What the 3.7V threshold means for your rail
The MAX6380UR37+ is a single-channel voltage detector with a 3.7V threshold — it asserts a reset when the monitored supply drops below that level. For a 3.3V rail, this threshold sits above the nominal voltage, so the part is not a direct undervoltage lockout for a 3.3V core; it monitors a 5V or 3.6V rail where the 3.7V trip point catches a brownout before the downstream logic loses state. The active-low, open-drain output pulls low on a fault and requires an external pull-up resistor to the monitored rail or to the downstream logic's VCC. This lets the reset signal level-shift to match the load — a 1.8V microcontroller can pull up to its own supply, while the detector itself runs from the monitored voltage.
Package and temperature grade
Housed in a 3-pin SOT-23-3 (TO-236-3, SC-59), the part fits a standard small-signal footprint. Surface-mount assembly with the SOT-23-3 body means the PCB layout follows the same land pattern as hundreds of common transistors and detectors — no special thermal pad or via array needed.
Analog Devices lists the MAX6380UR37+ as active in its current product portfolio. No end-of-life notice, no last-time-buy window — the part is in standard production and available through authorized distribution channels. Because it is a current-production line, the BOM position is not at risk of sudden obsolescence. Sourced and quoted to order against your quantity; availability and pricing confirmed at RFQ time.