1 Reply Latest reply on Sep 22, 2015 4:01 AM by milostnik

    Soldering Problems with QFN thermal pad ?

    parth.sutariya

      Hello ,

       

      Will there be any soldering issues if copper is provided on the QFN thermal pad in all the layers that is outer as well as inner layers ?

       

      Best Regards ,

      Parth Sutariya

      Hardware CAD Engineer

      MATRIX COMSEC

      Vadodara , Gujarat

      INDIA

        • 1. Re: Soldering Problems with QFN thermal pad ?
          milostnik

          Hi Parth

          During the reflow soldering process the excess copper will absorb heat, thus the profile set for normal soldering might need to be corrected to compensate for this effect.

          If you need to do a rework, the excess copper will need to be heated as well. This can impact on the long term reliability of the board. Make sure your board is qualified for a higher number of thermal shocks. Like a minimum of 6: 1 HAL surface preparation, 2 reflow top, 3 reflow bottom, 4 selective wave soldering, 5 rework removal, 6 rework insertion.

          Hope this helps

            Matija