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IMDES CREATIVE SOLUTIONS
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7.0 DUAL SIDED SMD SOLDERING
7.1 Assembly, Reflow & Soldering steps
The A side (TOP side) of a double sided PCB is mainly laid out (designed) with large IC's components.
The B side (Bottom) of a dual sided PCB is mainly laid out (designed) with small chips.
7.2 Step 1
We start with Screen printing the
B
side of the double side PCB with smallest components.
Placing the components
Reflowing PCB Side B with the components
7.3 STEP 2
Board side
A.
After populating and reflowing the
B
side with the smallest components, repeat the process on the
A
side with the
larger SMT parts.
This sequence will keep the largest and heavier parts from hanging upside down during reflow, reducing the
possibility that they would fall off.
Molten solder has very high surface energy and can hold most SMT parts even upside down.
