PCBA Reliability: Conformal Coating & Field Survival
1 resources tagged with "Reliability"
Reliability is about whether a board survives its real operating environment — humidity, condensation, vibration, salt fog — not just whether it passes at the factory bench. For China-built PCBAs headed into outdoor, automotive, or industrial use, conformal coating (acrylic, urethane, silicone, or parylene) is the most common protective step, inspected against IPC-CC-830B for coverage and thickness.
When you spec reliability, name the coating type, the keep-out areas around connectors, and the inspection standard up front — factories often skip masking or apply uneven coats to save time. The common pitfall is treating a passing functional test as proof of reliability; you also need the right coating, correct thickness (typically 25–75µm for acrylic), and ideally a humidity or thermal-cycle screen on samples.
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FAQ
What conformal coating should I choose for my product?
Acrylic is cheap and easy to rework; urethane resists chemicals; silicone handles high temperature and flex; parylene gives the thinnest, most uniform barrier but costs more. Choose based on the environment, then specify it on the drawing.
How do I verify reliability before mass production?
Run sample units through environmental screens like temperature cycling, humidity, and vibration, and inspect coating against IPC-CC-830B. A small qualification batch is far cheaper than field returns.
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