How to Choose Semiconductors for a Product Expected to Last 15 Years

 Designing an electronic product for a 12- to 15-year life changes the meaning of “best component.” Peak performance and the lowest unit price still matter, but they compete with product longevity, software continuity, manufacturing stability, qualification, traceability, and the cost of future redesign.

This is common in industrial controls, building automation, energy systems, transportation, laboratory instruments, and repairable equipment. The product may stay in production for years and remain in the field even longer. A semiconductor selected today may need to support manufacturing, warranty, service stock, and regulatory records well into the next decade.

No supplier can remove all uncertainty from that horizon. A good design process makes the uncertainty visible and creates options before they are urgently needed.

Define the Required Support Window

“Fifteen-year product” can mean several things. Convert it into dates and quantities.

For example:

• design and qualification: 18 months;

• active production: 8 years;

• warranty support: 3 years after the last shipment;

• field repair: 5 additional years;

• annual and lifetime unit forecasts;

• expected demand decline by year.

The semiconductor does not necessarily need continuous production for the entire period if the business can fund a last-time buy and store the parts correctly. But that strategy adds inventory cost, forecast risk, shelf-life controls, and the danger that another component fails first.

The best plan combines suitable suppliers with realistic inventory and migration options.

Use Lifecycle Evidence, Not a General Impression

A manufacturer known for industrial products may still discontinue an exact device. A recently launched component may have a long future, but “new” is not the same as “committed.” A legacy component may remain available for years, but it can also depend on aging tools, materials, or fabrication processes.

Check the exact manufacturer part number for:

• current product status;

• inclusion in a formal longevity program;

• published program end date or duration;

• product-change and discontinuance history;

• last-time-buy and final-delivery terms;

• recommended migration devices;

• availability of development tools and software archives.

Manufacturer policies offer useful evidence when read carefully. Microchip describes a client-driven obsolescence practice under which products with continuing business activity may remain available, subject to manufacturability. Texas Instruments says its product life cycles are typically 10 to 15 years and often extend longer, while explaining the conditions in its internal longevity guidelines.

These statements are not interchangeable guarantees. Apply them to the exact MPN and note any conditions.

Prefer Components With a Manageable Exit

Long-life design is partly the art of choosing what can be changed later.

A small resistor may have many qualified alternatives. A microcontroller can lock in firmware, tools, peripheral behavior, safety libraries, and PCB connections. An FPGA can add tool licensing, IP cores, timing closure, and power sequencing. A wireless SoC can bring RF certification and antenna dependencies. A power module can lock in mechanical and thermal architecture.

Before approval, estimate the impact of replacing the part:

Change area	Questions to answer now
Electrical	Are voltage, timing, noise, drive, and transient limits likely to be portable?
PCB	Is there a pin-compatible option, reserved footprint, adapter strategy, or space for rerouting?
Firmware	Is the code portable, and are hardware abstraction layers controlled internally?
Tools	Can compiler, programmer, debug, and configuration versions be archived and reproduced?
Compliance	Would a substitution trigger EMC, safety, RF, automotive, or customer reapproval?
Production	Would test fixtures, programming, calibration, or work instructions change?

The goal is not to predict the exact replacement. It is to reduce the number of expensive assumptions embedded in the original design.

Separate Company Strength From Part Suitability

Large chip companies can offer broad resources, manufacturing investment, and mature support systems. Specialist suppliers can offer focused products, longer legacy support, or features unavailable elsewhere.

Neither size nor fame proves long-term suitability.

A revenue ranking is dominated by large markets such as AI compute, processors, mobile devices, and memory. An industrial BOM may depend instead on analog ICs, microcontrollers, interface devices, isolation, power semiconductors, sensors, and nonvolatile memory. The relevant supplier set changes with the component category.

Octatronics' guide to evaluating semiconductor companies and manufacturers is a useful companion when building that category-level shortlist because it separates business roles from actual procurement criteria.

Investigate Manufacturing and Change Control

Company headquarters tells you little about the path of one component. A device may involve wafer fabrication, assembly, and test in different countries and by different organizations.

Ask whether multiple sites are qualified for critical steps, how site transfers are controlled, and which changes generate a PCN. You may not receive confidential details, but the supplier should be able to explain its change-notification and qualification framework.

Assign responsibility inside your organization as well. PCNs and PDNs often fail because they reach an old email address or a purchasing inbox with no engineering workflow. A long-life program should define:

1. who subscribes to notices;

2. who evaluates technical impact;

3. when samples and requalification are required;

4. how customers are informed;

5. who approves a last-time buy;

6. where records are stored for future service teams.

Design a Supply Route for Each Phase

The appropriate sourcing route can change over the product life.

During development, manufacturer samples and authorized distributors make it easier to obtain current documentation and small quantities. During predictable production, direct or authorized supply can support scheduled deliveries and change communication. In late life, shortages or obsolete devices may require qualified independent sourcing, but authenticity and condition risk rises.

Define the late-life policy before the first shortage. It should state:

• when independent sourcing is permitted;

• required supplier approval;

• traceability and photo requirements;

• incoming inspection and testing;

• rules for date codes and packaging condition;

• storage and moisture controls;

• escalation for safety-critical uses.

The policy should be proportional. The controls for a noncritical lab accessory will differ from those for a safety function or regulated product.

Qualify Alternatives Before They Are Urgent

An alternate does not have to be drop-in to be useful. Classify alternatives by the work they require:

• true approved second source: interchangeable within documented limits;

• pin-compatible alternate: same footprint, but electrical and firmware review required;

• functional alternate: same job with PCB, software, or validation changes;

• platform migration: planned move to a newer family or architecture;

• lifetime inventory: no practical alternate, so stock is purchased for remaining demand.

Test the most credible path while the original component is still available. A prototype migration completed during normal engineering time is far cheaper than a redesign launched after the production line stops.

Preserve the Ability to Rebuild

Long-life support depends on more than component stock. Archive the complete environment needed to manufacture and diagnose the product:

• released schematics, PCB files, and BOM revisions;

• datasheets and errata used for approval;

• compiler, IDE, programmer, FPGA, and configuration-tool versions;

• source code, build instructions, libraries, and licenses;

• calibration and production-test software;

• golden samples and known-good programming files;

• qualification reports, PCNs, deviations, and supplier records.

A warehouse full of MCUs is not useful if the only computer that can build the firmware disappears.

Review the BOM as a Portfolio of Risks

Not every line deserves the same effort. Score components by the consequences and difficulty of replacement.

High-priority items usually combine several characteristics:

• custom firmware or configuration;

• single-source package or pinout;

• safety or regulatory relevance;

• long qualification time;

• high tooling or certification cost;

• weak lifecycle evidence;

• concentrated manufacturing;

• declining or volatile demand;

• limited visibility into the supply route.

Review those parts at least annually and whenever a major PCN, PDN, acquisition, process transfer, or demand change occurs. Lower-risk catalog items can be managed with lighter controls.

A Long-Life Selection Checklist

Before releasing the design, confirm that:

• the exact MPN meets all guaranteed technical limits;

• the required support window is written in dates;

• lifecycle evidence has been collected at MPN level;

• PCN and PDN recipients and workflows are active;

• manufacturing concentration has been assessed as far as practical;

• the approved supply routes are documented;

• switching cost has been estimated;

• at least one alternate or migration strategy is classified;

• tools, source, test assets, and records can be reproduced;

• the highest-risk BOM lines have named owners and review dates.

The most reliable 15-year design is not the one that assumes its original BOM will never change. It is the one that can absorb change without losing technical control, traceability, or production continuity.