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 AUIRF7675S2 devices are optimized with low gate charge (Qg) to improve THD and efficiency while low Diode Reverse Recovery Charge (Qrr) further improves Total Harmonic Distortion (THD) and lowers EMI.
With a footprint smaller than an SO-8, the AUIRF7640S2 and AUIRF7647S2 Small Can devices can deliver 100W per channel into an 8 Ohm load without a heat sink, saving PCB space where multiple channels are required. The Medium Can AUIRF7675M2 device, which features a footprint 54 percent smaller than a DPak, is capable of delivering 250W per channel into a 4 Ohm load, again without a heat sink, making it well suited for the sub-woofer output stage of class D audio systems.