STB120NH03L is a N-Channel 30V - 0.005Ω - 9A - TO-220/D2PAK STripFET™ III Power MOSFET for DC-DC Conversion from ST, with typical RDS(on) = 0.005Ω @ 10V, RDS(on) * Qg Industry’s Benchmark Low, Conduction Losses Reduced, Switching Losses Reduced, Low Threshold. It is ideal in high performance DC-DC converter applications