What this chip is — capacitance-to-digital converter for proximity and level sensing
The AD7151BRMZ-REEL is a single-channel capacitance-to-digital converter from Analog Devices. It takes a capacitive input (via a voltage input structure) and outputs a digital representation of the measured capacitance. The part draws only 70 µA supply current, making it a fit for battery-powered or loop-powered sensor nodes that need to detect proximity, touch, or fluid level without mechanical contacts. It operates over the -40°C to 85°C industrial temperature range and comes in a 10-MSOP surface-mount package. The ROHS3 compliance simplifies export and environmental reporting.
70 µA supply — what it means for the power budget
The 70 µA supply current is the headline rating that separates this part from general-purpose ADCs.
Package and mounting — 10-MSOP, surface-mount only
The part is supplied in a 10-MSOP package (3.00 mm body width, 0.118" pitch). It is surface-mount only — no through-hole option. The Tape & Reel (TR) or Cut Tape (CT) packaging suits both high-volume pick-and-place and small-batch prototype assembly. The 10-MSOP footprint is compact enough for space-constrained sensor modules but requires a microscope or good lighting for hand-soldering; a hot-air station is safer than a soldering iron for rework.
Sourcing and lifecycle — active, no LTB, ROHS3
It is ROHS3 compliant, which covers the current EU RoHS exemption list. For BOM planning, this part is a safe choice for new designs — no PCN risk from a phase-out.