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Design considerations
- When a board is plugged into a live system, it is important the in-rush current is carefully controlled to protect the components on the board and ensure other parts of the system do not experience any power disruption.
- MOSFETs with a strong linear mode performance and enhanced safe operating area (SOA) are required to manage this current effectively and reliably
- Once the replacement board is safely installed, the MOSFET is turned fully ON. In this mode of operation, a low RDS(on) value is of primary importance, helping to keep temperatures down and system efficiency at a maximum

Nexperia in action
PSMN4R8-100BSE referenced in "Evaluating the ADM1272 High Voltage Positive Hot Swap Controller and Digital Power Monitor with PMBus"

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