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SN74AHCT00: SN74AHCT00DCK

shihming cheng
Prodigy 10 points
Part Number: SN74AHCT00


Tool/software: 

Hello! Sir 
 
My company previously purchased TI NAND IC, part number: SN74AHCT1G00DCK3

Occasionally, the NAND IC (see the following circuit diagram U14) on the circuit board will burn out during use. 

We think that this burning may be caused by ESD or surge current. Attached is the X-ray 2D photo of the burned IC. 

I wonder what you think about this bad phenomenon? In addition, in the application circuit, if we want to prevent this bad phenomenon, what suggestions do you have?

Thanks!
  • 0
    TI__Genius 14141 points

    Hi Shihming,

    I see in your schematic there is no bypass on the +5V going into the VCC pin of our device. This can cause some issues if your VCC becomes noisy, or unexpectantly changes. 

    See the Layout section of the datasheet.

    As for the failure without example waveforms of them failing there is not much I can do to support. I would recommend Reading up on System-Level ESD Protection Guide

    and potentially looking into our wide selection of ESD diodes on TI.com.

    Regards,

    Owen