I²C digital pot with 129 tap positions
The MCP4531-103E/MS is a single-channel, 10 kΩ digital potentiometer from Microchip's MCP45xx family, offering 129 tap positions via an I²C interface. The linear taper suits level-setting and trim applications where the wiper resistance is a consistent 75 Ω typical across the range.
The 150 ppm/°C tempo means the 10 kΩ end-to-end resistance drifts about 150 Ω over a 100°C swing — something to budget if the pot sets a precision bias.
The selectable address feature lets you hang up to four of these on the same I²C bus by tying the address pins high or low — handy for multi-channel trim boards without extra GPIOs.