IT3/IT5
Connector System
PWB
A
SSEMBLY
N
OTES
Document Number:
ETAD-F0458
Revision 3.10
Page
34
of
73
7.6 Nitrogen Environment
The use of nitrogen to inert the reflow process
can
:
1.
improve solder wetting by limiting oxidation on metal surfaces
2.
allow lower peak temperatures and/or lower times above liquidus
3.
improve the cleanability of flux residues
The benfits of using nitrogen increase as oxygen levels are decreased; optimum oxygen levels
between 100 and 1500 ppm must be determined by the assembler.
Generally speaking, nitrogen inerting opens the reflow window for most elctronic
components. The
use of nitrogen
in the reflow process will likely improve the soldering
preformance of the
IT3/IT5
connector receptacle, but it
is not required
.
7.7 Double-sided and Inverted Reflow
The
IT3/IT5
receptacles are compatible with the double-sided and inverted reflow
soldering.
Each receptacle has a low profile and a relatively light weight. The weight-to-ball ratio for
receptacles is less than 0.025 g/ball, and they have been successfully assembled in inverted
positions in production environments. While the IT3 plugs are also compatible with the
double-sided reflow soldering, please be cautious of the inverted reflow soldering with the
plugs. Thermoset plastic can be used to bond the standoffs of a plug to a PCB, thus creating
extra adhesion to prevent the plug from potentially falling out during the inverted reflow
soldering.
7.8 Mixing Tin-Lead and Lead-Free
The
IT3
connector receptacle is available in both tin-lead and lead-free configurations and
IT5
connector receptacles is available in lead-free configuratios. Therefore,
mixed metals systems
should not be considered
. However, if a situation requires mixing alloys on an assembly, it is
not advisable to use tin-lead components in lead-free processes
; large solder voids can
result.
Lead-Free components may be used in tin-lead processes
, but must reach
peak
temperatures above 221
o
C
to ensure full collapse and homogeneous joint microstructure.
If
mixed metals systems are under consideration, please contact product designers for approval
prior to assembing connector receptacles.
Nov.1.2022 Copyright 2022 HIROSE ELECTRIC CO., LTD. All Rights Reserved.
