What the STC3115IQT is and where it fits
The STMicroelectronics STC3115IQT is a dedicated battery monitor IC from the OptimGauge™ series, designed to track charge state and voltage in single-cell Li-ion or Li-Polymer packs. It communicates over an I²C bus, making it a natural fit for portable medical devices, handheld instruments, IoT endpoints, and battery-backed industrial sensors where the host MCU already has a spare I²C port. The part is housed in a 10-DFN (3x2 mm) package — small enough to sit directly on the battery-side flex or mainboard without consuming much real estate. Operating temperature spans -40°C to 85°C, which covers the industrial range but stops short of automotive under-hood requirements. That means it is suited for outdoor telecom enclosures, warehouse scanners, and cold-chain data loggers — not for engine-bay or cabin-ambient automotive modules unless the ambient stays below 85°C.
Lifecycle and sourcing reality
The STC3115IQT carries an Active product status. ROHS3 compliance is confirmed, so no exemption expiration concerns for EU or similar markets. The part ships in Tape & Reel or Cut Tape options, which is the standard for this package size and suits both prototype pick-and-place and volume reels.
Package and mounting — what to expect on the board
The 10-UFDFN package with supplier device package 10-DFN (3x2) is a small, leadless DFN. Surface-mount only; no through-hole variant exists.