Description
The M4TXX-BR12SH SNAPHAT® top is a detachable lithium power source for ST’s nonvolatile TIMEKEEPER® surface-mount SOIC (MH) 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.

Features
■ Provides battery backup power for 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-BR12SH = 48 mAh
   – M4T32-BR12SH = 120 mAh
■ Keyed insertion to ensure proper assembly
■ Removable for replacement and proper
   disposal
■ Pb-free package
■ Available in Ecopack® packages, tubes or tape & reel