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ENeoh.1
ENeoh.1
Associate III
August 20, 2021
Question

Ghosting mark at back of the part STM32F407ZGT6

  • August 20, 2021
  • 11 replies
  • 2086 views

Please advise whether see before the below picture regrading the ghosting mark on the back of the part ? It is due to MFG fabrication matter which cause this issue.

This topic has been closed for replies.

11 replies

waclawek.jan
waclawek.jan
Super User
August 20, 2021

There is no picture. Please use the "picture" icon below the editor window. Drag and drop does not work here.

JW

ENeoh.1
ENeoh.1Author
Associate III
August 24, 2021

0693W00000DqANLQA3.jpg

ENeoh.1
ENeoh.1Author
Associate III
August 24, 2021

Notice the ghost marking are mainly COO Philippines . Can you confirm this are acceptable

Uwe Bonnes
Uwe Bonnes
Chief
November 11, 2021

Tell about how the device was handled before. Is in genuine out of the reel/tray? Or was is perhaps hand handled and stocked on another part. The ghosting looks like the some marking from another part.

ENeoh.1
ENeoh.1Author
Associate III
November 11, 2021
Hi All
We bought the part factory sealed and found this double imaging (ghost making) seen on the back of the chip
We have realise many of the batches faced similar issue. We are reaching for your advise
Regards
Elsie Neoh
Tesla DeLorean
Tesla DeLorean
Guru
November 11, 2021

If bought through legitimate channels you should be able to get lot traceability via ST directly.

The mirrored markings are consistent with top-side markings for STM32F407 parts manufactured at Amkor ATP Philippines

@Heather ROBERTSON​ ​ 

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ENeoh.1
ENeoh.1Author
Associate III
November 12, 2021

Hi All,

We have bought the parts in factory sealed pack. At the inspection area , we found this double imaging (ghost making) seen on the back of the chip

We have realize many of the batches has faced similar issue. We are reaching for your advise.

Regards

Elsie Neoh

waclawek.jan
waclawek.jan
Super User
November 12, 2021

Tray or tape?

I don't remember seeing this, but truth is, I don't think I've ever looked at the underside of any STM32...

But please note that this is a primarily user-driven forum. You may want to contact ST directly, through FAE or through the web support form.

JW

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