The 74HC32D is a quad 2-input OR Gate. Inputs include clamp diodes. This enables the use of current limiting resistors to interface inputs to voltages in excess of VCC. Symmetrical output impedance, high noise immunity and low power dissipation.
The SN74HC32DR is a quadruple 2-input Positive-OR Gate. This device perform the Boolean function Y = (A\ • B\\)\ or Y =A + B in positive logic. The device operates at voltage range of 2 to 6V and outputs can drive up to 10 LSTTL loads.