ITEM NAME:1PCS 74HC4051 8-channel analog multiplexer/demultiplexer J Pb.The 74HC4051; 74HCT4051 is a single-pole octal-throw analog switch (SP8T) suitable for. use in analog or digital 8:1 multiplexer/demultiplexer applications. The switch features. ï ® Logic level translation: to enable 5 V logic to communicate with ï‚ ±5 V analog signals.