This is information on a product in full production.
February 2014 DocID013125 Rev 4 1/16
M4T28-BR12SH
M4T32-BR12SH
Real-time clock and TIMEKEEPER
®
SNAPHAT
®
battery with crystal
Datasheet - production data
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-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
Description
The M4Txx-BR12SH SNAPHAT
®
top is a
detachable lithium power source for ST’s serial
real-time clock and non-volatile TIMEKEEPER
®
surface-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.
SNAPHAT
®
battery with crystal
www.st.com