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TPD4E001: Can't seem to understand why I keep smoking this part

Craig Rettew
Intellectual 965 points
Part Number: TPD4E001

I'm trying to use this part in a design that has a USB interface. The user will be plugging in a USB cable so I wanted to protect the downstream circuits from ESD. I'm not sure where I'm going wrong but when I plug the USB cable in, giving it power, this part burns up everytime. I've tried 4 different parts, confirmed I'm not shorting anything after soldering with a multi-meter, I've hooked it up to 3 different 5V sources, and I've confirmed my PCB is routed correctly. This part still let's the smoke monster out.

Am I connecting this wrong? In one of my tests, I just tried applying 5V from a bench power supply and it smoked it. I've also confirmed that I have the right package, SOT-23-6 (DBV). What am I missing?

  • TI__Genius 9456 points

    Hi Craig,

    I'm sorry to hear you're having this issue. The smoke monster is never fun to see.

    While your schematic seems correct, there are still other factors that could be causing this device to fail. So far, I have 2 possible theories:

    1.) You might be using the wrong pinout diagram for this part. For the DBV package, there is the TPD4E001 and TPD4E001R. The difference between the two is that the Vcc and GND pins are switched. If the VBUS is connected to ground, this will definitely burn up the device. Can you confirm which device/pinout you are using?

    2.) There might be an induced voltage if there is a significant distance between the connector and the device. Can you get an oscilloscope reading of each of these lines to determine the voltage the device is receiving?

    Please let me know if any of this needs clarification.

    Regards,

    Matt Smith 

  • in reply to Matt Smith
    Intellectual 965 points

    Oof! Turns out, I have the R version. I knew it was something like this, can't believe I missed that. Doh! Thanks.