IC obsolescence is no longer an occasional supply-chain issue; it has become a fundamental system-architecture constraint for long-lifecycle electronic products.
In industrial, aerospace, defence, automotive, transport and medical platforms, deployed system lifetimes increasingly extend beyond 15–30 years, while the commercial lifetime of many semiconductor components has reduced to less than seven years. This growing mismatch between semiconductor market dynamics and deployed system lifecycles is driving a structural increase in redesign cost, qualification burden and long-term supply risk.
Rather than repeatedly reacting to discontinuation notices, many system manufacturers are now evaluating custom ASICs as a strategic method of stabilising critical electronic functions, either in response to an immediate end-of-life (EOL) event or during the architecture phase of a new platform intended for long-term deployment.
Why IC obsolescence is becoming harder to manage
Semiconductor vendors continue to optimise product portfolios around high-volume consumer, mobile and communications markets, accelerating process migrations and rationalising mature product families. As a result, component obsolescence rates continue to rise sharply.
Recent lifecycle analyses indicate that hundreds of thousands of electronic components now reach end-of-life every year. In 2023, close to 474,000 parts became obsolete globally, while 2025 recorded more than 620,000 EOL events. More concerning for long-life system manufacturers is the growing proportion of silent obsolescence events, where products disappear from distribution channels with limited or no formal product change notification (PCN), significantly reducing mitigation time.
Common technical and commercial drivers include:
- migration to finer process geometries,
- declining demand for legacy analogue and mixed-signal technologies,
- wafer fab rationalisation,
- packaging discontinuations,
- substrate and test capability changes,
- and semiconductor industry consolidation following acquisitions.
At the same time, system design lifetimes in industrial, transport and safety-related sectors continue to increase. This mismatch between semiconductor lifecycles and system support requirements sits at the heart of the challenge.
A board can be redesigned once or twice around new components, but every unplanned redesign consumes engineering resources, introduces fresh qualification requirements and increases supply-chain and operational risk. In safety-critical systems, even relatively small component substitutions can trigger expensive validation and regulatory approval activities.
Relying exclusively on catalogue semiconductor devices also exposes manufacturers to decisions outside their control, including vendor portfolio changes, process shrinks, packaging migrations and unpredictable EOL announcements that may not align with long-term customer commitments.
The limits of last-time buys and drop-in replacements
When a critical IC approaches obsolescence, two familiar mitigation strategies typically dominate: executing a last-time buy or identifying a compatible replacement component.
A last-time buy can temporarily protect production, but it introduces substantial operational complexity. It requires accurate long-term forecasting, significant inventory investment and controlled storage over extended periods. If market demand diverges from expectations, organisations can face either shortages or excessive surplus stock.
Long-term inventory strategies also introduce secondary risks including moisture-related package degradation, traceability concerns, counterfeit exposure and evolving storage compliance requirements within extended supply chains.
Finding a replacement IC is seldom straightforward either. Even devices marketed as “drop-in compatible” frequently differ in electrical behaviour, analogue performance, timing characteristics, software dependencies or long-term roadmap stability. The resulting schematic modifications, PCB layout changes and requalification activities can become both costly and time consuming.
For automotive, aerospace and industrial platforms, these redesign cycles can also introduce fresh cybersecurity, reliability and functional-safety assessment requirements.
These approaches remain useful tools, but they largely treat obsolescence as a series of isolated supply events rather than addressing the underlying structural problem.
Using ASICs to manage obsolescence risk
For established products facing component discontinuation, ASICs can provide an alternative to repeated board-level redesigns.
Rather than attempting exact transistor-level duplication of an obsolete device, the objective is typically to preserve behavioural compatibility and maintain key electrical, timing and software interfaces while minimising impact on the surrounding hardware and firmware architecture.
Typical ASIC objectives in this scenario include:
- Behavioural and interface compatibility: Re-implement critical system functions while maintaining compatibility with surrounding subsystems and qualification constraints.
- Targeted integration: Consolidate adjacent analogue, mixed-signal or power-management functions into a single device, reducing component count and PCB complexity.
- Lifecycle control: Select process technologies and packaging strategies appropriate for long-term deployment rather than short consumer market cycles.
- Supply resilience: Reduce dependency on multiple vulnerable catalogue components by integrating stable functions into a controlled silicon platform.
A common approach combines a controlled last-time buy of the legacy component with parallel ASIC development. Once qualified, the ASIC becomes the long-term stable anchor for that function across current and future product variants.
This strategy becomes particularly attractive when the non-recurring engineering (NRE) investment can be amortised across multiple product families or long production lifetimes.
Designing new systems for lifecycle resilience
The more strategic opportunity is to consider lifecycle resilience during the original system architecture phase rather than after the first major EOL event occurs.
Incorporating critical functions into a custom ASIC from the outset enables system designers to:
- reduce dependence on volatile catalogue semiconductor roadmaps,
- simplify the bill of materials (BOM) and PCB layout,
- integrate safety, security and diagnostic functions directly into silicon,
- protect application-specific intellectual property,
- and improve long-term manufacturability.
For long-life industrial and automotive systems, mature semiconductor process nodes are often preferable to leading-edge geometries due to their greater manufacturing stability, broader foundry ecosystem support and reduced migration risk.
A common architectural approach is to stabilise long-lifecycle analogue, mixed-signal and hardware acceleration functions within the ASIC while preserving evolving software functionality and communications protocols within firmware layers.
Because lifecycle planning becomes part of the initial architecture definition, organisations can also proactively address:
- wafer banking strategies,
- mask set retention,
- package lifecycle management,
- second-source OSAT (Outsourced Semiconductor Assembly and Test) strategies,
- long-term test program portability,
- and future process migration planning.
Obsolescence management therefore becomes a defined engineering parameter rather than a reactive operational problem.
Engineering and commercial considerations
Before committing to an ASIC strategy, several practical questions should be addressed:
- What is the realistic cumulative lifetime volume across the product family and future derivatives?
- How disruptive would future redesign cycles become if standard components continue to be used?
- Which functions are genuinely stable and suitable for fixed silicon implementation?
- Which features are likely to evolve and should remain in software or programmable logic?
- What level of lifecycle assurance is required by customers or regulatory frameworks?
Working through these questions with an experienced ASIC partner allows organisations to identify where custom silicon delivers the strongest technical and commercial advantage, while continuing to leverage standard components where flexibility and rapid evolution remain important.
How EnSilica supports long-lifecycle ASIC strategies
Managing obsolescence through custom silicon requires both semiconductor design capability and practical understanding of long-term manufacturing, qualification and supply-chain management.
EnSilica has extensive experience in mixed-signal, RF and automotive-grade ASIC development for long-lifecycle and safety-critical applications across industrial, automotive, healthcare and satellite communications markets.
The company supports customers through the full ASIC lifecycle, including:
- early feasibility studies and obsolescence mitigation analysis,
- ASIC architecture and system partitioning,
- analogue, mixed-signal and RF integration,
- verification and qualification,
- wafer supply and lifecycle planning,
- package and second-source OSAT strategy development,
- and long-term manufacturing support.
For organisations facing challenging EOL notifications or developing platforms expected to remain in service for decades, engaging with an experienced ASIC team early in the programme can significantly expand the available technical and commercial options.
