The Analog Devices LTC4365CDDB-1#TRMPBF is an overvoltage and undervoltage protection controller that monitors a supply rail and drives an external N-channel MOSFET to disconnect the load when the input voltage goes outside a programmed window. It works across a 2.5V to 34V supply range, drawing only 125µA quiescent current — low enough to leave it powered continuously on a battery bus without noticeable drain.
The 2.5V to 34V input range covers common rails like 3.3V, 5V, 12V, and 24V with margin. If your design runs on a 5V bus and you want to clamp off anything above, say, 5.5V, this part handles it without an external regulator. The 125µA supply current is the current the chip itself burns — not the load current — so it can sit on the input side of the protection FET and stay alive even when the output is disconnected. That matters for always-on protection in remote sensors or POE-powered devices where every microamp counts.
8-WFDFN exposed pad package (8-DFN 3x2 mm), surface mount. Operating temperature 0°C to 70°C.
For a repair bench or a production line filling a BOM line, this is a straightforward part to bring in without worrying about a sudden obsolescence surprise.