Dual-channel 50kΩ digital pot with non-volatile wiper storage
The DS1856B-M50+ is a dual-channel digital potentiometer from Analog Devices, configured as a rheostat with 256 taps per channel across a 50kΩ end-to-end resistance. Each channel provides 256 discrete resistance steps from 0 to 50kΩ, controlled via an I²C interface. The linear taper means resistance changes linearly with wiper position — suited for precision voltage divider, programmable current source, or sensor trim applications where a logarithmic curve is not required. Non-volatile memory stores the wiper position and configuration across power cycles, so the device powers up at the last programmed setting without needing a microcontroller to re-initialize it on each boot.
Package, supply, and temperature range
Housed in a 16-ball CSBGA (4x4 mm) package — the 0.80 mm ball pitch demands a controlled reflow profile and X-ray inspection to verify solder joint integrity. The supplier device package is 16-CSBGA (4x4), a fine-pitch BGA with a 4 mm square footprint. Operating temperature spans -40°C to 95°C, suitable for industrial and telecom environments. The integrated temperature sensor provides on-die temperature monitoring accessible via the I²C bus — useful for thermal compensation of the wiper resistance or system-level temperature logging.
Active production — sourcing and compliance
ROHS3 compliant — fully lead-free with no RoHS exemptions. The part carries a ±20% resistance tolerance and a ±50 ppm/°C temperature coefficient, typical for digital potentiometers in this class.