PCB Traceability Selection: Choosing What Fits Buyers and engineers often focus on the finished product and forget the production line behind it. In practice, most field failures can be traced back to process decisions made during assembly. Understanding PCB traceability selection gives you a practical advantage when you choose a…

Panel Utilization: Preparation, Placement and Process Control Printed circuit boards are made on panels and sold as boards, and the difference between the two is where a significant part of the cost lives. Panel utilization is the fraction of the panel that becomes product, and improving it lowers the price…

Thermal Shock Versus Thermal Cycling Tests Thermal shock and thermal cycling both expose a board to a temperature change, and they produce different failures because the rate of change is different. A test that is chosen for the wrong reason qualifies the wrong property. What Separates the Two A thermal…

Solder Joint Grain Structure and Reliability Guide A solder joint is a metal casting on a very small scale, and like any casting it has a grain structure that depends on how it solidified. The grain structure in turn decides how the joint behaves under thermal cycling, how it cracks…

PCB Traceability Control: Holding It Steady Electronics manufacturing has become a discipline of small details. Solder paste volumes, placement accuracy, temperature profiles and inspection limits all add up to the final result. This guide looks at PCB traceability control from the perspective of a PCBA factory floor, covering controlling traceability…

PCB Traceability Traceability: Following One Board Buyers and engineers often focus on the finished product and forget the production line behind it. In practice, most field failures can be traced back to process decisions made during assembly. Understanding PCB traceability traceability gives you a practical advantage when you choose a…

PCB Traceability Standards: Agreeing the Rules Electronics manufacturing has become a discipline of small details. Solder paste volumes, placement accuracy, temperature profiles and inspection limits all add up to the final result. This guide looks at PCB traceability standards from the perspective of a PCBA factory floor, covering applying standards…

Solder Mask Registration on Fine Pitch Pads Solder mask registration is the alignment of the mask openings to the pads, and on a fine pitch design it is the item that decides whether a printable dam exists between two pads. The dam is what holds the paste in place during…

Stencil Cleaning and Solder Paste Residue Control Guide A stencil that is not clean will not print consistently, and the reason is simple: the paste left in the apertures from the previous print changes the volume that the next print can deliver. Stencil cleaning is therefore a process control rather…

Approved Component Substitution Process A component shortage forces a decision: wait, or use a part that is not the one on the drawing. The second option is legitimate and it has to be managed, because an unmanaged substitution is a design change made by whoever was at the desk when…