# YFW3404B

**YFW** · MOSFETs · SOT-23

YFW3404B from YFW, 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 ±20 V, with a threshold VGS(th) of 1.2 V min, 1.5 V typ and 2.5 V max at ID=250uA. |
| 2 | S | passive | Source; the body diode runs from source to drain with a continuous forward current IS of 4 A max and VSD of 1.2 V max. |
| 3 | D | passive | Drain; drain-source voltage rating is 30 V, with continuous drain current of 5.8 A at TA=25°C and RDS(ON) of 29 mΩ typ and 38 mΩ max at VGS=10V. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | YFW |
| 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 |  |  | 30 | V |  | 1 |
| Continuous Drain Current | ID |  |  | 5.8 | A | TA=25℃ | 1 |
| Continuous Drain Current | ID |  |  | 2.6 | A | TA=70℃ | 1 |
| Pulsed Drain Current | IDM |  |  | 1.6 | A |  | 1 |
| Power Dissipation | PD |  |  | 1 | W | TA = 25℃ | 1 |
| Thermal Resistance, Junction to Ambient | RθJA |  |  | 125 | °C/W |  | 1 |
| Operating and Storage Temperature Range | TJ ,TSTG | -55 |  | 150 | °C |  | 1 |
| Drain-Source Breakdown Voltage | V(BR)DSS | 30 | 32 |  | V | VGS=0V, ID=250uA | 2 |
| Zero Gate Voltage Drain Current | IDSS |  |  | 1 | μA | VDS=30V, VGS=0V | 2 |
| Gate to Body Leakage Current | IGSS | -100 |  | 100 | nA | VGS=±20V, VDS=0V | 2 |
| Gate-Threshold Voltage | VGS(th) | 1.2 | 1.5 | 2.5 | V | VDS=VGS, ID=250uA | 2 |
| Static Drain-Source on-Resistance | RDS(ON) |  | 29 | 38 | mΩ | VGS=10V, ID=4A | 2 |
| Static Drain-Source on-Resistance | RDS(ON) |  | 45 | 65 | mΩ | VGS=4.5V, ID=3A | 2 |
| Maximum Continuous Drain to Source Diode Forward Current | IS |  |  | 4 | A |  | 2 |
| Maximum Pulsed Drain to Source Diode Forward Current | ISM |  |  | 16 | A |  | 2 |
| Drain to Source Diode Forward Voltage | VSD |  |  | 1.2 | V | VGS=0V, IS=4A | 2 |

## CAD (KiCad official)

- Symbol: `YFW3404B`
- Footprint: `Package_TO_SOT_SMD:SOT-23`
- 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files: `yfw3404b-etched.step` / `yfw3404b-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `yfw3404b.step` / `yfw3404b.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [YFW datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8603184264813441024) (5 pp, sha256 `1c4c681d50798d6c`, retrieved 2026-10-19, 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/yfw3404b-datasheet.pdf)