Triple NV Low Step Size Variable Resistor Plus Memory

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The DS3906 is intended for low resistance, small step-size applications. It contains three nonvolatile (NV), low-temperature coefficient, variable digital resistors that are capable of ohm and subohm increments when used in parallel with a fixed external resistor. All three of the DS3906's resistors have 64 positions (plus a high-Z state) with a pseudo-log response cleverly chosen to have a linear equivalent resistance when paired with an external resistor (see graphs below). The DS3906 also contains 16 bytes of user EEPROM that, in addition to the resistors, are controlled through an I²C-compatible serial interface. Three address pins allow up to eight DS3906s to be placed on the same I²C bus.

The DS3906 can also be factory cutomized to provide a variety of transfer functions depending on user requirements. Contact for additional information.
DS3906: Typical Application Circuit DS3906: Typical Application Circuit Enlarge+

Key Features

  • Three Programmable Resistors for Low Step-Size Applications (Ohm and Subohm)
  • Resistor Settings are NV
  • 16-Byte NV User Memory (EEPROM)
  • I²C-Compatible Serial Interface
  • Up to 8 Devices Can be Multidropped on the Same I²C Bus
  • Low Power Consumption
  • Wide Operating Voltage (2.7V to 5.5V)
  • Operating Temperature Range: -40°C to +85°C


  • Low Ohm, Fine Resolution Driver Control for LED Display Panels
  • Low Ohm, Fine Resolution Instrumentation Control

See parametric specs for Digital Potentiometers (117)

Part NumberTaperPOTsControl InterfaceWiper MemoryStepsRes. Tol.
Temp. Coeff.
(typ)(max)(See Notes)
DS3906 Pseudo-Log32-WireNon-Volatile642060160
$1.18 @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: DS3906.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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