Infineon AUIRF4905STRL P-Channel Power MOSFET: Datasheet, Application Circuit, and Replacement Part Guide

The Infineon AUIRF4905STRL is a robust P-Channel Power MOSFET engineered for high-performance switching applications. Leveraging Infineon's advanced process technology, this component is designed to deliver exceptional efficiency and reliability in demanding environments such as automotive systems, power management, and motor control circuits. Its P-Channel configuration offers unique advantages in circuit design, particularly for high-side switching applications where it can simplify drive requirements compared to N-Channel alternatives.

Key Datasheet Parameters

A deep dive into the datasheet reveals the core strengths of this MOSFET. It boasts a low on-state resistance (RDS(on)) of 10 mΩ at a gate-source voltage of -10 V, which is a critical factor in minimizing conduction losses and improving overall system efficiency. The device is rated for a drain-source voltage (VDS) of -55 V and a continuous drain current (ID) of -49 A, making it suitable for a wide range of medium to high-power applications. Furthermore, it features an avalanche ruggedness specification, ensuring it can handle unexpected voltage spikes and inductive load switching without failure. Housed in a TO-263 (D2PAK) package, it provides an excellent balance of power handling and footprint size.

Typical Application Circuit

A common use case for the AUIRF4905STRL is in a high-side load switch, such as for controlling a DC motor or a power rail. In this configuration, the source is connected to the positive supply voltage (e.g., 12V), the drain is connected to the load, and the load is grounded. To turn the P-Channel MOSFET on, the gate must be pulled to a voltage sufficiently lower than the source. This is often achieved using a simple N-Channel MOSFET or a bipolar transistor as a low-side driver. A gate resistor (e.g., 10-100Ω) is essential to dampen oscillations and control the switching speed, while a pull-up resistor can ensure the MOSFET remains off when the driver is in a high-impedance state. For robust operation, a Zener diode between the gate and source is frequently added to protect the gate oxide from overvoltage transients.

Replacement Part Guide

While the AUIRF4905STRL is a highly capable component, design engineers often need alternatives due to availability, cost, or slight performance tweaks. Suitable replacement parts must match key parameters: P-Channel type, VDS, continuous current, and package. Potential replacements include:

Infineon AUIRF4905: The direct equivalent without the "STRL" suffix, which often denotes tape and reel packaging.

Vishay Siliconix SUP90210EY: A comparable part with similar VDS and current ratings.

STMicroelectronics STB55P10F7: Offers a different trade-off in RDS(on) and gate charge.

When selecting a replacement, it is crucial to compare the total gate charge (Qg) and switching characteristics to ensure compatibility with the existing driver circuit and desired switching frequency.

ICGOODFIND Summary

The Infineon AUIRF4905STRL stands out as a highly efficient and robust P-Channel MOSFET ideal for automotive and industrial power switching. Its excellent RDS(on) and avalanche capabilities make it a top choice for designers seeking reliability. When considering a replacement, careful cross-referencing of electrical characteristics is paramount to maintain system integrity.

Keywords:

P-Channel MOSFET, High-Side Switch, RDS(on), Power Management, Automotive Grade