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Infineon Technologies AUIRFZ44Z — Discrete Semiconductors
Infineon Technologies

AUIRFZ44Z N-Channel MOSFET, 55V 51A TO-220, 13.9mOhm Rds(on)

MPNAUIRFZ44Z
Active

Infineon HEXFET® AUIRFZ44Z, N-Channel MOSFET, 55 V drain-source, 51 A continuous drain current, 13.9 mOhm Rds(on) at 10 V, TO-220 through-hole package, -55 to 175 °C junction temperature.

$0.83Ref. price · indicative, final on quote
AUIRFZ44Z datasheet
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MOQ1 pcs
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Specifications

AUIRFZ44Z Technical Specifications
ParameterValue
SeriesHEXFET®
FET typeN-Channel
Mounting_typeThrough Hole
Operating temperature high-55°C to 175°C(TJ)
Vgs±20 V
Power_w80.0
Package_typeBulk
Capacitance_uf0.0014
Product_statusActive
Supply_voltage_v55.0
Vgs(Th) (Max) @ id4 V @ 250µA
Switching_current_a51.0
Rds on (Max) @ id, vgs13.9mOhm @ 31 A, 10 V
Gate charge (Qg) (Max) @ vgs43 nC @ 10 V

Product details

Through-hole power switch for 55 V rails

The Infineon AUIRFZ44Z is an N-channel enhancement-mode MOSFET from the HEXFET® series, housed in a TO-220 through-hole package.

Gate drive and switching loss budget

The gate threshold is 4 V maximum at 250 µA, but the on-resistance is specified at Vgs = 10 V — a 10 V gate drive is needed to reach the rated 13.9 mOhm. Total gate charge is 43 nC at 10 V, so a driver sourcing 1 A can switch the gate in about 43 ns, not accounting for driver and layout parasitics. Absolute maximum gate-source voltage is ±20 V, so the gate drive must be clamped if the supply rail exceeds 20 V.

175 °C junction — thermal headroom for harsh environments

The 175 °C ceiling provides derating margin compared to 150 °C-rated devices. Power dissipation is rated at 80 W; the TO-220 package with a proper heatsink can handle the thermal load at full current if the duty cycle and ambient are managed.

Frequently asked questions

What is the closest pin-compatible alternative to AUIRFZ44Z?

The AUIRFZ44Z is the automotive-qualified variant of the IRFZ44Z. Both share the same TO-220 pinout and similar ratings — the AUIRFZ44Z carries a 175 °C junction temperature rating versus the standard IRFZ44Z's 175 °C as well. For a direct replacement, confirm the gate charge and Rds(on) match your switching frequency and thermal budget.