64-tap linear digital pot with pushbutton control
The DS1809U-100+ is a 64-tap linear-taper digital potentiometer from the Analog Devices Dallastat series, offering 100 kΩ end-to-end resistance in a single-circuit configuration. Each of the 64 taps increments the wiper position by an equal 1.56 kΩ step, making it suitable for voltage-divider adjustment, gain trimming, or setting a reference level in a 5 V signal chain. The pushbutton interface allows direct operator control — two buttons (up/down) adjust the wiper without needing a microcontroller or serial bus, which simplifies the BOM in panel-mounted or manually calibrated equipment.
Non-volatile wiper retention and industrial temperature range
The wiper position is stored in non-volatile memory, so the setting persists through power cycles — no boot-time re-initialization routine is required, which matters for equipment that must resume its last calibration state after a power loss. The 750 ppm/°C temperature coefficient means the end-to-end resistance drifts roughly 0.75% per 10°C — this is typical for CMOS digital pots and is acceptable for trimming applications where the divider ratio, not the absolute resistance, is the controlled parameter.
Package, supply, and wiper resistance considerations
Housed in the 8-uMAX/uSOP package (3×3 mm footprint, 0.118-inch body width), the DS1809U-100+ is a compact surface-mount device that fits on space-constrained PCBs alongside other 8-pin logic or analog parts. Operates from a single 5 V supply rail, matching legacy 5 V logic systems — no additional level translator is needed when the pushbutton inputs are driven by a 5 V MCU or mechanical switches with pull-up resistors. The maximum wiper resistance is 400 Ω — this on-resistance of the internal analog switch adds a series offset that must be factored into the divider ratio calculation, especially at low tap positions where the wiper-to-ground resistance is small. End-to-end resistance tolerance is ±20%, so the absolute current drawn through the potentiometer varies by up to 20% from part to part — the divider ratio accuracy is better than this, but the absolute resistance is not tightly controlled.
Active lifecycle and compliance status
ROHS3 compliant, meeting the latest EU restriction-of-hazardous-substances directive — no exemption-based compliance gap to manage in the supply chain.