The TK15321M is an Analog Switch IC that was developed for audio frequency. Function is to select one output from two inputs in a device that includes two circuits, and the channel can be changed by low level. The TK15321M has a mono-power supply and the input bias is a built-in type (VCC / 2 V). Because the distortion is very low, the TK15321M fits various signals switching. It is best suited for Hi-Fi devices. Operating voltage is wide, the circuit plan is simple. The TK15321M is available in a small plastic surface mount package (SSOP-12).