PCB Design & Manufacturing Reference
Educational guidance for layout, fabrication data and design-for-manufacture. Always use your fabricator's current capability data and released standards.
1. PCB design workflow
Start from electrical requirements, schematic and netlist. Define the mechanical envelope and stack-up, place critical components, establish power/ground strategy, route controlled nets, complete general routing, then run electrical and manufacturing checks before release.
2. Board stack-up
A PCB stack-up defines copper layers, dielectric materials, thicknesses and reference planes. Impedance depends on trace geometry and dielectric construction, so controlled-impedance designs must use the fabricator's agreed stack-up rather than nominal values alone.
3. Track width & spacing
Track width affects current capacity, resistance, impedance and manufacturability. Clearance controls electrical isolation and fabrication yield. Minimum values should come from the applicable design rules, voltage requirements and supplier capability.
4. Pads, vias & annular rings
Through-hole features contain a drill and surrounding copper land. The annular ring must remain after drill and layer registration tolerances. Via aspect ratio, finished hole size and plating capability become increasingly important as boards get thicker or holes smaller.
5. Solder mask
Solder mask openings expose copper for soldering. Check mask expansion, minimum mask dams/slivers and registration. Mask-defined and copper-defined pads behave differently and should be intentional.
6. Silkscreen
Silkscreen should provide readable references and polarity/orientation marks without printing over exposed pads or critical test surfaces. Keep line width and text height within your supplier's process capability.
7. Gerber data
Gerber RS-274X describes 2D manufacturing artwork. Separate files commonly represent copper, mask, paste, silkscreen and profile data. Excellon files usually carry drill coordinates. Gerber is manufacturing geometry, not a complete intelligent design database.
8. Design rule checks
DRC should check minimum conductor width/spacing, copper-to-edge, annular ring, drill sizes, unconnected nets and layer-specific constraints. A clean DRC does not by itself prove manufacturability; supplier capability review is still required.
9. Release package
A controlled manufacturing release should identify revision, Gerber files, drill files, fabrication drawing, stack-up, material requirements, finish, controlled-impedance information, tolerances and any special notes. Release data must remain configuration controlled.
10. Quality perspective
Verify that the generated fabrication package matches the released design. Compare layer count, profile, drill data, revision and critical features. For high-reliability products, consider independent CAM review, netlist comparison and supplier DFM feedback before production.