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About the Tape size.

Part Number: TLV4021

Hi TI expert

We are now use TLV4021, then, we nned to know the size of the Pocket.

reading from below image in datasheet, the A0 & B0 size is 0.84mm, 

we found the real size is over size, It is the bottom size of the pocket.

This problem troubles our SMT project,  so, we want to know the tolerance of the size.  datasheet says *All dimensions are nominal, what's this meaning.

Thanks.