3. Cleaning, depanelization, press-fit, coating & potting
A PCBA may appear electrically and metallurgically flawless post-soldering, but remains vulnerable without rigorous downstream mechanical and chemical process control. Improper depanelization fractures components, while environmental exposure degrades unprotected assemblies.
This chapter details engineering parameters required to finalize the PCBA. Guidelines for stress-free depanelization, mechanical tolerances for press-fit interconnects, and chemical application principles for
- 3.1 Clean vs. no-clean decisions
The chemical residues remaining on a printed circuit board assembly (PCBA) post-soldering impact the long-term reliability and operational lifespan of the product. The decision between implementing a...
- 3.2 Cleaning methods & fixtures
Effective PCBA cleaning requires targeted methodologies beyond simple solvent exposure. Because assembly residues are microscopic, the chosen cleaning methodology dictates long-term reliability and pr...
- 3.3 Depanelization methods
Depanelization is the final mechanical process that separates individual Printed Circuit Boards (PCBs) from their larger manufacturing array (the panel). Choosing the right separation method is a crit...
- 3.4 Press-fit technology
Press-fit is a mechanical interconnection technology that forces a specialized, compliant pin into a plated through-hole (PTH), deforming the copper to create a permanent, gas-tight electrical connect...
- 3.5 Coating & encapsulation: potting
Environmental factors are the primary cause of field failures for electronic assemblies. A reliable Printed Circuit Board Assembly (PCBA) degrades rapidly when exposed to prolonged condensation, salt...