Engineering Cases
Engineering Cases focuses on real PCB engineering reviews, manufacturing challenges, and production optimization processes from actual fabrication projects. This category highlights how different PCB designs are evaluated and adjusted during engineering review, covering topics such as stack-up analysis, impedance control, drill optimization, copper balancing, solder mask alignment, DFM review, and production risk assessment across various PCB applications. The content in this section is based on practical manufacturing scenarios rather than theoretical introductions. Each engineering case demonstrates how specific PCB issues are identified, analyzed, and resolved during production preparation and fabrication. These records help engineers, purchasers, and hardware teams better understand the relationship between PCB design decisions and manufacturing stability, yield control, and process reliability. Topics may include multilayer PCB engineering review, HDI process optimization, flexible PCB manufacturing considerations, heavy copper processing adjustments, surface finish selection, Gerber data verification, and other real-world PCB production experiences. By organizing engineering challenges and process solutions into structured case content, this category provides valuable insight into practical PCB manufacturing and engineering workflow management.
Featured Blog
PCB Hole Attributes and Special Drilling: Common CAM Review Conflicts
See how CAM reads PCB hole attributes and special drilling—PTH vs NPTH, back drill, press-fit holes, countersink, and laser vias—and why incomplete data delays fabrication.
Latest Blogs
How We Fixed Impedance Line Conflicts on 10-Layer PCB
CAM review of a 10-layer impedance-controlled board found differential spacing mismatches and traces on non-existent layers. Stackup was adjusted for available materials and line geometry corrected to meet targets before production.
How DFM Prevented Back Drill Dimples in 12-Layer PCB
Learn how DFM review resolved back drill dimples, PTH/NPTH hole mismatches, and missing impedance traces on a 12-layer FR4 PCB, preventing assembly defects, open circuits, and signal integrity risks before production.
Why 0.267 mm Stamp-Hole Spacing Failed on Rogers RO4350B PTH Boards
Original 0.267mm stamp hole spacing on Rogers RO4350B with PTH holes risked board breakage. See how reducing diameter to 0.5mm and spacing to 0.4mm restored process capability for reliable depanel
How CAM Review Fixed Stackup, Via Tenting & Outgassing Conflicts on a 7-Layer Rigid-Flex PCB
Real CAM engineering review of a 7-layer rigid-flex PCB. Learn how stackup substitution, via tenting conflicts, PI stiffener gaps and solder mask outgassing risks were resolved to avoid delamination, yield loss and production delays.
How a 0.1 mm Stackup Mismatch and Material Shortage Halted a 6-Layer 3 oz PCB Order
Discover key DFM lessons on 6-layer PCB stackups. Learn how to handle 3 oz heavy copper thickness errors and TG170 to NP-175FTL material substitutions in CAM.
How DFM Prevented Via Tenting Issues in 4-Layer FR4 PCB
Learn how DFM review resolved via tenting mismatches, stackup conflicts, and undersized silkscreen in a 4-layer FR4 PCB, preventing yield loss, solder wicking, warpage, and reliability risks before production.
Can 0.1mm PI Stiffener Achieve 0.3mm FPC Total Thickness?
See how a 0.1 mm PI stiffener could not reach the requested 0.30 mm total thickness on a long single-layer FPC—and the zone-specific tolerances plus hard-gold lead fix that kept the process stable.
Preventing Exposed Copper from Copper to Outline Clearance Issues
Learn how DFM review fixed tight copper to outline clearance on a 6-layer FR4 PCB to prevent exposed copper after routing. Key steps: 8 mil copper shave, process edge tooling marks, and original solder mask openings for better yield and reliability.
1-Layer PCB DFM Guide: Handling Empty Layers & Slot Clearance
Avoid CAM review holds on single-sided PCBs. Learn how to handle empty Gerber layers, slot clearance issues, and missing drawing text during PCB CAM review.
How DFM Prevented Heavy Copper Etch Failures in Multilayer PCB
This case applies Heavy Copper PCB Design Rules to show how DFM review fixed tight clearances with pad shaving, limited resin fill to 0.3 mm vias, and approved stackup substitution, preventing residual copper bridges, via voids, and material lead-time delays.
How We Resolved Serial ID Marking on 4-Layer ENIG PCB
CAM review of a small 4-layer ENIG board found no silkscreen layer and insufficient solder-mask space for required sequential IDs and UL marks. Marks were relocated to clear top-side areas to meet IPC-4552 without reducing clearance.
How DFM Handled Undersized Silkscreen on Dense 6L PCB
This case shows how DFM review handled Silkscreen Minimum Size limits on a dense 6-layer FR-4 board where characters fell below 0.1 mm width and 0.7 mm height, confirming possible blur and fixing paste-to-mask opening mismatches for reliable production.
