M4T28-BR12SH M4T32-BR12SH Real-time clock and TIME.
STMicroelectronics
M4T28-BR12SH - Real-time clock and TIMEKEEPER SNAPHAT battery
M4T28-BR12SH M4T32-BR12SH Real-time clock and TIMEKEEPER® SNAPHAT® battery with crystal Datasheet - production data SNAPHAT® battery with crystal De.