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R-Tools Heatsink Modeling Online

 R-TOOLS MAXX, the New Version of R-Tools, is Coming in January 2021! 

R-TOOLS MAXX logo and simulation

R-TOOLS MAXX delivers advancements and improved features that help facilitate the use of the software. R-TOOLS MAXX has a modern and fresh visual design, an upgraded graphical user interface, and simulation visuals. In response to the design needs of today’s market, R-TOOLS MAXX draws from the latest simulation modelling software to provide users a more robust and accurate calculation tool.

The new R-TOOLS MAXX heat sink selector tool will replace the current R-Tools software.

Important Note to Current R-Tools Users

R-TOOLS MAXX is built on a new advanced simulation code and user interface. It is built from ground up and is not compatible with the older R-tools files. The current version of R-Tools will be discontinued effective November 30th, 2020. This means current R-Tools users must finish their projects* by November 30th, 2020. After this date the legacy version of R-Tools software will be permanently removed from the Mersen website and no longer available.

* Please note current projects saved in R-Tools will NOT be transferred to the new R-TOOLS MAXX as the two versions are not compatible. Should users fail to finish their current projects in R-Tools by November 30th, 2020 their files will be lost and cannot be recovered.

For all additional information on R-TOOLS MAXX  please contact the Mersen Technical Support team at or call us at 1-978-465-4853 in North America.


R-Tools Flow


Mersen’s innovative R-Tools GEN II makes it easy to quickly and accurately provide you a solution for your project. R-Tools GEN II is completely interactive and available online 24/7. Enter the boundary conditions for your project and the tool will choose a heatsink that best fits your criteria. Built on a powerful engine, the software  provides detailed solutions with minimal time and allows users to create the thermal design of the heatsink with the optimization of the electrical and manufacturing elements prior to any prototype builds and testing. This invaluable resource reduces design time and increases the reliability in your finished product.

R-Tools 1 Graph

Important Discontinuation Notice for R-Tools GEN III users

In March 2015, we launched a “Beta” version of the new R-tools GEN III Thermal Modelling Software for users to try out and to experience the new features of the software. We gathered our customers' valuable feedback and have started an additional development phase to continue improving the R-Tools GEN III in order to create a more enhanced working platform for R-Tools GEN III.  During this development phase, we opted to remove the R-Tools GEN III from Mersen website and to direct our users to continue using the proven R-Tools GEN II software as the only available thermal modelling tool on line.

We apologize for any inconvenience this may have caused. Please note that the R-Tools GEN III and R-Tools GEN II program files are not interchangeable. We kindly ask our users to either continue their designs on R-Tools GEN II or if you were an R-tools GEN III user, to register for R-Tools GEN II on line.


Go to R-Tools GEN II

Link to Cooling page

Link to Bus Bar page