SOT23-6 hot-swap controller — what the package tells you about the board
The MAX5900LCEUT+T is a hot-swap controller in a SOT23-6 package — six pins, 0.95 mm pitch, about 2.9 mm × 1.6 mm body. That footprint fits into a tight power-sequencing slot on a 2-layer board without forcing a via farm under the part. It manages inrush current during board insertion into a live backplane, limiting the surge through the upstream supply rail. The SOT23-6 package keeps the thermal path short to the board copper — the exposed pad on the bottom side ties to the GND plane and pulls heat away from the die during a fault event.
Active lifecycle — no LTB window to chase
ROHS3 compliant per the manufacturer's declaration, so it fits into assemblies that require full RoHS exemption-free compliance under EU 2015/863.
The MAX5900LCEUT+T is sourced through independent distribution channels. Because it is an active part with no known counterfeit risk flagged in the supply chain, the sourcing desk treats it as a standard RFQ line — date-code and lot traceability are confirmed at order.