Burn-In Testing

Burn-in testing is a reliability screening process in which an electrical or electronic component is exposed to controlled operating conditions or environmental stresses for a specified period. The goal is to identify parts that may fail early because of manufacturing defects or other weaknesses that are not apparent during an initial inspection. These early failures are sometimes referred to as “infant mortality” failures.

A burn-in procedure may expose a component to elevated temperatures, an electrical load or other stresses. The exact duration and conditions depend on the type of component and the requirements of the testing program. Stress levels must be selected carefully so the test can reveal potential weaknesses without unnecessarily damaging an otherwise acceptable component.

For magnetic components, factors such as current, heat, insulation and operating duty cycle can affect how a coil or assembly behaves over time. When burn-in testing is specified for these parts, the procedure must account for their electrical and thermal ratings. Burn-in testing is different from a basic continuity or resistance check, which only measures particular characteristics at the time of inspection.

Burn-in testing is particularly valuable in applications where an early component failure could lead to expensive repairs, equipment downtime or other operational problems. However, passing a burn-in test does not guarantee that a component will never fail. It is one possible part of a broader quality and reliability program rather than a replacement for proper design, qualification or other required testing.