Infineon AUIRFN8403TR: A Benchmark in Power MOSFET Performance

The relentless pursuit of efficiency and power density in modern electronics demands components that deliver exceptional performance in increasingly compact form factors. The Infineon AUIRFN8403TR stands as a prime example, offering designers a robust and highly efficient solution for a wide array of power management challenges. This 40V Single N-Channel HEXFET Power MOSFET, housed in the surface-mount D2PAK (TO-263) package, is engineered to meet the rigorous demands of automotive, industrial, and consumer applications.

At the heart of this device's performance is its exceptionally low on-state resistance (R DS(on)) of just 1.3 mΩ (max). This critical parameter is a primary determinant of efficiency in switching applications. A lower R DS(on) translates directly to reduced conduction losses, meaning less power is wasted as heat during operation. This allows systems to run cooler, improves overall energy efficiency, and can often lead to simplifications in thermal management design, saving both space and cost.

The D2PAK surface-mount package provides a perfect balance between power handling capability and board space savings. Compared to through-hole alternatives like the TO-220, the D2PAK offers a much lower profile for slimmer end products while its large leadframe and exposed pad facilitate excellent thermal performance. This design enables highly effective heat transfer from the silicon die to the printed circuit board (PCB), allowing the MOSFET to sustain high current levels—up to 240A pulse—with reliability.

Furthermore, the AUIRFN8403TR is characterized by its fast switching speed and high robustness. The advanced silicon technology minimizes gate charge (Q G ) and switching losses, which is crucial for high-frequency switching regulators and motor control circuits. This ensures smooth operation and contributes to higher system-level efficiency. Its qualification for automotive applications underscores its reliability, having been designed to withstand the harsh electrical and environmental conditions found in vehicles.

Typical applications where this MOSFET excels include:

DC-DC Converters in server and telecom power supplies.

Motor Drive Control for industrial automation and automotive systems (e.g., electric power steering, braking).

Load Switching and power distribution in advanced driver-assistance systems (ADAS).

Synchronous Rectification in switch-mode power supplies (SMPS).

ICGOODFIND: The Infineon AUIRFN8403TR is a superior choice for engineers seeking to optimize power conversion stages. Its industry-leading low R DS(on) in the space-efficient D2PAK package delivers an unbeatable combination of high efficiency, power density, and thermal performance, making it an indispensable component for next-generation high-current applications.

Keywords: Low RDS(on), D2PAK Package, Power MOSFET, High Efficiency, Automotive Grade.