DS3904U-020/TR

Digital Potentiometers Overview

The DS3904U-020/TR is a triple, non-volatile digital potentiometer IC manufactured by Analog Devices Inc. (Maxim Integrated). It features three independent linear resistors with 128 user-selectable tap positions each, providing an end-to-end resistance of 20 kOhms per channel. The device utilizes a 2-wire serial interface for communication and includes address pins to support multiple units on the same bus. Designed as a replacement for mechanical trimmers, it operates within a supply voltage range of 2.7 V to 5.5 V and maintains resistor settings in non-volatile memory across power cycles.

Digital Potentiometers Feature Summary

• Triple non-volatile digital potentiometers with 128 taps each
• 20 kOhm end-to-end resistance with ±25% tolerance
• 2-wire serial interface with multi-device addressing capability
• Low temperature coefficient of approximately 125 ppm/°C

Digital Potentiometers Applications

• Replacement for conventional mechanical trimming resistors
• Portable equipment requiring low-power variable resistance
• Battery-powered systems needing persistent calibration data

Digital Potentiometers Procurement Notes

Verify the specific suffix designation against official documentation, as standard listings often use +T&R or similar variants. Confirm RoHS compliance status through current manufacturer datasheets. Check for obsolescence notices or limited availability statuses directly from Analog Devices distributors before finalizing procurement plans.

Digital Potentiometers Selection Notes

Select this component when three independent, non-volatile resistance adjustments are required in a compact package. Ensure the 20 kOhm resistance value and 128-step resolution meet circuit requirements. Verify that the 2-wire serial interface aligns with the host microcontroller's available communication ports and that the operating voltage range matches the system power supply.

Digital Potentiometers Part Context

This part belongs to the DS3904U family of triple non-volatile digital potentiometers. Variants within the series differ primarily in total resistance values, such as 10 kOhm or other configurations, while maintaining identical pinouts and functional characteristics. The UMAX-8 package provides a small form factor suitable for space-constrained PCB designs.

Digital Potentiometers Replacement Considerations

Direct replacements include other DS3904U variants with different resistance values if electrical parameters allow. Cross-reference with DS3906U series for similar functionality but different step counts and resistance profiles. Always verify pin compatibility and interface protocols before substituting.