The SM6451A/B is a 3-wire serial-controlled electronic variable volume IC for audio applications. It provides electronic volume control for a stereo system (left and right channels), and independent channel attenuation and muting, with greatly enhanced digital zip noise suppression. The chip address function allows up to four SM6451A/B devices to be connected and individually controlled over the 3-wire control interface from a single CPU.

Block Diagram

Key Features

  • Stereo inputs and outputs
  • Attenuation/volume control
  • 2-channel independent control
  • 1 dB/step over 80 steps
  • Mute function
  • 3-wire serial data control (MDT, MCK, MLEN)
  • Chip addressing (up to 4 devices can be connected in parallel)
  • Supply voltage range
  • SM6451A: 4.5V to 5.5V
  • SM6451B: 2.5V to 3.6V
  • Package: TSSOP-16-050044-2


  • Digital Audio
  • HQ low attenuation audio
  • High end headsets


  • Better sound playback at low audio levels
  • No degradation of digital audio resolution at low volume levels
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  1. SM6451BT-G
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