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Infineon Technologies IRLZ44NPBF — Discrete Semiconductors

IRLZ44NPBF HEXFET N-Channel MOSFET, 55V 47A, TO-220AB

MPNIRLZ44NPBF
Active

IRLZ44NPBF, HEXFET series, N-channel logic-level MOSFET, 55V Vdss, 47A Id, 22mOhm Rds(on) at 10V, 48nC Qg, TO-220AB package, -55°C to 175°C.

$1.4500Ref. price · indicative, final on quote
Infineon Technologies IRLZ44NPBF datasheet (PDF)
PackagingTO-220-3
RoHSROHS3 Compliant
SeriesHEXFET®
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

IRLZ44NPBF specifications
ParameterValue
SeriesHEXFET®
FET typeN-Channel
MountingThrough Hole
Drain to source voltage55 V
Drive voltage (Max rds on, min rds on)4V, 10V
Current - continuous drain (Id) @ 25°C47A (Tc)
Power dissipation3.8W (Ta), 110W (Tc)
Operating temperature-55°C~175°C(TJ)
PackageTube
Vgs±16V
TechnologyMOSFET (Metal Oxide)
CaseTO-220-3
Vgs(th) (Max) @ id2V @ 250µA
Rds on (Max) @ id, vgs22mOhm @ 25A, 10V
Gate charge (Qg) (Max) @ vgs48 nC @ 5 V
Input capacitance (Ciss) (Max) @ vds1700 pF @ 25 V

Product details

The logic-level gate threshold (2 V max at 250 µA) lets a 5 V microcontroller or FPGA drive it directly through a gate resistor — no separate driver IC needed for moderate switching frequencies.

On-resistance and gate charge — sizing the driver and the thermal budget

At 47 A the conduction loss is I²R = 47² × 0.022 ≈ 48.6 W — well within the 110 W case-temperature power dissipation rating, but the junction-to-case thermal path demands a heatsink with adequate surface area and airflow. The total gate charge of 48 nC at 5 V means a 5 V gate driver sourcing 1 A can switch the gate in about 48 ns; a 100 mA source stretches it to 480 ns. Match the drive current to the target switching frequency to keep switching losses under control.

Temperature range and package — where this TO-220AB fits

The TO-220AB through-hole package — three leads, metal tab — bolts directly to a chassis or heatsink with a single M3 screw. The exposed drain tab is electrically live; an insulating pad or thermal compound is needed if the heatsink is grounded.

Frequently asked questions

Is IRLZ44NPBF compatible with 5V logic-level gate drive?

Yes. The maximum gate threshold voltage is 2 V at 250 µA, and the drive voltage for minimum Rds(on) is 10 V, but the part is specified for logic-level drive at 4 V minimum. A 5 V microcontroller output can turn it on fully — the 48 nC gate charge at 5 V is manageable with a 100 mA to 1 A gate driver, depending on the switching frequency.

Can IRLZ44NPBF replace IRLZ44N in existing designs?

The IRLZ44NPBF is the lead-free (PbF) version of the IRLZ44N, with the same 55 V / 47 A rating and TO-220AB package. The electrical specs — Rds(on), gate charge, threshold — are identical. It is a direct drop-in replacement for the IRLZ44N in any design that already uses the leaded variant.