TW2851 - complete part number

Hello,

for an old project for CCTV automotive applications some years ago we have used TW2851 SOC. I know this product is obsolete, but we were able to find some pieces with part number TW2851-BB1-GR instead of TW2851-BB2-GR. As in the datasheet I have there is no mention of the BB2 code, I'm wondering if anybody could tell me the differencies between the two PN. Thanks a Million in advance.

Regards

Jack