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Infineon Technologies IRFZ44NL — Discrete Semiconductors

IRFZ44NL HEXFET N-Channel MOSFET, 55V 49A TO-262

MPNIRFZ44NL
Obsolete

IRFZ44NL, HEXFET N-Channel MOSFET, 55 V drain-source, 49 A continuous drain, 17.5 mOhm Rds(on) max at 25 A, 10 V drive, TO-262 through-hole package, -55 to 175 °C junction temperature.

$1.3100Ref. price · indicative, final on quote
Infineon Technologies IRFZ44NL datasheet (PDF)
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

IRFZ44NL specifications
ParameterValue
SeriesHEXFET®
FET typeN-Channel
MountingThrough Hole
Drain to source voltage55 V
Drive voltage (Max rds on, min rds on)10V
Current - continuous drain (Id) @ 25°C49A (Tc)
Power dissipation3.8W (Ta), 94W (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) @ id4V @ 250µA
Rds on (Max) @ id, vgs17.5mOhm @ 25A, 10V
Gate charge (Qg) (Max) @ vgs63 nC @ 10 V
Input capacitance (Ciss) (Max) @ vds1470 pF @ 25 V

Product details

What the 17.5 mOhm Rds(on) means for your switching design

Date-code provenance matters here: stock surfacing years after the official EOL should be inspected for counterfeits, especially on a high-volume IRFZ44 series part.

Package and temperature range — design-in fit

Housed in a TO-262-3 (I²Pak) through-hole package with long leads, the IRFZ44NL is a direct-fit replacement for TO-220AB footprints where the tab is isolated or the board layout calls for a vertical mount with the drain tab on the back side.

Frequently asked questions

What is the equivalent of IRFZ44NL?

No official successor is listed. The closest functional peer in the same voltage and current class is the IRLZ44N (logic-level gate, lower Rds(on) at 5 V drive), but the IRFZ44NL requires 10 V gate drive for its rated Rds(on). Pin-compatibility depends on package — both are TO-220-family footprints, but the IRFZ44NL uses the TO-262 long-lead variant. For a drop-in replacement, verify the package outline and gate-drive voltage against the IRLZ44N datasheet.