The NS4890B is an Audio Power OpAmp in an 8-pin Mini-Small Outline Package (MSOP8) manufactured by Nsiway. It is compliant with the RoHS Directive and is designed for audio applications that require high power output, such as headphone amplifiers and active speakers. It has a wide supply voltage range of up to +/-20V along with an adjustable power output of up to +/-100V. The NS4890B also features high slew rate, low distortion, and noise, and low idle current. Its band-width significantly exceeds 1MHz, which makes it ideal for audio power amplification.