Component sourcing in 2026: avoiding counterfeit and end-of-life parts

By the Shara Circuits engineering team

Two sourcing problems quietly kill more hardware products than any design flaw: counterfeit components that pass a visual check but fail in the field, and end-of-life notices that arrive after you've built your product around a part. Both are avoidable with a few disciplined habits.

The counterfeit problem is a channel problem

Counterfeits enter the supply chain almost exclusively through unauthorised channels — brokers, marketplace sellers and "too good to be true" stock during shortages. The defence is boring but effective:

• Buy from authorised distributors first. Authorised channels carry manufacturer traceability. Independent brokers have their place for EOL parts, but treat every broker purchase as untrusted until verified.
• Be most suspicious when a part is scarce. Counterfeiters follow shortages. If a part is on 26-week allocation everywhere and one seller has 5,000 units ready to ship, that stock is exactly as real as it sounds.
• Insist on full traceability paperwork for any part bought outside authorised channels — date codes, lot codes, certificates of conformance — and inspect incoming batches (marking quality, package dimensions, and a sample electrical test) before they reach the line.
• Watch the price signal. A genuine part selling far below distributor pricing isn't a bargain; it's a warning.

End-of-life: manage it before it manages you

• Check lifecycle status at design time. Every major manufacturer publishes lifecycle stages. A part marked NRND ("not recommended for new designs") is telling you, politely, not to design it in.
• Prefer parts with multiple sources. Jellybean passives are interchangeable; the risk lives in single-source ICs. For every critical single-source part, document an approved alternative — or accept, in writing, that a redesign may be forced someday.
• Subscribe to PCN/EOL notices for your critical parts. Manufacturers typically offer a last-time-buy window — but only teams who see the notice can act on it.
• Review your BOM's lifecycle annually. A product that ships for five years will outlive some of its components. A yearly one-hour review beats an emergency redesign.

What a good sourcing partner does for you

A sourcing partner earns its margin by absorbing exactly this work: buying through authorised channels, flagging lifecycle risks in your BOM before purchase, proposing cheaper or better-stocked alternatives, and standing behind the authenticity of what lands on your boards. If your current supplier can't tell you where a part came from, that's your answer.