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UCC28070: Looking for the meaning the silk screen on the chip.

Karl Zhang
Prodigy 10 points
Part Number: UCC28070

What the meaning of the slik screen on the 28070 chip? 

For example the slik silk screen shows three lines: 

1st line: 28070

2nd line: 33KG4

3rd line: AVRZ 

What do the 2nd and the 3rd line mean?