TPS548D22: Date code discrepancies between MFG label and part marking

Miranda,

Typically we can answer technical questions on this forum. These types of logistic questions will be difficult for us to track down. I can offer an opinion though. The date code "91" indicates January 2019. The box marking "8C, 92" most likely means units from December 2018 to February 2019. Labels would be pre-printed to span a period of lot date codes. I will try to verify that, but it may take quite some time.

Hi John,

Thank you for taking the time for confirming this label info. 

Below is a file from TI explaining different parameters on the label - How to Identify STC & LTC

https://e2e.ti.com/cfs-file/__key/communityserver-discussions-components-files/196/How-to-identify-STC-_2600_-LTC.PDF 

Under the Item section: Usually empty but in some cases may be populated with a Die Name or 2 character Year-Month codes to far right which must match 1st 2 characters of Assy LTC(s).

I understand that the label in general provides a time frame; however this TI document points out that it has to match with the actual part marking. 

Here is another example that contains the full lot#, same "8C" and "92" marking on the label, full 2500 pcs, but all parts marked as "91".  LOT# 1180915CL8

Can you help confirm if the LOT# and label also? Let me know your opinion. 

Thanks a lot.

Miranda,

It may be possible that the reel in question was assembled from multiple partial reels. My source sated that the label numbers in question were "representative", meaning the date codes within should be near in time, i.e. 8B, 8C, 91, 92, while the document you cite stated they must match. I know this may seem unreasonable, but can you check every part in that reel to see how nay different date codes are included? meanwhile I will present that document to my source, who is the lead project manager for his additional input.

Hi John,

For reference,  all 2500 pcs in the reel with LOT# 1180915CL8 showed marking "91". No other DC marking in the reel. Please help consult the lot and label info from your side.

Look forward to hearing from you soon.

Thanks.

Miranda,


Can you tell me where these were purchased (direct from TI, distributor, etc.)? It is possible they may have been re-packaged. Also, does the internal label on the foil packaging match the outer box?