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Infineon Technologies IRLZ44ZLPBF — Discrete Semiconductors

IRLZ44ZLPBF N-Channel MOSFET, 55V 51A, TO-262

MPNIRLZ44ZLPBF
Obsolete

Infineon HEXFET® IRLZ44ZLPBF, N-Channel MOSFET, 55 V drain-source, 51 A continuous drain, 13.5 mOhm Rds(on) at 10 V, TO-262-3 through-hole package, -55°C to 175°C junction temperature.

Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

IRLZ44ZLPBF specifications
ParameterValue
SeriesHEXFET®
FET typeN-Channel
MountingThrough Hole
Drain to source voltage55 V
Drive voltage (Max rds on, min rds on)4.5V, 10V
Current - continuous drain (Id) @ 25°C51A (Tc)
Power dissipation80W (Tc)
Operating temperature-55°C~175°C(TJ)
PackageTube
Vgs±16V
TechnologyMOSFET (Metal Oxide)
CaseTO-262-3 Long Leads, I²Pak, TO-262AA
Vgs(th) (Max) @ id3V @ 250µA
Rds on (Max) @ id, vgs13.5mOhm @ 31A, 10V
Gate charge (Qg) (Max) @ vgs36 nC @ 5 V
Input capacitance (Ciss) (Max) @ vds1620 pF @ 25 V

Product details

What this HEXFET N-channel MOSFET offers

Total gate charge is 36 nC at 5 V, and input capacitance measures 1620 pF at 25 V drain-source.

The IRLZ44ZLPBF is listed as obsolete.

At 31 A drain current, that resistance drops about 420 mV and dissipates roughly 13 W — well within the 80 W package limit at the case, but the junction-to-case thermal path needs a good heatsink or thermal pad to keep the die below 175°C. The 51 A continuous rating is at 25°C case temperature; derate for higher ambient or limited heatsinking. The logic-level gate threshold (3 V max at 250 µA) means a 5 V microcontroller output can drive it directly, though the 4.5 V minimum drive voltage for rated Rds(on) suggests using a 10 V gate supply for full saturation.

Through-hole TO-262 package — hand-solderable and board-mount considerations

The through-hole mounting means it can be hand-soldered or wave-soldered, which is handy for prototyping or low-volume production. Plan for adequate copper area or an external heatsink to handle the 80 W power dissipation at the case.

Frequently asked questions

Is IRLZ44ZLPBF obsolete?

Yes, the IRLZ44ZLPBF is listed as obsolete. Infineon has discontinued production, and the part is no longer in active manufacturing.

What is the replacement for IRLZ44ZLPBF?

No official replacement order code is provided in the available records. A functionally similar logic-level N-channel MOSFET in a TO-262 package from the same HEXFET family would be the starting point for a substitute evaluation.