Infineon Technologies AUIRF4905S

Overview

AUIRF4905S from Infineon is a P-channel automotive-grade HEXFET® Power MOSFET in D2PAK (TO-263) package, rated for -55 V V_DSS, 20 mΩ R_DS(on) at -10 V V_GS, and -42 A continuous drain current (package-limited). It supports repetitive avalanche operation up to T_Jmax = +150°C and delivers fast switching with 20 ns turn-on delay and 64 ns fall time - deployed in high-reliability 12 V automotive power distribution systems including motor control and load switching.

For engineers reviewing the AUIRF4905S datasheet, AUIRF4905S pinout, AUIRF4905S application, or AUIRF4905S equivalent, this page provides verified thermal resistance (R_θJC = 0.75 °C/W), gate charge (Q_g = 120–180 nC), body diode recovery (t_rr = 61–92 ns), and avalanche energy (E_AS = 790 mJ tested) - all critical for robust high-side switch design in engine control units and battery disconnect circuits.

Technical Context

This P-channel MOSFET operates as a high-side switch in automotive DC systems where ground-referenced control is impractical. Its -55 V breakdown voltage and -42 A package-limited current support 12 V/24 V battery rail protection, while the low 20 mΩ on-resistance minimizes conduction loss at full load. The device integrates a co-packaged body diode with -1.3 V forward voltage and 150–220 nC reverse recovery charge, enabling synchronous rectification in bidirectional power paths.

Thermal performance is defined by R_θJC = 0.75 °C/W and R_θJA = 40 °C/W (1"² FR-4 PCB), allowing 170 W power dissipation at T_C = 25°C with linear derating of 1.3 W/°C. Repetitive avalanche capability is validated per Fig. 15–16 under unclamped inductive switching with L = 0.08 mH, I_AS = 66 A, and V_GS = 10 V.

Key Specifications

Pinout & Package

Package: D2PAK (TO-263), surface-mount, isolated tab (drain-connected), 3-terminal configuration.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar P-channel automotive power switch applications.

Compared with STP55P06 and IRF4905SPBF, the AUIRF4905S uniquely combines AEC-Q101 qualification, D2PAK thermal performance (R_θJC = 0.75 °C/W), and validated 790 mJ avalanche energy - making it the only option qualified for production deployment in engine bay power switches.

Availability

AUIRF4905S is available at Aetrix Electronics and suitable for automotive engine control units, battery disconnect modules, and commercial vehicle lighting systems requiring stable component supply across extended product lifecycles.

Supply support for AUIRF4905S includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Infineon Technologies is a German semiconductor manufacturer specializing in power management, automotive electronics, and security solutions, with global manufacturing and qualification infrastructure.

The AUIRF4905S belongs to Infineon's automotive-qualified HEXFET® Power MOSFET product line, engineered specifically for high-reliability 12 V/24 V power switching in harsh under-hood environments.

FAQ

What is the maximum allowable gate-to-source voltage for AUIRF4905S?

The absolute maximum V_GS is ±20 V. Operation beyond this range risks permanent gate oxide damage. For reliable enhancement, apply -10 V to achieve full R_DS(on) specification; gate drive circuits must include clamping (e.g., Zener diodes) to prevent transients from exceeding ±20 V during switching transitions or ESD events.

Can AUIRF4905S be used in parallel configurations?

Yes, but with strict layout and biasing controls: matched gate resistors (≤1 Ω tolerance), symmetrical PCB trace lengths, and individual source inductance minimization (<5 nH) are required to ensure current sharing. Thermal coupling via shared heatsink is essential - mismatched junction temperatures cause current hogging due to negative R_DS(on) temperature coefficient.

Is the body diode suitable for continuous freewheeling in H-bridge motor drives?

The integrated body diode supports continuous freewheeling at -42 A and T_J ≤ 150°C, but its V_SD = -1.3 V and Q_rr = 150–220 nC generate higher conduction and recovery losses than discrete Schottky diodes. For >10 kHz PWM, external synchronous rectification is recommended to maintain efficiency and thermal margin.

Does AUIRF4905S require a gate resistor for safe operation?

Yes - a series gate resistor (typically 10–47 Ω) is mandatory to dampen ringing caused by gate-drain capacitance (C_rss = 450 pF) and parasitic inductance. Without it, overshoot can exceed ±20 V, risking gate oxide failure. Resistor value balances switching speed (lower R = faster) against EMI and shoot-through risk in half-bridge configurations.