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Infineon Technologies AUIRLZ44ZL — Discrete Semiconductors

AUIRLZ44ZL MOSFET N-Ch 55V 51A TO-220AB, AEC-Q101

MPNAUIRLZ44ZL
Active

Infineon AUIRLZ44ZL N-Channel MOSFET, 55 V, 51 A, 13.5 mOhm Rds(on) @ 31 A, 10 V, TO-220AB, AEC-Q101 qualified, HEXFET series, -55 to 175 °C junction temperature.

$0.76Ref. price · indicative, final on quote
Infineon Technologies AUIRLZ44ZL datasheet (PDF)
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

AUIRLZ44ZL specifications
ParameterValue
SeriesAutomotive, AEC-Q101, HEXFET®
FET typeN-Channel
MountingThrough Hole
Operating temperature high-55°C to 175°C(TJ)
Vgs±16 V
Power80.0
Package_typeBulk
Capacitance_uf0.0016
StatusActive
Supply voltage55.0
Vgs(Th) (Max) @ id3 V @ 250µA
Switching current51.0
Rds on (Max) @ id, vgs13.5mOhm @ 31 A, 10 V
Gate charge (Qg) (Max) @ vgs36 nC @ 5 V

Product details

N-channel 55 V logic-level MOSFET for automotive and industrial switching

The Infineon AUIRLZ44ZL is an N-channel logic-level power MOSFET in the HEXFET series, rated at 55 V drain-source breakdown and 51 A continuous drain current, housed in a TO-220AB through-hole package. It is AEC-Q101 qualified, making it suited for automotive powertrain, transmission control, and electric power-steering applications where junction temperatures can reach 175 °C. Gate charge is 36 nC at 5 V, which means a modest gate driver can switch this part at moderate frequencies without excessive drive power. The maximum gate-source voltage is ±16 V — exceeding that during overshoot or ringing damages the oxide; ensure the drive circuit clamps within that window.

The manufacturer lists the AUIRLZ44ZL as Active (current production). Because it is a current-production automotive-grade MOSFET, date-code freshness and full AEC-Q101 traceability are expected from authorized supply. Any surplus stock surfacing far outside the normal production window should be verified for counterfeit risk.

Frequently asked questions

Is AUIRLZ44ZL automotive grade?

Yes, it is in the Automotive series and AEC-Q101 qualified, which means it meets the stress and reliability tests required for automotive under-hood and chassis applications.

What is the difference between AUIRLZ44ZL and AUIRLZ44Z?

The difference is typically in the package or lead-free finish designation. Both share the same 55 V, 51 A, 13.5 mΩ die. The 'L' suffix often indicates lead-free / RoHS-compliant plating. Verify the exact suffix against your BOM's environmental compliance requirements.

What is the closest pin-compatible alternative to AUIRLZ44ZL?

Within the same HEXFET family, the AUIRLZ44Z (without the L suffix) is a direct pin-compatible alternative if lead-free finish is not required. For a different brand, compare parts with the same TO-220AB footprint, 55 V minimum rating, and similar Rds(on) — but no single cross is guaranteed without testing.