Why tombstoning still matters in modern SMT production
The tombstone effect is one of those classic reflow defects that still catches teams by surprise. Small 2-pin SMT parts such as resistors and capacitors can partially or fully lift from one pad during soldering, creating scrap, rework, and avoidable process loss.
In many cases, the root cause is not the component itself but an imbalance in pad connection. If one side is thermally or geometrically different from the other, the two pads heat and cool at different rates. That asymmetry creates mechanical stress, and the part can rise on one side like a tombstone.
How PCB-Investigator helps identify the risk
PCB-Investigator’s Tombstone Analysis inspects small 2-pin components and compares the connection difference between both pins. The larger the difference, the higher the likelihood of uneven heat expansion and cooling behavior during reflow.
Engineers can refine the analysis with practical filters such as component dimensions, property-based selection, minimum connection difference thresholds, and whether a via in pad should count with its circumference. The result list highlights violations with the relevant component reference and key details, making review faster and more targeted.
Detecting tombstone risk early is far cheaper than debugging it on the production line.
What this means for layout and manufacturing teams
- Identify high-risk 2-pin SMT parts before reflow
- Focus design review on real defect drivers
- Mark critical findings for later use in reports
- Store and reload the latest analysis result
- Reuse results in the Extended Design Report
If the calculation becomes too complex, PCB-Investigator flags it clearly and uses a graphical estimation instead. That keeps the analysis practical while still pointing reviewers to cases that deserve attention.
If you want to reduce tombstoning risk in your PCB workflow, explore the analysis and see how it fits into your design and production checks.
