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Infineon Technologies IRFZ44ZL — Discrete Semiconductors

IRFZ44ZL HEXFET N-Channel MOSFET, 55V 51A TO-262

MPNIRFZ44ZL
Obsolete

Infineon HEXFET® IRFZ44ZL, N-Channel MOSFET, 55 V Vdss, 51 A continuous drain, 13.9 mOhm Rds(on) max at 10 V, TO-262-3 (I²Pak) through-hole, -55 to 175 °C junction.

$2.1800Ref. price · indicative, final on quote
Infineon Technologies IRFZ44ZL datasheet (PDF)
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

IRFZ44ZL 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°C51A (Tc)
Power dissipation80W (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, vgs13.9mOhm @ 31A, 10V
Gate charge (Qg) (Max) @ vgs43 nC @ 10 V
Input capacitance (Ciss) (Max) @ vds1420 pF @ 25 V

Product details

What this 55 V, 51 A N-channel HEXFET is for

Typical applications include high-current switching in DC-DC converters, motor drives, battery protection circuits, and automotive under-hood loads where the wide temperature range and low Rds(on) reduce conduction losses.

The TO-262 package (I²Pak variant with long leads) is a through-hole part that sits in the same footprint as a standard TO-220 but with a longer tab for heatsink mounting.

Obsolete — sourcing path for the BOM line

If the design can accept a surface-mount alternative or a different gate-charge profile, a parametric search against the 55 V / 51 A / 13.9 mOhm / TO-262 footprint will identify candidates, but no single drop-in replacement is documented by the manufacturer.

Frequently asked questions

What is the replacement for IRFZ44ZL?

Infineon has not published an official direct replacement order code for the IRFZ44ZL. A functional equivalent would need to match the 55 V Vdss, 51 A continuous drain, 13.9 mOhm Rds(on) max at 10 V, and the through-hole TO-262 package. Without a manufacturer-designated successor, the best approach is a parametric search against those four constraints or to source the original part through independent distribution against an RFQ.

Where can I buy the IRFZ44ZL?

Submit an RFQ for a firm quote and lead-time estimate.