< snip > > If someone knows of a low drop (Rds) MOSFET h-bridge, please let me know. How about Thomson's L6203: Supply voltage 48 V max Current 3 A max Rds(on) 0.3 ohm typ. (0.55 max) Inputs TTL compatible Operating frequency up to 100 kHz Specified reverse source-drain diode Short circuit protected Thermal shutdown Multiwatt 11 package Except I don't know if you consider it still cheap. Here in Czech in costs about $4 in single quantities. Primary area of application is in driving bipolar stepper motors, but will certainly suit for DC motors as well. For lower currents see L6202 and L6201. Regards Josef Hanzal