What this digital pot does and where it fits
The MAX5421CEUB+ from Analog Devices is a single-channel digital potentiometer with a linear taper, 4 programmable tap positions, and a total end-to-end resistance of 15kΩ. It is configured as a potentiometer (voltage divider) and uses a parallel interface for wiper control. The volatile memory means the wiper position resets to mid-scale on power-up. Typical applications include gain and offset adjustment in industrial sensors, programmable voltage references, and calibration trims in test equipment where a small number of discrete steps is acceptable.
4 taps — what that means for your circuit
With 4 taps, this part gives four discrete wiper positions. That is coarse adjustment — fine for selecting a fixed gain range or a calibration trim step.
Supply flexibility: single 5V or dual ±5V
The MAX5421CEUB+ runs from a single 5V supply or dual ±5V rails. The dual-supply option lets the wiper swing through bipolar signals, which is useful for op-amp offset nulling or programmable gain amplifiers that need to center around ground. If you only have a single 5V rail, the part works fine — just tie VSS to ground. The 5V logic interface is compatible with standard 5V CMOS and TTL levels.
Package and footprint
Housed in a 10-pin uMAX/uSOP package (3.00 mm body width), this is a surface-mount part that fits tight PCB layouts. The supplier device package is 10-uMAX/uSOP.
Temperature grade and environment
Rated for -40°C to 85°C, this part covers industrial control cabinets, outdoor telecom enclosures, and automotive cabin environments.
Lifecycle and sourcing
It is ROHS3 compliant. No direct pin-compatible second source is listed in the available documentation.