International Rectifier has introduced a family of automotive DirectFET2 power mosfets for high frequency switching applications including the output stage for Class D audio systems.

The AUIRF7640S2, AUIRF7647S2 and AUIRF7675M2 devices are optimised with low gate charge (Qg) to improve Total Harmonic Distortion (THD) and efficiency, while low Diode Reverse Recovery Charge (Qrr) further improves THD and lowers EMI. 

With a footprint smaller than an SO-8, the AUIRF7640S2 and AUIRF7647S2 devices are capable of delivering 100W per channel into an 8ohm load with no heat sink where multiple channels are required.

The Medium Can AUIRF7675M2 device, which features a footprint 54% smaller than a DPak is capable of delivering 250W per channel into a 4ohm load with no heat sink making it well suited for the sub-woofer output stage of class D audio systems. 

The devices are qualified according to AEC-Q101 standards.