300A mosfet for 48V hot-swap controllers

Rohm has designed a mosfet for high-current 48V hotswap controllers in data centres.

Rohm DFN8080T8 package for hot swap mosfet

RY7P250BM is a 100V device nominally rated at 300A and comes in an 8 x 8mm DFN8080 package.

Rohm hot swap mosfet web

“In hot-swap circuits used to safely replace modules while servers remain powered on, mosfets are required that offer both wide safe operating area and low on-resistance to protect against inrush current and overloads,” according to the company.


At switch-on, the device is rated for 16A from 48V for 10ms, or 50A from 48V for 1ms, “enabling support for load conditions conventional mosfets struggle to handle, it said.


To minimise constant dissipation during normal operation, maximum on-resistance is 1.86mΩ (10Vg, 50A drain, 25°C junction).

Total gate charge, which is less important away from dc-dc converters, is between 105 and 240nC (50V, 50A 10Vg).

Safe operating area curves can be found on this RY7P250BM data sheet

Earlier this year, the same company announced a 5 x 6mm DFN 30V mosfet for hot-swap controllers.

Steve Bush

Steve Bush is the long-standing technology editor for Electronics Weekly, covering electronics developments for more than 25 years. He has a particular interest in the Power and Embedded areas of the industry. He also writes for the Engineer In Wonderland blog, covering 3D printing, CNC machines and miscellaneous other engineering matters.

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