2 . Manufacturing Specifications PCB + PCBA Process

Quality must be engineered into the tolerances. Physical attributes of a PCB often dictate the constraints of the entire assembly process.

Manufacturing Specifications define essential boundaries for material properties, trace widths, and solder mask requirements. Undefined parameters allow arbitrary supplier choices, introducing unpredictable variability into the build.

2.1 Material Science, Stackups and Via Architecture
A printed circuit board defined solely by Gerber files is an incomplete specification. Without an explicitly documented material and stackup definition, fabrication houses may default to the lowest-co...
2.2 Surface Finishes and Panelization Strategy
The physical and electrical interface between the component and the PCB is dictated by two critical factors: the planar topology of the surface finish and the mechanical rigidity of the panelized arra...
2.3 Land Patterns, Spacing and Polarity
A component footprint is not merely a drawing; it is a prediction of how molten solder will behave under the physical forces of surface tension. Relying strictly on component manufacturer datasheets f...
2.4 Process Specs: Alloys, Stencils and Chemistry
Soldering is not just the act of applying conductive glue; it is a complex metallurgical process based on phase changes, fluid dynamics, and surface tension. If the baseline chemistry is not properly...
2.5 Workmanship and Acceptance Criteria
Quality cannot be negotiated _after_ the solder has cooled. Subjective terms like "good enough" or "looks neat" are insufficient and can lead to disputes between the EMS and the client. To guarantee a...