Shipping overseas is convenient with the electronic component packed in 16-SOIC (0.154, 3.90mm Width). This packaging method provides high reliability because it uses advanced packaging techniques. Multiplexers like this are mounted in the Surface Mount position. 4:1 is the ratio of multiplexer to demultiplexer circuits. An extended operating temperature of -40°C~85°C TA degrees Celsius. The total number of terminations is 16. A 4 channel electronic part produces high-quality output. With a 2.5V voltage supply, the electrical component should be turned on and run. As part of the design of the 16 series, this electronic part has been incorporated into the system. Multiplexers built on a SP4T switching circuit are built. A total of 2 circuits make up this switch device. Try searching for MAX4639 variants of the analog switch ic. The datasheets for the 16 pins explain the functions. It is a typical Multiplexer or Switches analog multiplexer. There is an analog IC DIFFERENTIAL MULTIPLEXER integrated with this board.