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CSD19505KTT: Damaged MOSFET due to soldering

Julia Jonsson
Prodigy 30 points

Part Number: CSD19505KTT

Hi!

I tried to replace a damaged a CSD19505KTT mosfet in a PCB for trobleshooting. I desoldered a functioning mosfet from a fresh PCB and "hand soldered" in the PCB for troubleshooting. I needed to warm up during a long time to be able to desolder and solder the drain in the pad with thermal vias. My question is: Is it common the soldering heat dammages the MOSFET and shortcircuts drain-source?  

 

  • 0
    TI__Mastermind 40580 points

    Hello Julia,

    Thanks for the inquiry. I do not believe it is very common to damage the MOSFET in D2PAK package by de-soldering it from and soldering it to the PCB. However, applying too much heat for too long could cause the internal solder connection to the drain tab to reflow. This might cause drain-source short. Also, you should preheat the device on a hot plate or using a hot air pre-heater to heat the board from the bottom before exposing it to reflow temperatures. A sudden temperature change can stress or crack the die causing FET damage. The link below is to some rework instructions. Please let me know if you have any questions.

    Rework instructions

    Best Regards,

    John Wallace

    TI FET Applications