256-Tap SOT-PoT, Low-Drift Digital Potentiometers in SOT23

256-Tap Digital Potentiometers Offer the Ultimate Space Savings in an 8-Pin SOT23

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The MAX5400/MAX5401 digital potentiometers offer 256-tap SOT-PoT™ digitally controlled variable resistors in tiny 8-pin SOT23 packages. Each device functions as a mechanical potentiometer, consisting of a fixed resistor string with a digitally controlled wiper contact. They operate from +2.7V to +5.5V single-supply voltages and use an ultra-low supply current of 0.1µA. These devices also provide glitchless switching between resistor taps, as well as a convenient power-on reset that sets the wiper to the midscale position at power-up. A low 5ppm/°C ratiometric temperature coefficient makes it ideal for applications requiring low drift.

The MAX5400/MAX5401 serve well in applications requiring digitally controlled resistors, including adjustable voltage references and programmable gain amplifiers (PGAs). A nominal end-to-end resistor temperature coefficient of 50ppm/°C allows these parts to be used as variable resistors in applications such as low-tempco adjustable gain and other circuit configurations.

Two resistance values are available: 50kΩ (MAX5400) and 100kΩ (MAX5401). Each device is guaranteed over the extended industrial temperature range (-40°C to +85°C).
MAX5400, MAX5401: Functional Diagram MAX5400, MAX5401: Functional Diagram Enlarge+

Key Features

  • Miniature 8-Pin SOT23 (3mm x 3mm)
  • 256 Tap Positions
  • Ultra-Low 0.1µA Supply Current
  • Single-Supply Operation: +2.7V to +5.5V
  • Low Ratiometric Temperature Coefficient: 5ppm/°C
  • Power-On Reset: Wiper Goes to Midscale (Position 128)
  • Glitchless Switching Between the Resistor Taps
  • 3-Wire SPI™-Interface Compatible
  • 50kΩ/100kΩ Resistor Values


  • Adjustable Voltage Reference
  • Low-Drift Programmable-Gain Amplifiers
  • Mechanical Potentiometer Replacements
Part NumberTaperPOTsControl InterfaceWiper MemoryStepsREND-TO-END
Res. Tol.
Temp. Coeff.
Wiper Resistance
typtypmaxSee Notes
MAX5400 Linear13-Wire SerialVolatile2565025502505
$1.15 @1k
MAX5401 100
$1.13 @1k
See All Digital Potentiometers (120)
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.

Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C  

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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