The M4Txx-BR12SH SNAPHATtop is a detachable lithium power source for ST’s serial real-time clock and non-volatile TIMEKEEPERsurface-mount SOIC package (28- and 44-pin). The SNAPHAT top contains both the battery and crystal and is designed to be “snapped on” after the SOIC is surface mounted on the PC board. Thus the two-piece solution prevents the battery and crystal from being exposed to the high temperatures of the surface-mount process. Key Features Provides battery backup power for serial real-time clock, non-volatile TIMEKEEPER and supervisor devices in the 28- or 44-pin SNAPHAT SOIC package Removable battery avoids heat associated with surface-mount process Snaps directly onto surface-mounted SNAPHAT SOIC Choice of battery capacities M4T28-B Keyed insertion to ensure proper assembly Removable for replacement and proper disposal Pb-free package Available in Ecopack packages, tubes
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