IRFSL7440PBF

Infineon Technologies · HEXFET®, StrongIRFET™ Series

Infineon IRFSL7440PBF, HEXFET® StrongIRFET™ N-Channel MOSFET, 40 V Vdss, 120 A Id, 2.5 mOhm Rds(on), TO-262-3 (I²Pak) through-hole, -55°C to 175°C.

Infineon Technologies IRFSL7440PBF
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Technical specifications

IRFSL7440PBF specifications
Parameter / AttributeSpecification / Value
SeriesHEXFET®, StrongIRFET™
FET typeN-Channel
MountingThrough Hole
Drain to source voltage40 V
Drive voltage (Max rds on, min rds on)6V, 10V
Current - continuous drain (Id) @ 25°C120A (Tc)
Power dissipation208W (Tc)
Operating temperature-55°C ~ 175°C (TJ)
PackageTube
Vgs±20V
TechnologyMOSFET (Metal Oxide)
CaseTO-262-3 Long Leads, I²Pak, TO-262AA
Vgs(th) (Max) @ id3.9V @ 100µA
Rds on (Max) @ id, vgs2.5mOhm @ 100A, 10V
Gate charge (Qg) (Max) @ vgs135 nC @ 10 V
Input capacitance (Ciss) (Max) @ vds4730 pF @ 25 V

Technical details

The 2.5 mOhm maximum on-resistance at 100 A, 10 V gate drive sets the conduction loss floor for a high-current switch — at 100 A the dissipation is 25 W, which the 208 W package rating can handle with adequate heatsinking.

Gate charge and drive budget

Total gate charge is 135 nC at 10 V.

Through-hole TO-262 — thermal and mechanical fit

The TO-262-3 (I²Pak, TO-262AA) package has long leads for through-hole mounting. The junction-to-case thermal resistance is not listed here, but the 208 W dissipation rating at 25°C case implies a low RthJC, typical for this package class.

This makes the part suitable for high-reliability and harsh-environment applications such as automotive under-hood, industrial motor drives, and power converters where ambient temperatures exceed 85°C. The 175°C maximum junction allows headroom for high-current operation with thermal cycling.

ROHS3 compliant (lead-free). The series is HEXFET and StrongIRFET, both established Infineon power MOSFET families with broad distribution support.

IRFSL7440PBF
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