INTERNATIONAL Rectifier has released a range of 75V and 100V HEXFET MOSFETs for ac-dc synchronous rectification and ORing circuits. The 75V IRFB3207 has an RDS (on) of 4.5mΩ and the 100V IRFB4310 has an RDS(on) of 7mΩ.
They are suitable for the secondary side of many ac-dc topologies including flyback, half-bridge, full-bridge and forward converters. Significant efficiency improvement can be gained by replacing Schottky rectifiers with synchronous rectification MOSFETs.
The SR MOSFETs can reduce component count, save PCB area and increase power density. The selection of packages allows a simplified performance upgrade path for existing designs.
The 75V and 100V devices are available in TO-220, D2Pak and TO-262 qualified to Q101 grade and moisture sensitivity level 1 (MSL1). Lead-free packages are also available to help customers meet the Restriction of the Use of Hazardous Substances in Electrical and Electronic Equipment directive in the newest SMPS solutions.
The lead-free versions are the same price as standard parts.