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Mobile IoT Authors: Steve Watts, Elizabeth White, Chris Fleck, Anders Wallgren, Pat Romanski

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Fairchild Semiconductor’s Dual Cool™ Package Improves Power Density and Performance in DC-DC Power Applications

Designers of DC-DC conversion applications are challenged with improving power density while saving board space and reducing thermal resistance. Fairchild Semiconductor’s (NYSE: FCS) new mid-voltage PowerTrench® MOSFETs with Dual Cool™ packaging technology are well suited to help with these design challenges.

Fairchild has expanded and improved its Dual Cool packaging portfolio, an industry-standard pin-out package with top-side cooling, to include a 40-100V mid-voltage series. Silicon technology advancements, paired with the Dual Cool technology, provide excellent switching performance as well as low junction-to-ambient thermal resistance that is four times less than the standard over-molded 5mm x 6mm MLP.

Devices included in the mid-voltage series include the 40V FDMS8320LDC, 60V FDMS86500DC, 80V FDMS86300DC and the 100V FDMS86101DC. These devices are synchronous rectifying MOSFETs that are suitable for use in DC-DC converters, telecom secondary-side rectification and high-end server/workstation applications. For additional information on devices available in the Dual Cool package, please visit our website at

Features and Benefits:

FDMS8320LDC (40V)

  • Max RDS(ON) = 1.1mΩ at VGS = 10V, ID = 44A
  • Max RDS(ON) = 1.5mΩ at VGS = 4.5V, ID = 37A

FDMS86500DC (60V)

  • Max RDS(ON) = 2.3mΩ at VGS = 10V, ID = 29A
  • Max RDS(ON) = 3.3mΩ at VGS = 8V, ID = 24A

FDMS86300DC (80V)

  • Max RDS(ON) = 3.1mΩ at VGS = 10V, ID = 24A
  • Max RDS(ON) = 4.0mΩ at VGS = 8V, ID = 21A
  • Industry’s lowest RDS(ON) by approximately 35% as compared to competitive solution with same voltage rating

FDMS86101DC (100V)

  • Max RDS(ON) = 7.5mΩ at VGS = 10V, ID = 14.5A
  • Max RDS(ON) = 12mΩ at VGS = 6V, ID = 11.5A

Packing and Pricing Information (in US 1,000 quantity pieces)

Samples available upon request - Delivery 8-12 weeks ARO

All devices in this product family are available in a PQFN 5x6 8L package and are priced at:

  • FDMS8320LDC (40V): $1.09
  • FDMS86500DC (60V): $1.16
  • FDMS86300DC (80V): $1.16
  • FDMS86101DC (100V): $1.09

Dual Cool packaged MOSFETs are part of Fairchild's industry-leading MOSFET portfolio. By understanding the demands for higher current DC-DC power supplies in smaller footprints for space constrained applications, as well as our customers and the markets they serve, Fairchild can tailor its unique combination of functional, process and packaging innovation into solutions that make a difference in electronic designs.

Fairchild Semiconductor: Solutions for Your Success™

Contact Information:

To contact Fairchild Semiconductor about this product, please go to:

For information on other products, design tools and sales contacts, please visit:

Note to Editor: For a datasheet in PDF format, please go to:

About Fairchild Semiconductor:

Fairchild Semiconductor (NYSE: FCS) – global presence, local support, smart ideas. Fairchild delivers energy-efficient, easy-to-use and value-added semiconductor solutions for power and mobile designs. We help our customers differentiate their products and solve difficult technical challenges with our expertise in power and signal path products. Please contact us on the web at

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