Datasheet

8 Catalog E 074473 12/08 Edition 7 www.erni.com
1.27 mm Connectors SMC
Overhead Soldering
PCB side 1 Solder paste printing / Component
assembly / Reflow solder process
PCB side 2 Solder paste printing / Component
assembly / Reflow solder process
PCB Layout for Right Angle Connectors
For industrial solutions, PCBs today are almost always
assembled on both sides. The circuits are often very com-
plex and in most cases it is not possible to assemble large
components, such as connectors exclusively on one side.
This leads to an increase of the importance of overhead
solder able components.
Overhead soldering does not imply to the often implicated
gluing and dip soldering process of an SMT assembled
backplane, instead it is a two sided reflow solder process
without an additional gluing process.
ERNI SMC connectors apply to this demand and are there-
fore suitable for overhead SMT soldering. While soldering the
2nd side, SMT overhead connectors are found on the “solder”
side, meaning on the upside down side, whereas this already
soldered side is completely melted again. The components
have to be held up by adhesion and cohesion forces of the
liquid solder paste. The adhesion forces are very critical and
they grow proportional with the size of the solder pad.
Adjusting the size of the solder pad according to the weight
of the connector, assures that the components will definitely
stay in their position. This enables us to offer you an additional
excellent option from our SMC family.
a34
a1
2,2
0,8
0,3
1,27
2,21
1,2
1,4
33 x 1,27 =
1,57
41,91
±0,03
±0,05
-0,03
46,33
1,6
±0,03
7,6
3,27
0,8
Layout for vertical versions complies with the standard layout.