M4T28-BR12SH Просмотр технического описания (PDF) - STMicroelectronics

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производитель

M4T28-BR12SH

TIMEKEEPER® SNAPHAT® (battery and crystal)

STMicroelectronics 

Mechanical information

4

Mechanical information

M4T28-BR12SH, M4T32-BR12SH

Electrical connection to the SOIC is made through four pins that connect to the four press

fitted sockets at each end of the SOIC. Critical contact points between the pins and sockets

are gold-plated to resist oxidation. Internally, each socket contains six independent contact

fingers to form redundant connections between the two components. These sockets were

designed with high point contact force to provide the lowest possible contact resistance. The

SNAPHAT® top also incorporates four molded-in retaining clips which hold onto the ends of

the SOIC insuring mechanical and electrical connection even under severe mechanical

shock and vibration. The combined SOIC and SNAPHAT assembly can sustain shock levels

in excess of 100 g without separating. This package also passes variable frequency testing

in accordance with MIL-STD-883, method 2007.2, condition A.

Figure 2 illustrates the affect of repeated insertion and extraction of the SNAPHAT top to the

SOIC. The force required to extract the SNAPHAT, and then to re-insert it, reduces each

time. After four or five extractions, the reduction starts to become unnoticeable and the force

required remains at a fairly constant figure. Typically, though, the SNAPHAT will only need to

be extracted and re-inserted once in its lifetime.

Figure 2. SNAPHAT® insertion/extraction forces

15

12.5

Average Insertion

Average Extraction

10

7.5

5

2.5

0

1

2

3

4

5

6

7

8

9

10

Number of Extractions

AI02526

8/16

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