International Rectifier (IR) Introduces AC-DC Synchronous Rectification and ORing MOSFETs with Benchmark-Low On-State Resistance

International Rectifier IRFB3507 IRFS3507 IRFSL3507 IRFB3307 IRFS3307 IRFSL3307 IRFB3207 IRFS3207 IRFSL3207 IRFB4610 IRFS4610 IRFSL4610 IRFB4410 IRFS4410 IRFSL4410 IRFB4310 IRFS4310 IRFSL4310

November 16, 2004 -
International Rectifier (IR) announced a new range of 75V and 100V HEXFET® MOSFETs specifically for AC-DC synchronous rectification (SR) and ORing circuits. The new MOSFETs feature benchmark low on-resistance (IRFB4310 [100V] RDS(on) =7mOhm; and the IRFB3207 [75V] RDS (on) =4.5mOhm) to improve efficiency and power density in laptop/LCD adaptor and server AC-DC SMPS applications.

The new devices are suitable for the secondary side of many different AC-DC topologies including flyback, half-bridge, full-bridge and forward converters. Historically, Schottky diodes were used as output rectification devices for high power density SMPS. Significant efficiency improvement can be gained by replacing Schottky rectifiers with synchronous rectification MOSFETs.

AC-DC Synchronous Rectification and ORing MOSFETs

Depending on application details, the new SR MOSFETs enable higher efficiencies and may allow a "two-for-one" exchange for competing devices to reduce component count, save PCB area and increase power density. In addition, IR's selection of packages enables a simplified performance upgrade path for existing designs.

The new 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" (RoHS) directive in the newest SMPS solutions without any compromise in performance. The lead-free versions are the same price as standard parts. See the International Rectifier Lead-free products FAQ for more details.

Voltage(V) IDMax.25°C(A) RDS(on) Typ.(mOhm) RDS(on) Max.(mOhm) QGTyp.(nC) QGDMax.(nC) TO-220 D2Pak TO-262
75 97 7.1 8.8 79 118 IRFB3507/PbF IRFS3507/PbF IRFSL3507/PbF
130 5 6.3 112 168 IRFB3307/PbF IRFS3307 IRFSL3307
180 3.6 4.5 176 265 IRFB3207/PbF IRFS3207 IRFSL3207
100 73 11 14 77 116 IRFB4610/PbF IRFS4610/PbF IRFSL4610/PbF
96 8 10 109 164 IRFB4410/PbF IRFS4410 IRFSL4410
140 5.6 7 172 257 IRFB4310/PbF IRFS4310 IRFSL4310
Note: "PbF" denotes lead-free version available.

Availability and Pricing
The new AC-DC SR HEXFET MOSFETs are available immediately. Pricing begins at US $0.95 each for the IRFB4610 in 10,000-unit quantities.

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