Manufacturing And Soldering - Quectel BC65 Hardware Design

NOTES
1)
1. This floor life is only applicable when the environment conforms to IPC/JEDEC J-STD-033.
2. To avoid blistering, layer separation and other soldering issues, it is forbidden to expose the modules
to the air for a long time. If the temperature and moisture do not conform to IPC/JEDEC J-STD-033 or
the relative moisture is over 60 %, it is recommended to start the solder reflow process within 24
hours after the package is removed. And do not remove the packages of tremendous modules if they
are not ready for soldering.
3. Take the module out of the packaging and put it on high-temperature resistant fixtures before the
baking. If shorter baking time is desired, see IPC/JEDEC J-STD-033 for baking procedure.

7.2. Manufacturing and Soldering

Push the squeegee to apply the solder paste on the surface of stencil, thus making the paste fill the
stencil openings and then penetrate to the PCB. The force on the squeegee should be adjusted properly
to produce a clean stencil surface on a single pass. To ensure the module soldering quality, the thickness
of stencil for the module is recommended to be 0.15–0.18 mm. For more details, see Document [4].
It is suggested that the peak reflow temperature be 238 º C to 246 º C, and the absolute maximum reflow
temperature be 246 º C. To avoid damage to the module caused by repeated heating, it is strongly
recommended that the module should be mounted after reflow soldering for the other side of PCB has
been completed. The recommended reflow soldering thermal profile (lead-free reflow soldering) and
related parameters are shown below.
Temp. (°C)
246
238
220
200
150
100
Figure 36: Recommended Reflow Soldering Thermal Profile
BC65_Hardware_Design
Soak Zone
A
Max slope: 1 to 3 °C/s
NB-IoT Module Series
BC65 Hardware Design
Reflow Zone
Max slope:
Cooling down slope:
C
2 to 3 °C/s
-1.5 to -3 °C/s
B
D
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