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Our free PCB DFM check combines automated Gerber analysis with senior engineer review. We verify trace spacing, via clearance, solder mask, impedance, copper balance, panelization — and flag manufacturing risks that rule-based tools alone cannot detect.
Common PCB DFM Issues We Catch Before Production
Real before-and-after DFM cases: via spacing violations, impedance mismatches, solder mask errors, panelization problems, and copper balance issues — with dollar impact for each.
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2024-11-08
Eng: L. Zhang, PE
| PROJECT INFO | |
|---|---|
| Customer | Confidential — NDA Protected |
| Size | 92×68mm, 1.6mm |
| Layers | 6L HDI 1+4+1 |
| Material | FR-4 Tg170 |
| Impedance | 50Ω SE / 90Ω Diff |
| Finish | ENIG |
12 issues across 6 categories. 3 critical items require correction before production release.
| # | Category | Issue | Severity |
|---|---|---|---|
| 1 | Via | Via-to-via 0.10mm on U1 BGA fanout (min 0.15mm) | CRITICAL |
| 2 | Trace | USB_DP/DN diff pair Z=72Ω (spec: 90Ω±15%) | CRITICAL |
| 3 | Mask | QFP-64 U5 mask encroachment -0.03mm on 28 pins | CRITICAL |
| 4 | Copper | L2 GND split 2.4mm under 25MHz CLK trace | CRITICAL |
| 5 | Trace | Trace-to-edge 0.12mm on net VCC_3V3 (min 0.25mm) | WARN |
| 6 | Panel | Panel missing global fiducials and tooling holes | WARN |
| 7 | Stack | L2/L5 copper balance 38%/62% (target <20% delta) | WARN |
| 8 | Silk | Silkscreen overlaps pads on C12, R47, U3-pin1 | WARN |
| 9 | Via | 12× GND vias direct-connect to L2 plane (no thermal) | WARN |
| 10 | DFA | U7 (QFN-32) placement 0.8mm from routed edge | NOTE |
| 11 | Panel | Panel array 2×3 on 18×24", 65% utilization | NOTE |
| 12 | Mask | Test points TP3-TP8 mask opening Ø0.6mm (min Ø0.9mm) | NOTE |
BGA U1 (0.5mm pitch, 256-ball) fanout area: 3 via pairs measured at 0.10mm edge-to-edge spacing. Process minimum for Ø0.1mm laser-drilled microvias is 0.15mm per manufacturer capability sheet. Risk: drill wander causes annular ring overlap → copper bridge → inter-net short.
❌ Current
✅ Fix
| If Not Fixed | After Fix |
|---|---|
| 25-30% yield loss at via plating, est. $1,800 scrap per 500-pc lot | Standard yield >98.5%, no additional tooling cost |
USB 3.0 diff pairs spacing 0.08-0.18mm, impedance ±22% out of spec...
❌
✅
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QFN-48 center pad requires segmented mask...
❌
✅
2.8mm split under clock net...
| # | Issue | Fix |
|---|---|---|
| 5 | Edge clearance | → 0.25mm |
| 6 | Fiducials | Add 3+2 |
| 7 | Cu balance | Thieving |
Rotate 90° for 2×4 array, 72→86%...
U7 0.8mm from edge...
1. Fix 4 critical
2. Apply 5 warnings
3. Free re-check
4. Approve panel
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PCB Manufacturing Capabilities Behind Our DFM Standards
Our DFM review rules come from 15 years of real production experience — HDI, multilayer, flex, RF, and heavy copper.
HDI & Microvia
1-4 order, 3/3mil, 0.1mm laser via.
Multilayer up to 60L
Hybrid stackup, backdrill, impedance ±5%.
Flex & Rigid-Flex
FPC, complex fold structures.
High-Freq RF
Rogers, Taconic. ±5%. 5G, radar.
Heavy Copper
6oz, metal core. Power, LED, EV.
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