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AUIRLR3705ZTRL

AUIRLR3705ZTRL N-Channel MOSFET, 55V 42A DPAK

MPNAUIRLR3705ZTRL
Active

Infineon HEXFET® N-Channel MOSFET, AUIRLR3705ZTRL, 55 V drain-source, 42 A continuous drain current, 8 mOhm Rds(on) max at 10 V, DPAK (TO-252) surface-mount package, -55 to 175 °C junction temperature.

$1.08Ref. price · indicative, final on quote
Infineon Technologies AUIRLR3705ZTRL datasheet (PDF)
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

AUIRLR3705ZTRL specifications
ParameterValue
SeriesHEXFET®
FET typeN-Channel
MountingSurface Mount
Operating temperature high-55°C to 175°C(TJ)
Power130.0
Package_typeBulk
Capacitance_uf0.0029
StatusActive
Supply voltage55.0
Vgs(Th) (Max) @ id3 V @ 250µA
Switching current42.0
Rds on (Max) @ id, vgs8mOhm @ 42 A, 10 V
Gate charge (Qg) (Max) @ vgs66 nC @ 5 V

Product details

The 8 mOhm Rds(on) at 10 V gate drive is the number that sets the conduction loss — at 42 A that's about 14 W of dissipation before you even switch, so the thermal pad on the DPAK needs a decent copper pour to keep the junction under 175 °C.

66 nC gate charge — easy to drive, moderate speed

Gate charge is 66 nC at 5 V. The 3 V threshold at 250 µA means it will turn on cleanly with 5 V logic, but you want a solid 10 V gate drive to hit that 8 mOhm Rds(on) figure.

Junction temperature range -55 to 175 °C

The junction is rated from -55 to 175 °C. That is the full automotive temperature grade — it survives under-hood heat soak and cold cranking. For a 130 W power dissipation ceiling, the limiting factor is the board's ability to pull heat out of the DPAK tab, not the silicon itself.

Active production — no LTB worry

It is a current-production part that can be quoted for both prototype and production volumes through the independent channel.

Frequently asked questions

Is AUIRLR3705ZTRL a direct replacement for IRLR3705ZTRL?

The AUIRLR3705ZTRL is the automotive-qualified version of the IRLR3705ZTRL. Both are 55 V, 42 A N-channel MOSFETs in DPAK with the same pinout and similar Rds(on). The AUIRLR3705ZTRL is rated for the -55 to 175 °C junction temperature range, making it a drop-in for designs that need the wider temperature grade. Confirm the gate drive voltage in your BOM — both use the same 3 V threshold.