MM74HC138MX brand manufacturers: Aptina, Twicea stock, MM74HC138MX reference price.Aptina. MM74HC138MX parameters, MM74HC138MX Datasheet PDF and pin diagram description download.You can use the MM74HC138MX Logic - Signal Switches, Multiplexers, Decoders, DSP Datesheet PDF, find MM74HC138MX pin diagram and circuit diagram and usage method of function,MM74HC138MX electronics tutorials.You can download from the Twicea.