Temperature-Controlled, NV, I²C, Logarithmic Resistor

Industry's Only Temperature-Compensated Resistor Optimized for APD Bias in Fiber Optic Modules

Please check latest availability status for a specific part variant.


The DS1841 is a 7-bit, logarithmic, nonvolatile (NV) digital resistor that features an on-chip temperature sensor and associated analog-to-digital converter (ADC). The integrated temperature sensor indexes a 72-byte NV lookup table (LUT) encompassing a temperature range from -40°C to +100°C. The LUT output can drive the resistor directly or be added to an NV initial-value register (IVR) to drive the resistor. This flexible LUT-based architecture allows the DS1841 to provide a temperature-compensated resistor output with arbitrary slope. Programming is accomplished by an I²C-compatible interface, which can operate at speeds of up to 400kHz.
DS1841: Typical Operating Circuit DS1841: Typical Operating Circuit Enlarge+

Key Features

  • 22kΩ to 3.7kΩ Adjustable Logarithmic Resistor with a 3.6kΩ Fixed Resistor
  • 128 Wiper Tap Points
  • On-Chip Temperature Sensor and ADC
  • 72-Byte Lookup Table (LUT)
  • I²C-Compatible Serial Interface
  • Address Pins Allow Up to Four DS1841s to Share the Same I²C Bus
  • Digital Supply of 2.7V to 5.5V
  • -40°C to +100°C Operating Range
  • 3mm x 3mm, 10-Pin TDFN Package


  • Instrumentation and Industrial Controls
  • Linear and Nonlinear Compensation
  • Mechanical Potentiometer Replacement
  • Optical Transceivers

See parametric specs for Digital Potentiometers (117)

Part NumberTaperPOTsControl InterfaceWiper MemoryStepsREND-TO-END
Res. Tol.
Temp. Coeff.
Wiper Resistance
(typ)(typ)(max)(See Notes)
DS1841 Log1I2CNon-Volatile12822202503701
$1.03 @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: DS1841.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.

Quality Management System >
Environmental Management System >


Related Resources