L293 and L293D are popular motor driver ICs having a wide supply voltage range of 4.5V - 36V and is capable of handling an output current of 1A per channel. Pinout diagram of L293 and L293D is given below.
Main difference between L293 and L293D is , D in L293D indicates an internally fitted diode ( Output Clamp Diodes ) meaning that we don't need to add any external components. But if you are using L293 external diode has to be added. This diode is used for Inductive Transient Suppression.
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