Why a Small Component Change Can Create a Big Certification Risk

A component substitution may seem simple, but it can affect safety, EMC, documentation, and testing scope. Learn how teams can evaluate certification impact before approving changes.

A hardware team needed to replace a component because of supplier availability. On the surface, the change looked minor.

The form, fit, and function were similar. The device performance did not appear to change. The engineering team expected the update to be low risk.

But the compliance review showed otherwise.

As one project manager explained: “We thought this was just a supplier substitution. We did not realize it could affect our certification file.”

The issue

The replacement component introduced new questions around safety, EMC, and documentation.

The team needed to determine whether the change affected:

• Electrical safety requirements
• Leakage current or insulation considerations
• EMC performance
• Approved component ratings
• Technical file documentation
• The need for additional testing

The risk was not that the new component was automatically unacceptable. The risk was that the certification impact had not been evaluated before approving the change.

How the issue was fixed

The team followed a structured certification impact review.

The process included:

1. Comparing the original and replacement component specifications
2. Reviewing safety ratings, approvals, and datasheets
3. Checking whether the change affected critical circuits
4. Evaluating EMC and thermal impact
5. Determining whether partial testing was needed
6. Updating the technical documentation and risk file

This allowed the team to separate low-risk items from areas that needed additional evidence.

The result

Instead of waiting for a lab or certification body to identify the concern later, the team created a clear compliance justification for the change.

The project avoided unnecessary confusion and reduced the chance of a certification delay.

Key lesson

Small design changes can create large certification questions.

A component update, supplier substitution, firmware change, or layout adjustment may seem simple from an engineering perspective, but compliance impact needs to be reviewed before the change is approved.

At CertPath, we help teams understand how design changes affect certification so they can move faster with more confidence.