What is the meaning of the suffix that indicated on the label itself?

[LWU.31]

Dear Support,

Good day.
What is the meaning of the suffix that indicated on the label itself for the second line part no.?
Is it because of the COO that makes the suffix different? Or it’s just the internal code for STMIC?

[Jojo_]

Hello,

The "KXB" vs "KHB" suffix difference is due to the difference in assembly line.

It is explained in a process change notification released in 2018. Here's the link:

https://www.anglia.com/registration/pcn_ptn/docs/pcn/st_PCN%20MDG_18_11130_Summary.pdf

(You can check page 2 for a quick explanation)

Hope this helps.