The HEF4071BP is a quad 2-input OR Gate with fully buffered for highest noise immunity and pattern insensitivity to output impedance variations. It operates over a recommended VDD power supply range of 3 to 15V referenced to VSS (usually ground). Unused inputs must be connected to VDD, VSS or another input. Fully static operation Standardized symmetrical output characteristics Inputs and outputs are protected against electrostatic effects Complies with JEDEC standard JESD 13-B ESD sensitive device, care should be taken during transport and handling.