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Infineon Technologies AUIRFR4105 — Discrete Semiconductors

Infineon AUIRFR4105 N-Channel HEXFET, 55V 20A, 45mOhm

MPNAUIRFR4105
Active

Infineon HEXFET® series, N-Channel MOSFET, AUIRFR4105, 55 V drain-source, 20 A switching current, 45 mOhm Rds(on) at 16 A, 10 V, 34 nC gate charge, -55°C to 175°C junction temperature, surface mount.

$0.61Ref. price · indicative, final on quote
Infineon Technologies AUIRFR4105 datasheet (PDF)
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

AUIRFR4105 specifications
ParameterValue
SeriesHEXFET®
FET typeN-Channel
MountingSurface Mount
Operating temperature high-55°C to 175°C(TJ)
Vgs±20 V
Power68.0
Package_typeBulk
Capacitance_uf0.0007
StatusActive
Supply voltage55.0
Vgs(Th) (Max) @ id4 V @ 250µA
Switching current20.0
Rds on (Max) @ id, vgs45mOhm @ 16 A, 10 V
Gate charge (Qg) (Max) @ vgs34 nC @ 10 V

Product details

The Infineon AUIRFR4105 is an automotive-grade N-channel HEXFET MOSFET rated for 55 V drain-source breakdown and 20 A continuous switching current.

Junction temperature range — under-hood and high-side capability

Power dissipation is 68 W.

Gate drive voltage — ±20 V Vgs rating

Maximum gate-source voltage is ±20 V. Threshold voltage is 4 V at 250 µA.

Package and mounting — surface-mount D-Pak

Surface-mount package (D-Pak / TO-252) suited for automated assembly on an automotive PCB. The tab is the drain terminal; ensure the copper footprint and thermal vias are sized for the 68 W dissipation if the part runs near its current limit.

Frequently asked questions

What are the AUIRFR4105 thermal and switching characteristics?

Key switching characteristics include a 34 nC total gate charge at 10 V drive and a 45 mOhm maximum on-resistance at 16 A, 10 V. The junction temperature range is -55°C to 175°C, and the part is rated for 68 W power dissipation. These figures define the conduction and switching loss budget for a 20 A automotive load.

Is AUIRFR4105 RoHS compliant?

The AUIRFR4105 is listed as RoHS compliant. No REACH restriction flags are associated with this order code in the current production release.