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TCA9416: Issue with TC9416 not functioning as expected

Colin Waddock
Prodigy 20 points

Part Number: TCA9416

I have a 1V8 I2C bus which I have added 3V1 and 3V3 sections to using the TCA9416 (in the X2SON footprint). In both cases the part fails to function as expected and holds SCLK/SDA lines around 0.3V regardless of what the master tries to do with them. This issue is present on multiple boards.

I removed the TCA9416 parts and confirmed that all the other devices on the bus sections function as expected. I then wired TCA9416 parts in the SOT-23-THIN footprint and that works!

I did consider the possibility that the soldering of the devices could be part of the problem but looking at the possible combinations for shorts I do not see any that would explain the voltages I see on the comms lines.

Have there been any batch issues reported with the X2SON footprint parts? Assuming the two footprints have identical internals I can't think of anything aside from multiple identical part failures which would explain the problems I have been having.

  • 0
    TI__Guru 60238 points

    Hi Colin,

    It looks like a couple of units returned in the past 3 years. The root cause was determined to be assembly related with corrosion being part of the cause.

    It is possible that it could be related especially if the time of which you ordered the part lines up with the quality return timeline. 

    DTM parts are also difficult to solder, it could be that one of the pins was shorted to GND and the the bus was locked up. However, I would only expect SDA to be locked low since GND is near SDA. X-ray would be best to tell, but is difficult to do. 

    If SCL is getting locked up, maybe there is a different root cause, since SCL is far from GND. 

    If you would like to go through the QEM process, we can start here: https://www.ti.com/support-quality/additional-information/customer-returns.html , to submit the quality intake form. 

    Regards,

    Tyler