DS3905U-020+T&R

Digital Potentiometers Overview

The DS3905U-020+T&R is a triple nonvolatile digital variable resistor IC manufactured by Analog Devices Inc./Maxim Integrated. It features three 20kΩ resistors, each with 128 user-selectable linear positions and a high-impedance setting for switch operation. The device operates on a 2.7V to 5.5V supply voltage and communicates via a 2-wire serial interface. It includes three address pins (A0, A1, A2) allowing up to eight devices on a single bus. Resistor settings are stored in nonvolatile memory, ensuring retention during power loss. The component is housed in a 10-pin µSOP package and supports an industrial temperature range of -40°C to +85°C.

Digital Potentiometers Feature Summary

• Triple 20kΩ, 128-position linear digital resistors with nonvolatile memory storage
• High-impedance mode allows resistor function as a digital switch
• Three address pins enable up to eight devices on a shared 2-wire bus
• Operates within a 2.7V to 5.5V supply voltage range

Digital Potentiometers Applications

• Power-supply calibration
• Fibre optic transceiver modules
• Portable electronics
• Test equipment

Digital Potentiometers Procurement Notes

Verify the ordering suffix '+T&R' indicates tape-and-reel packaging when sourcing this specific variant. Confirm the manufacturer designation remains Analog Devices Inc./Maxim Integrated. Ensure the part number matches the DS3905U-020+ specification for triple 20kΩ resistors. Check for RoHS compliance documentation if required for your assembly process.

Digital Potentiometers Selection Notes

Select the DS3905U-020+ over the DS3904 variant when multiple devices must share a single 2-wire serial bus, as it provides three address pins compared to the DS3904's single pin. Choose this model specifically for applications requiring three identical 20kΩ resistors; the DS3904U-010 offers mixed resistance values. Verify that the 10-pin µSOP package fits the PCB layout constraints.

Digital Potentiometers Part Context

This component belongs to the DS3904/DS3905 family of triple nonvolatile digital variable resistors. The DS3905 variant is distinguished by its 10-pin µSOP package and three hardware address pins, facilitating multi-device bus configurations. It serves as a solid-state replacement for mechanical trimming potentiometers and dip switches in precision analog circuits.

Digital Potentiometers Replacement Considerations

Public confirmed substitute part numbers: None listed.