The MAX5438EUB+ is a single-channel, 128-tap digital potentiometer with a linear taper and 100kΩ end-to-end resistance. It is controlled via an SPI interface.
The 100kΩ resistance is a common value for audio level control, offset adjustment, and programmable reference dividers. The linear taper means wiper resistance changes linearly with the digital code.
The 10-uMAX/uSOP package (3mm x 3mm body, 0.118" width) is a standard footprint shared with other Maxim digital pots, so second-source options exist within the family if needed.