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Infineon Technologies IRF7946TRPBF

IRF7946TRPBF MOSFET N-CH 40V 90A DirectFET MX, 1.4 mOhm

MPNIRF7946TRPBF
End of Life

Infineon HEXFET®, StrongIRFET™ IRF7946TRPBF, N-Channel MOSFET, 40 V Vdss, 90 A continuous drain, 1.4 mOhm Rds(on) at 10 V, 212 nC gate charge, DirectFET™ Isometric MX package, -55°C to 150°C junction temperature.

$2.49Ref. price · indicative, final on quote
Infineon Technologies IRF7946TRPBF datasheet (PDF)
PackagingDirectFET™ Isometric MX
RoHSROHS3 Compliant
SeriesHEXFET®, StrongIRFET™
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

IRF7946TRPBF specifications
ParameterValue
SeriesHEXFET®, StrongIRFET™
FET typeN-Channel
MountingSurface Mount
Drain to source voltage40 V
Drive voltage (Max rds on, min rds on)6V, 10V
Current - continuous drain (Id) @ 25°C90A (Tc)
Power dissipation96W (Tc)
Operating temperature-55°C ~ 150°C (TJ)
PackageTape & Reel (TR); Cut Tape (CT)
Vgs±20V
TechnologyMOSFET (Metal Oxide)
CaseDirectFET™ Isometric MX
Vgs(th) (Max) @ id3.9V @ 150µA
Rds on (Max) @ id, vgs1.4mOhm @ 90A, 10V
Gate charge (Qg) (Max) @ vgs212 nC @ 10 V
Input capacitance (Ciss) (Max) @ vds6852 pF @ 25 V

Product details

40 V, 90 A N-channel in a DirectFET can

It comes in the DirectFET Isometric MX package, a low-profile, solderable can that provides low inductance and direct thermal path to the PCB.

Conduction loss and gate drive budget

At 90 A, the I²R loss is about 11.3 W, which must be removed through the DirectFET's solderable pad to the board copper. The 212 nC total gate charge at 10 V means the gate driver needs to source and sink a significant charge per switching cycle — a 1 A driver at 100 kHz would spend about 21% of the period charging the gate, so a higher-current driver or lower switching frequency may be needed.

Thermal and voltage headroom for the rail

Package and PCB layout

The DirectFET Isometric MX package is a surface-mount can with a large solderable drain pad on the bottom and separate source and gate pads.

Frequently asked questions

What is the Rds(on) of IRF7946TRPBF?

This is the value used for conduction loss calculations at rated current.

What package does IRF7946TRPBF use?

It uses the DirectFET Isometric MX package, a surface-mount can-style package with a large solderable drain pad.

Is IRF7946TRPBF RoHS compliant?

Yes, it is ROHS3 compliant per the listing.