PCB Design

10 PCB Layout Mistakes That Kill Your First Prototype

The most common PCB design errors that cause boards to fail — and how to avoid each one.

March 6, 2025·6 min read
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The 10 Mistakes

  • 1. Missing decoupling caps — 100nF ceramic on every IC VCC pin
  • 2. Wrong footprint — always verify with physical part before ordering
  • 3. Thin power traces — use 1mm per amp minimum
  • 4. No ground plane — use copper pour for return paths and noise reduction
  • 5. Decoupling caps too far from IC — must be adjacent to power pin
  • 6. Floating inputs — tie unused inputs to VCC or GND via 10kΩ
  • 7. No test points — add 1mm pads on all important signals
  • 8. Silkscreen over pads — keep silkscreen 0.1mm away from all pads
  • 9. Incorrect connector pinout — verify mating direction with physical connector
  • 10. No mechanical check — verify board fits enclosure in 3D view

💡 Tip: Run DRC, do a 3D mechanical check, and have someone else review — in that order — before sending to fab.

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