The substititution table for XB2B give the reference ZB4BS8445 as substitution of the reference XB2BS8445.
But this reference is not a valid reference.
There must be a mistake in the cross reference files and in the commercial data base because the logical cross reference of the XB2BS8445 is the XB4BS8445.
The commercial data base has been updated in january 2010 the 11st but the cross reference list is still wrong.
This information was given to the marketing activity.