This is a kit to build your own drop-in replacement for RTC modules with solid body. 

The kit includes the following items:
1 - NW12887 PCB
3 - 1x12 Machined Pin Header (1 excess header in case one is damaged during assembly)
1 - CR1220 SMD Battery Holder
1 - 32.768 MHz crystal
1 - BQ3285LF RTC IC SSOP24

Important Notes:
  • This does NOT include the battery, or a socket (recommended).
  • This is NOT a beginner project, and requires soldering a few small SMD components. The RTC IC may give you trouble. A generous amount of quality flux and patience is recommended.
  • The pin headers are fragile. If you bend a pin, you might as well scrap it. The pins will easily break off if bent. We have included an extra header just in case. If you are soldering this directly to the board, you may opt to use square pin header instead of the included machined.
  • The legs on the crystal need to be bent and cut to length before soldering.
  • I solder the components in this order: RTC IC, Crystal, [Clean Flux], Pin headers (where they wont obstruct battery holder), [Clean Flux], battery holder, then the last few header pins next to the battery holder.
We sell assembled units here: https://www.ebay.com/itm/134217827379

Such modules were widely used on 486 and Pentium mainboards. After years, the battery inside of such modules dies and there is no way to exchange it. With a dead battery, BIOS settings can not be saved and many mainboards will not boot properly. This alternative solution has a socket for CR1220, and the battery can be easily replaced again.

This part should be compatible with following RTC modules:

Dallas DS1287 / DS12887 / DS12B887
Benchmarq BQ3287
ODIN OEC12C887

Customers have reported that this module is a compatible replacement for these modules, although I have not tested myself:
Twinhead TH1287

Thanks to Necroware for this project. You can view the project details on his GitHub page.

Will carefully package for safe shipment.