International Rectifier Introduces New 40V Synchronous Rectification MOSFET Optimized for Telecom and Datacom Applications

International Rectifier IRF7842

May 19, 2004 - International Rectifier, IR® introduced the IRF7842, a 40V N-channel HEXFET® power MOSFET optimized for isolated DC-to-DC converters for telecommunications systems.

The 40V rating enhances reliability when used in secondary-side synchronous rectification circuits for telecom and datacom systems where a wide range input voltage of 36V to 75V is typically used. This can develop a voltage swing on the secondary side in the range of 5V to 12V, therefore requiring a 40V MOSFET since a 30V rated device does not provide the required voltage rating headroom. The new 40V device expands the IR offering of secondary-side power management switch devices for telecommunication systems.

The IRF7842 achieves 95.2% efficiency at 150W full load when used for secondary-side synchronous rectification in an isolated DC-DC bus converter featuring IR's IR2085S primary-side PWM IC. The IRF7842 also delivers as much as 0.5% higher efficiency when compared to industry-standard 40V devices in the same DC-DC bus converter.

IRF7842
Part Number BVDSS VGS RDS(on) max. @10V RDS(on) max. @4.5V Qg typ. @50% VDS QGD typ. Package
IRF7842 40V +/-20V 5mOhm 5.9mOhm 33nC 10nC SO-8

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