DS12887 RTC Drop-In Replacement
Replaces a Dallas DS12887 Real-Time-Clock chip, and provides user-replaceable battery so you don't have to replace the entire chip when it runs out.
Uses a large, common, CR2032 cell, found in supermarkets and dollar stores.
Battery is NOT included due to shipping regulations.
With the battery installed, it is slightly wider than a DS12887, so check your board for clearance.
Watch orientation when installing. The chip has a notch at the Pin-1 end.
Can almost always replace the older DS1287 as well, but some systems are picky.
DS12887+ is just RoHS-compliant DS12887, and this can replace that too.