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TPS3421: TPS3421EGDRYT

SHAWN FONG
Intellectual 490 points
Part Number: TPS3421

Hi experts, 

Our partner observed these unidirectional marks on multiple pieces on the bottom pads of the chip. 

Please advise:

1. if this is common occurrence during production

2. how did such marks occur. 

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/resized-image/__size/320x240/__key/communityserver-discussions-components-files/196/IMG_5F00_1093.JPG

/resized-image/__size/320x240/__key/communityserver-discussions-components-files/196/0842.Bottom-View.jpg

Thanks in advance!