# IRFB7740PBF

**Infineon Technologies** · MOSFETs · TO-220AB

IRFB7740PBF from Infineon Technologies, in a TO-220AB. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.

## Pinout

| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | G | input | Gate. Insulated MOSFET control terminal; drive with VGS up to ±20V (typ. VGS(th) 2.1-3.7V, use VGS = 10V for full enhancement to RDS(on) typ. 6.0 mΩ). Total gate charge Qg typ. 81 nC at ID = 52A, VDS = 38V. |
| 2 | D | passive | Drain. Power terminal, electrically connected to the TO-220AB metal tab (heatsink). VDSS = 75V max, continuous ID = 87A at TC = 25°C (62A at TC = 100°C), pulsed IDM = 275A. Body diode anode is Source, cathode is Drain (VSD max 1.2V at IS = 52A). |
| 3 | S | passive | Source. Power return terminal and anode of the integral body diode. Continuous IS = 87A, pulsed ISM = 275A. Reference node for VGS and VDS measurements. |
| TAB | D | passive | Metal mounting tab, internally connected to the Drain (pin 2). Used for heatsinking; RθJC = 1.05 °C/W max, RθCS = 0.50 °C/W with flat greased surface. Mounting torque 10 lbf·in (1.1 N·m) with 6-32 or M3 screw. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Infineon Technologies |
| Package | TO-220AB |
| Category | Transistors/Thyristors |
| Pins | 4 |

## Ordering variants

Same part, different packaging or reel option.

- `IRFB7740PbF`

## CAD (KiCad official)

- Symbol: `IRFB7740PBF`
- Footprint: `Package_TO_SOT_THT:TO-220-3_Vertical`
- 3D model: TO-220AB (KiCad packages3D, STEP)
- 3D model files: `irfb7740pbf-etched.step` / `irfb7740pbf-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `irfb7740pbf.step` / `irfb7740pbf.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Infineon Technologies datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588897133471158272) (10 pp, sha256 `6d393c2840083f57`, retrieved 2026-08-17, tier: lcsc)
- **Extractor:** `ds2sf` (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.
- **CAD:** KiCad official libraries (CC-BY-SA 4.0).

[Datasheet PDF](docs/irfb7740pbf-datasheet.pdf)