Three 20kΩ rheostats, 128 taps each, I²C-controlled
The DS3904U-020+ is a triple 20kΩ digital potentiometer in a rheostat configuration, offering 128 tap positions per channel. It communicates over an I²C interface and stores the wiper position in non-volatile memory, so the setting persists after power cycling. Each of the three independent rheostats has a linear taper, meaning the resistance between the wiper and one end changes linearly with the digital code. This suits applications like adjustable gain stages, offset trimming, or programmable voltage dividers where a straight-line response is needed.
Supply range, temperature grade, and package
Housed in an 8-pin uMAX/uSOP (3.00 mm × 3.00 mm body, 0.65 mm pitch), the surface-mount package is compact enough for space-constrained designs. The selectable address feature lets up to four devices share the same I²C bus without address conflicts, useful when multiple channels are needed.