
- 3D model files: `ao4409-ms-etched.step` / `ao4409-ms-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ao4409-ms.step` / `ao4409-ms.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [MSKSEMI datasheet](docs/ao4409-ms-datasheet.pdf) (7 pp, sha256 `e26e907c70dec0a4`, retrieved 2026-11-04, 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/ao4409-ms-datasheet.pdf)