Any BB, B1, B2, B3, B9, BQ, CA or CJ will be coldbugged. There are some other coldbugged chips as well, but they're quite rare so don't bother about them
The week number usually gives you an idea if it MAY have some potential or not. It's hard to remember all of them, but 0602, 0614, 0626 are some of the better ones.
The LEAST coldbugged stepping you can find would be BF I think. BY, BN and BH, BW and BL (these vary a bit, though) are also very dryice/phase friendly.![]()
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