LM5026: Screen printing problem

Jerry Hsueh

Part Number: LM5026

During the use of BTX LM5026MTX/NOPB, it was found that the silk prints behind the same batch of materials were different. Why?

Thanks,

Jerry

over 6 years ago

0 Peter Meaney over 6 years ago

TI__Mastermind 31580 points

Hi Jerry

Its possible that the die was packaged at two different sites let me check with the factory.

Regards

Peter

0 Jerry Hsueh over 6 years ago in reply to Peter Meaney

Expert 2730 points

Hi Peter

OK, thank you.
Does the factory have a reply?

Regards
Jerry

0 Jerry Hsueh over 6 years ago in reply to Jerry Hsueh

Expert 2730 points

Hi Peter,

Two different silk prints appeared on the same plate, which were never encountered.
If there are two trays, this situation can be understood.

Regards
Jerry

0 Peter Meaney over 6 years ago in reply to Jerry Hsueh

TI__Mastermind 31580 points

Hi Jerry,

Sorry for the slow response here, let me chase the factory again.

Regards

Peter

0 Peter Meaney over 6 years ago in reply to Peter Meaney

TI__Mastermind 31580 points

topside marking.docxHI Jerry,

The response is below, I think this answers your question.

On the bottom surface shown in the pictures there is an imprint in the mold compound (not silk screen) that comes from the mold cavity of the die when it is molding the plastic package. Different AT sides use different imprints to help them track the mold die and cavity that molded a particular unit. This is just for traceability and should not be something that a customer pays attention to. The customer should just pay attention to the top symbol from the laser mark on the top of the package.

For the LM5026MTX/NOPB, the top symbol looks like below layout. The customer should only care about the LM5026 on line 2 to confirm the correct device. The top line is our LTC (lot trace code) and it changes for each assembly lot – TI can use this for traceability.

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LM5026: Screen printing problem