The DS1857B-050+ from Analog Devices Inc./Maxim Integrated is a digital potentiometer with 50 kΩ resistance, 2 circuits, 256 taps and an I2C interface, in a 16-CSBGA (4x4) package.
The DS1857E-050 from Analog Devices Inc./Maxim Integrated is a digital potentiometer Integrated Circuit with 50 kΩ resistance, 2 circuits, 256 taps and I2C interface in a 16-TSSOP package.