# FS4435

**FOSAN** · MOSFETs · SOP-8

FS4435 from FOSAN, 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, tied to pins 2 and 3; drain-source breakdown voltage is -30 V. |
| 2 | S | passive | Source of the P-channel MOSFET, tied to pins 1 and 3 externally. |
| 3 | S | passive | Source of the P-channel MOSFET, tied to pins 1 and 2 externally. |
| 4 | G | input | Gate of the P-channel MOSFET, with maximum gate-source voltage of ±20 V and threshold of -1 V to -2.5 V. |
| 5 | D | passive | Drain of the P-channel MOSFET, tied to pins 6, 7 and 8; continuous drain current is -10 A at TA = 25°C. |
| 6 | D | passive | Drain of the P-channel MOSFET, tied to pins 5, 7 and 8 externally. |
| 7 | D | passive | Drain of the P-channel MOSFET, tied to pins 5, 6 and 8 externally. |
| 8 | D | passive | Drain of the P-channel MOSFET, tied to pins 5, 6 and 7 externally; pulsed drain current is -20 A. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | FOSAN |
| Package | SOP-8 |
| Category | Transistors/Thyristors |
| 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 | BVDSS |  |  | -30 | V |  | 1 |
| Gate-Source Voltage | VGS |  |  | 20 | V |  | 1 |
| Drain Current (continuous) | ID |  |  | -10 | A | TA = 25°C | 1 |
| Drain Current (pulsed) | IDM |  |  | -20 | A |  | 1 |
| Total Device Dissipation | PTOT |  |  | 2 | W | TA = 25°C | 1 |
| Thermal Resistance Junction-Ambient | RΘJA |  |  | 62 | ℃/W |  | 1 |
| Junction/Storage Temperature | TJ,Tstg | -55 |  | 150 | ℃ |  | 1 |
| Drain-Source Breakdown Voltage | BVDSS | -30 |  |  | V | ID = -250uA, VGS=0V | 2 |
| Gate Threshold Voltage | VGS(th) | -1 | -1.8 | -2.5 | V | ID = -250uA, VGS = VDS | 2 |
| Zero Gate Voltage Drain Current | IDSS |  |  | -1 | uA | VGS=0V, VDS= -24V | 2 |
| Gate Body Leakage | IGSS |  |  | 100 | nA | VGS=+20V, VDS=0V | 2 |
| Static Drain-Source On-State Resistance | RDS(ON) |  | 18 | 25 | mΩ | ID= -10A, VGS= -10V | 2 |
| Static Drain-Source On-State Resistance | RDS(ON) |  | 22 | 32 | mΩ | ID= -6A, VGS= -4.5V | 2 |
| Diode Forward Voltage Drop | VSD |  | -0.8 | -1.2 | V | ISD= -1A, VGS=0V | 2 |

## CAD (KiCad official)

- Symbol: `FS4435`
- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`
- 3D model: SOP-8 (KiCad packages3D, STEP)
- 3D model files: `fs4435-etched.step` / `fs4435-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `fs4435.step` / `fs4435.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [FOSAN datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8757317939454726144) (5 pp, sha256 `213d47acbc32c134`, retrieved 2026-10-17, 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/fs4435-datasheet.pdf)