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M4T28-BR12SH, M4T32-BR12SH

MECHANICAL INFORMATION

Electrical connection to the SOIC is made through

four pins that connect to the four press fitted sock-

ets 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 resis-

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 pass-

es variable frequency testing in accordance with

MIL-STD-883, method 2007.2, condition A.

Figure 3 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 3. SNAPHAT Insertion/Extraction Forces

0

2.5

5

7.5

10

12.5

15

1

234

5

6

789

10

Number of Extractions

Average Insertion

Average Extraction

AI02526