Triple, 128-Position, Nonvolatile, Variable, Digital Resistor/Switch

Triple, 128-Position, Nonvolatile, Variable, Digital Resistors/Switches Simplify Automated PC Power-Supply Trim

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The DS3904/DS3905 contain three nonvolatile (NV) low temperature coefficient, variable digital resistors. Each resistor has 128 user-selectable positions. Additionally, the DS3904/DS3905 have a high-impedance setting that allows each resistor to function as a digital switch. The DS3904/DS3905 can operate over a 2.7V to 5.5V supply voltage range, and communication with the device is achieved through a 2-wire serial interface. Address pins allow multiple DS3904/DS3905s to operate on the same two-wire bus. The DS3904 has one address pin, allowing two DS3904s to share the bus, while the DS3905 has three address pins, allowing up to eight DS3905s to share a common bus. The low-cost and small size of the DS3904/DS3905 make them ideal replacements for conventional mechanical trimming resistors.
DS3904, DS3905: Typical Operating Circuit DS3904, DS3905: Typical Operating Circuit Enlarge+

Key Features

  • Three 20kΩ, 128-Position Linear Digital Resistors
  • Resistor Settings are Stored in NV Memory
  • Each Resistor has a High-Impedance Setting for Switch Operation to Control Digital Logic
  • Low Temperature Coefficient
  • 2-Wire Serial Interface
  • 2.7V to 5.5V Operating Range
  • -40°C to +85°C Industrial Temperature
  • Packaging: 8-Pin µSOP for DS3904, 10-pin µSOP for DS3905


  • Cell Phones/PDAs
  • Fibre Optic Transceiver Modules
  • Portable Electronics
  • Power-Supply Calibration
  • Test Equipment

See parametric specs for Digital Potentiometers (117)

Part NumberTaperPOTsControl InterfaceWiper MemoryStepsREND-TO-END
Res. Tol.
Temp. Coeff.
(typ)(max)(See Notes)
DS3904 Linear32-Wire AddressableNon-Volatile1282025125200
$0.87 @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: DS3904.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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