MAX5921AESA+

The MAX5921AESA+ from Analog Devices is a positive-voltage hot-swap controller IC with an integrated circuit breaker function, optimized for safely inserting and removing boards in live backplane applications. It provides adjustable overcurrent protection, undervoltage and overvoltage monitoring, and a fault status output to enable rapid isolation under fault conditions. An internal charge pump drives an external N-channel MOSFET, allowing precise control of inrush current and limiting power dissipation during startup. The device supports a wide operating voltage range and includes a programmable timeout period to accommodate varying load capacitance without nuisance tripping.

Typical applications include telecom infrastructure, enterprise networking equipment, industrial servers, and automated test systems where uninterrupted operation and field-replaceable units are critical. In aerospace and defense environments, the controller’s circuit breaker accuracy helps protect sensitive loads from overstress during hot-swap events. The SOP-8 package offers a compact footprint suitable for high-density PCB layouts, while the -40°C to +85°C industrial temperature range ensures reliable performance across diverse thermal environments. As an active product from a leading manufacturer, the MAX5921AESA+ carries low obsolescence risk; engineering teams requiring extended temperature or military-grade screening should verify compliance with MIL-PRF-38535 or similar standards, as this version is not inherently military-qualified.