Vishay Expands 12V TrenchFET® Gen III Power MOSFET Family
Vishay Intertechnology, Inc. expanded its family of Gen III TrenchFET® power MOSFETs down to 12V with the release of a new n-channel device offering what is described as the industry’s lowest on-resistance and on-resistance times gate charge for a device with this voltage rating.
The 12V SiR494DP features a maximum on-resistance of 1.2mΩ at a 10V gate drive and 1.7mΩ at a 4.5V gate drive. On-resistance times gate charge, a key figure of merit (FOM) for MOSFETs in dc-to-dc converter applications, is 85nC at 4.5V.
Compared to the closest competing devices optimized for low conduction losses and low switching losses, these specifications represent an improvement for on-resistance of 40% at 10V and 35% at 4.5V, and a 29% lower FOM. Lower on-resistance and gate charge translate into lower conduction and switching losses.
The Vishay Siliconix SiR494DP will be used as the low-side MOSFET in synchronous buck converters with low input voltages (5 to 3.3V), in OR-ing applications with low output voltages (5V, 3.3V, and below), and in a wide range of systems using point-of-load (POL) power conversion with input voltages of 5 and 3.3V, where its low conduction and switching losses will enable more efficient use of power.
According to the company, for applications with low output voltages, a 12V drain-to-source rating may be perfectly adequate, but until now designers were forced to use 20V devices, especially if they were looking for the combination of the lowest available on-resistance and a 20V gate-to-source drive. The SiR494DP is said to be the first power MOSFET to combine all three: VDS = 12V, VGS = ± 20V, and on-resistance of just 1.2mΩ at a 10V gate drive.
The new power MOSFET is offered in the PowerPAK® SO-8 package. The device is lead (Pb)-free, halogen-free according to IEC 61249-2-21, compliant with RoHS Directive 2002/96/EC, and is 100% Rg- and UIS-tested.
Samples and production quantities of the SiR494DP are available now, with lead times of 10 to 12 weeks for large orders. Pricing for U.S. delivery in 100,000-piece quantities starts at $0.60 per piece.
