I am building an H-bridge motor control for DC motor . I am using "SQD40N06-14L_GE3 " N_channel MOSFET. Did i have to add a rectifier in parallel with the mosfet (the mosfet already have one integrated).Thanks
The internal parasitic body diode of the MOSFET can be used, but will not be optimal since it's a byproduct of MOSFET construction (too slow, not soft recovery, inefficient). The body diode will be insufficient for some projects. A very few MOSFETs try to optimize the body diode a little bit to reduce overall component costs in a project, but >99% do not.
I always use external diodes.