Hello,
the components could be :
Marking "BCU":
- [Seiko] S-814A30AMC
- [Torex] XC6115C326MR
Marking "BCW"
- [AME] AME8510AEEVBFE23
- [Seiko] S-814A32AMC
The last letter is often a date code.
Hope this help you,
Best Regards,
Wil15
---------- Post added at 16:19 ---------- Previous post was at 15:19 ----------
It could also be this component :
Microchip TC1272ASVNBTR
the datasheet indicates a marking code like BC** with ** for Lot number and Year of manufacturing :
https://ww1.microchip.com/downloads/en/DeviceDoc/DS-21877a.pdf
Best Regards,