Texas Instruments’ (TI) SN74HC4851/HC4852, analog multiplexer/demultiplexer (mux/demux) device is pin compatible with the 4051/4052 function. The HC4851/ HC4852 also offers injection current protection, which makes it an ideal solution in harsh environments such as automotive, where voltage spikes in excess of normal logic voltage levels are common. The injection current effect control circuitry eliminates the need for external diode/resistor networks typically used to keep the analog channel signals within the supply voltage range. TI offers the HC4851/HC4852 in a variety of pack- age options: PDIP, SOIC, TSSOP and TVSOP.