Replacing obsolete components without risking the board
One discontinued chip can stop the production of an entire assembly. Finding a replacement is part engineering, part purchasing – and the cheapest offer on the broker market is rarely the safest.
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Step by step to a replacement
- Identify the part exactly: manufacturer, full part number including suffix, package, temperature range.
- Check the life-cycle status and remaining stock at authorised distributors.
- Search for direct replacements from the same or another manufacturer – same pinout, package and electrical data.
- If none exists, look for functional equivalents and assess the necessary board changes.
- Document the decision and the differences, and test the first boards with the new part.
Levels of compatibility
| Type | Meaning | Board change |
|---|---|---|
| Drop-in | Same pinout, package and specifications | None |
| Pin-compatible | Same footprint, slightly different specifications | None, but verification needed |
| Form-fit-function | Different part, same mechanical and functional behaviour at board level | Small, e.g. adapter or footprint change |
| Functional equivalent | Same function, different package or interface | Layout change, possibly redesign |
The broker market and counterfeit risk
When authorised channels are empty, independent distributors and brokers often still have stock. Prices can be high, and the risk of counterfeit or remarked parts is real – especially for semiconductors that have been obsolete for years.
- Buy from authorised distributors or authorised aftermarket manufacturers first.
- For independent distributors, require traceability and inspection according to standards such as SAE AS6081 or AS5553, which are common in aerospace.
- Have samples inspected (visual, X-ray, electrical) before using a batch.
- Never mix batches of unclear origin in safety-relevant equipment.
When a redesign beats the search
If several parts on the same board are obsolete, or if you would have to buy from brokers repeatedly, a targeted redesign is usually cheaper over the life of the equipment. The board keeps its outline and connectors, but uses components with a long availability outlook.
Questions
Can you check my whole BOM for obsolete parts?
Yes. In the assessment we check the life-cycle status of the parts, mark the critical ones and propose alternatives.
Do you buy the components for us?
On request we source components through partners as part of a manufacturing order. For critical parts we use authorised channels.