The HT34118ARWZ with SOP-28 is an audio interface IC (integrated circuit) manufactured by HTCSEMI. It is RoHS (Restriction of Hazardous Substances) compliant, meaning it is designed to meet European directives on hazardous substances. It is primarily designed to provide audio amplification and mixing in various applications and has built-in input and output buffering. It features two adjustable gains, with selectable input levels and outputs for both balanced and unbalanced applications. It can work with a wide range of different audio sources such as MP3 players, portable audio players, CD players, tablet PCs, and laptops. This IC can also be used in low frequency sound systems or for home theater solutions. It also supports an 8-bit digital to analog informer (DAC) and digital signal processing (DSP) capabilities for superior audio performance.