Find a replacement for any part
Search across 1,203,810+ substitution pairs covering 7,283,818 components. Drop-in replacements, functional equivalents, and legacy cross-references — all in one search.
Drop-in Replacements
Same specifications, same package footprint, different manufacturer. These parts are interchangeable in most applications without design changes.
Functional Equivalents
Same part family, different package variant. An LM358 in SOIC-8 versus DIP-8 — identical electrically, but verify physical fit and thermal requirements.
Legacy Cross-References
Historical ECG and NTE semiconductor replacement mappings from the 1980s–1990s master guides. Invaluable for repairing vintage equipment and finding modern equivalents to discontinued parts.
When the part you need doesn't exist anymore
Electronic component obsolescence is accelerating. The average lifecycle of a semiconductor has dropped from 15 years to under 5. Manufacturers discontinue parts with little notice, leaving engineers scrambling for alternatives that won't require a full board redesign.
Even when parts aren't obsolete, supply chain disruptions, allocation, and extended lead times can make your specified component unavailable for months. A qualified substitute keeps your production line running while you wait — or replaces the original permanently at a lower cost.
Our substitution database is built from multiple sources: parametric matching across 7+ million components, the ECG Semiconductor Master Replacement Guide (covering 200,000+ historical crosses), NTE cross-reference data, and KiCad EDA symbol mappings. The result is the most comprehensive free substitution tool available online.
End of Life (EOL)
Your manufacturer issued a Product Discontinuation Notice. No last-time-buy stock remains. You need a form-fit-function replacement that drops into the same PCB footprint.
Component Shortage
Your primary part is on 52-week allocation. A qualified alternative from a different manufacturer is in stock today. We validate electrical and mechanical compatibility so you can make the swap with confidence.
Cost Reduction
The original part works fine, but a compatible component from another manufacturer costs 40% less at volume. We identify these opportunities and qualify the substitution.
Second Source Strategy
Relying on a single manufacturer is a supply chain risk. We identify qualified second sources for your critical components so you're never dependent on one supplier.
Vintage Equipment Repair
The original part was manufactured in 1985 and hasn't been available for decades. Our ECG and NTE cross-reference data maps legacy part numbers to modern equivalents.
Transparent, programmatic matching
How we match
Our substitution engine compares parts across key parameters: resistance, capacitance, voltage ratings, current ratings, tolerance, package dimensions, and temperature range. Parts with identical specs in the same package from different manufacturers are flagged as drop-in replacements. Parts in the same family but different packages are flagged as functional equivalents with a lower confidence score.
When to talk to us
Programmatic matching works well for passive components and standard semiconductors. For complex ICs, power modules, RF components, and safety-critical applications, our engineering team provides hands-on substitution analysis. We verify pin compatibility, review timing parameters, and test the replacement in your specific application context.
Substitution data is generated programmatically and provided for reference purposes. While we strive for accuracy, always verify compatibility for your specific application before committing to a substitute. Arrow Lakes provides no warranty on programmatic matches — contact our engineering team for qualified substitution analysis.
Can't find a match? We can.
Our engineering team handles the substitutions that algorithms can't — complex ICs, custom specifications, and safety-critical applications.