TMS320C6414T: Bake Out Temperatures and Bridging

Hello Colin Campbell

Thank you for the query.

Could you please help me understand if this issue is seen on a specific batch or across multiple batches and board assembly lots.

Regards,

Sreenivasa

Hello Kallikuppa,

From what we have seen it has been on two different date codes so far that I can tell. As I mentioned we have used these parts since 2011 and not seen this issue to the best of my knowledge. I am unsure how to get the Date Code from the part marking, but this is what appears unique on the parts themselves:

TMS320C6414TBGLZA6: $N20 - 28ZC599

TMS320C6414TBGLZ6: $N20 - 85AN05W

Hello Colin Campbell

Let me check.

Were the devices stored for a long duration before use?

regards,

Sreenivasa

Hello Kallikuppa,

I believe the date codes from our suppliers state that the "A6" variation could have either been from late 2022 or early 2023. I am unsure on the date code for the "6" variation. Hopefully you will be able to discern this through the part markings.

Hello Colin Campbell

Thank you. I have reached out to the team internally. 

Kallikuppa Sreenivasa said:

Were the devices stored for a long duration before use?

Any thoughts on this question.

Regards,

Sreenivasa

Hi Kallikuppa,

Sorry, by saying that they were from 2022 to 2023 from our suppliers I was alluding to the fact that they were stored for a long duration. We did bake these before use though according to J-STD-033. We even baked it a second time after the first bridging occurred to double check that the baking was properly done.

Hello Colin Campbell

Noted. I am checking with the team internally.

Regards,

Sreenivasa

Hello Kallikuppa,

Just wanted to check in on this and see if you have any updates.

Hello Colin Campbell

Please refer inputs i received from the team.

Regards,

Sreenivasa

standard label on the dry pack has instructions.docx

Hello Kallikuppa,

Thanks for the document. So if we followed these bake-out procedures correctly, do you have any ideas of why we would suddenly be seeing bridging issues with this batch of parts? 

Hello Colin Campbell

Thank you.

Please refer below inputs i received 

the customer description is too vague. I don’t know what “some issues with bridging” means. Some evidence would be needed if we are to comment further.

Regards,

Sreenivasa

Hello Kallikuppa,

Sorry for the late response on this, I have been out of town.

We are unsure of why these are suddenly bridging during reflow on this batch so I do not have additional evidence to be provided.

Going back to the original question. Could I get confirmation that note 5 of the J-STD-033D table that was posted above does not apply to these parts? And that 96 hours at 125C is the correct bake-out temperature?

We want to be able to rule out for sure that these have been properly baked per the manufacturer and that moisture is not the issue.

Hello Colin Campbell

Thank you.

Let me check with the team.

Regards,

Sreenivasa

Hello Colin Campbell

Please refer below inputs i received.

Regards,

Sreenivasa 

Hello Kallikuppa,

Sounds good! Thanks for the help on this.