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THVD1420: Pin with vinyl, is this the normal proecess?

Part Number: THVD1420

Hi TI Team

We purchased THVD1420DRLR from TI Store, Lot No. 2402947PHI . but we found that there is something likes vinyl on the pin .(pls find the picture as below )

And we bought this parts twice,the new coming goods also the same. Could you kindly help to check below question:

1)Is this a normal process? 

2)  Whether it will affect product performance?

3)  Could we use this product ? 

Looking for forward your reply, thank you .