32-Tap Audio Logarithmic Taper Digital Potentiometer

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The MAX5407 SOT-PoT™ is a logarithmic taper digital potentiometer with 32 tap points that has 1dB steps between taps. This device is ideal for audio applications, such as volume control and fading/balancing audio signals.

The MAX5407 consists of a resistor string and CMOS switches that are digitally controlled through a simple 2-wire serial interface. This device performs the same function as a mechanical potentiometer. The device has a fixed end-to-end resistance of 20kΩ and features zero-crossing detection to minimize the audible noise generated by the wiper transitions.

This device has nominal resistor temperature coefficients of 35ppm/°C end-to-end and 5ppm/°C ratiometric. The MAX5407 is available in a space saving 8-pin SOT23 package and is guaranteed from -40°C to +85°C.
MAX5407: Functional Diagram MAX5407: Functional Diagram Enlarge+

Key Features

  • Miniature 3mm x 3mm 8-Pin SOT23 Package
  • Logarithmic Taper with 1dB Steps Between Taps
  • 32 Tap Positions
  • Low 0.35µA Supply Current
  • +2.7V to +5.5V Single-Supply Operation
  • Zero-Crossing Detection to Minimize Audible Clicks During Wiper Transitions
  • Simple Up/Down 2-Wire Serial Data Interface
  • Power-On Reset
    • Wiper Goes to Maximum Attenuation (Lowest Tap Position)
  • 20kΩ End-to-End Resistance


  • Audio Volume Control
  • Fading/Balancing Audio Signals
  • Mechanical Potentiometer Replacements

See parametric specs for Digital Potentiometers (118)

Part NumberTaperPOTsControl InterfaceWiper MemoryStepsREND-TO-END
Res. Tol.
Temp. Coeff.
Wiper Resistance
typtypmaxSee Notes
MAX5407 Log1Direction+ClockVolatile322025354000.35
$1.01 @1k

Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.
Product Reliability Reports: MAX5407.pdf 
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C   Material Composition  

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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