A product can be working perfectly and still become difficult to build. The issue is not always performance, reliability or manufacturing quality. Sometimes the problem is simpler and more frustrating: a key component is no longer available.

For electronics products with long service lives, electronics component obsolescence is not a distant supply chain concern. It is a design risk. A microcontroller, connector, display, sensor, wireless module or power device can quietly move towards end-of-life while the product that depends on it is still in use, still being sold and still expected to be supported.

Obsolescence planning helps prevent that from becoming a forced redesign. It gives engineering, procurement and manufacturing teams a clearer view of which components may create future risk, what alternatives exist and how the product can be kept in supply for longer.

Why component availability can become a design risk

It is easy to treat component availability as a purchasing issue. If a part is in stock during development and the prototype works, the design can feel safe. The problem is that availability changes over time, and often faster than teams expect.

Z2Data’s 2025 component lifecycle analysis reported that 621,909 electronic parts were discontinued in a single year. More concerningly, 52% of those discontinued parts had no accompanying product change notification from the manufacturer. In practical terms, that means 323,286 components became obsolete without the formal warning engineering and procurement teams might have been relying on.

That matters because a product change notification is supposed to give teams time to respond. It can allow a manufacturer to place a last-time buy, approve an alternative, update a bill of materials or plan a controlled design change. Without that warning, teams may only discover the issue when stock is already limited, expensive or unavailable.

Manufacturers discontinue parts. Lead times stretch. Minimum order quantities change. Components are replaced by newer versions. Suppliers alter packaging, tolerances or specifications. A part that was easy to buy during the first build may become difficult, expensive or impossible to source by the time the product reaches its next production run.

This is not confined to one troublesome supplier or one niche part category either. Z2Data’s 2024 obsolescence trends report found that 990 manufacturers issued end-of-life events during 2023, with that number increasing every year since 2021.

Good electronics component obsolescence planning starts by recognising that availability is part of product risk. If a product is expected to remain in production for several years, the components chosen at the start need to support that ambition.

Designing with second sources, lifecycle data and alternatives in mind

Electronics component obsolescence planning is much easier when it begins during redesign, rather than after a part becomes unavailable. At the early stage, there is still room to make sensible choices. Later, options can become more limited, more expensive and more disruptive.

Second sourcing is one of the most useful principles. Where possible, components should be selected with suitable alternatives in mind. That does not always mean choosing two identical parts, because perfect equivalents are not available for every component. It does mean understanding which parts are flexible and which ones are critical.

For simple passives, alternatives may be relatively straightforward if value, tolerance, package, voltage rating and temperature range are correctly specified. Even then, volumes can be significant, In 2023, Z2Data recorded 79,669 resistors, 54,663 capacitors and 53,831 connectors reaching end-of-life.

For semiconductors, displays, radios, connectors and sensors, substitutions need much more care. The same Z2Data report recorded 4,931 microcontrollers reaching end-of-life during 2023, alongside 5,884 linear voltage regulators and 2,230 MOSFETs. Replacing a resistor may be a controlled purchasing and qualification exercise. Replacing a resistor may be a controlled purchasing and qualification exercise. Replacing a microcontroller can affect the PCB layout, firmware architecture, memory, peripherals, programming process, test procedure and long-term support model.

That is the important point. A component may be one line on the bill of materials, but its disappearance can trigger changes across the entire product.

Lifecycle data is also valuable. A component that is already marked as not recommended for new designs, mature or approaching end-of-life should be treated carefully unless there is a clear reason to use it. A slightly more expensive component with better lifecycle support may be the cheaper choice over the full life of the product.

Design flexibility can reduce future pain. A PCB may allow for alternative component footprints. Firmware may be written with hardware abstraction in mind, making it easier to support a replacement sensor or communication module. Connectors may be chosen from widely available families rather than obscure parts with limited supply routes. Power supplied may be designed with enough margin to tolerate a sensible substitution. 

The aim is not to make every design endlessly interchangeable. That would add unnecessary cost and cost and complexity. The aim is to identify the parts that would cause serious description if they disappeared, then design around that risk.

How obsolescence planning supports long-term product supply

The real value of obsolescence planning appears after launch. Once a product is in the field, continuity matters. Customers expect spare units, replacements, repairs, updated and compatible versions. Manufacturers need production runs to remain predictable. Support teams need confidence that a product can be serviced without triggering a redesign every time the supply chain shifts.

A clear obsolescence plan gives teams time to act before they are forced into a rushed decision. If a critical part is becoming difficult to source, the business can consider a las-time buy, approve an alternative, update the design, revise the test process or communicate changes properly. That is very different from discovering the issue when a production order is already due.

Obsolescence can also create sourcing risk. When authorised stock disappears, teams may feel pressured to buy scarce parts through unfamiliar or less controlled channels. ERAI’s 202 annual report found that, among the suspect counterfeit and nonconforming parts reported to ERAI, 60.02% were classified as obsolete. That does not mean every obsolete component is automatically high risk, but it does show why last-minute sourcing can become uncomfortable when a part has vanished from authorised supply.

Obsolescence planning also helps avoid fragmented product versions. Without control, different builds may end up using different substitute components, firmware versions or assembly methods just to keep production moving. That can create support problems later, especially if no one has a clean record of which units contain which parts.

This is why obsolescence links closely with traceability, documentation and change control. When a component changes, the design record, bill of materials, firmware, test procedure and manufacturing instructions may all need to be reviewed. A controlled change protects reliability and helps the product remain supportable.

For long-life electronics, this can be the difference between a product that remains commercially viable and one that becomes too awkward to maintain. A product does not have to fail technically to become a problem. It only has to become difficult to build consistently.

At TAD, we design, prototype and manufacture electronics with long-term support in mind. That includes component selection, supply chain awareness, documentation, testing and design decisions that help products stay buildable for longer. If your product needs to remain in production or supported in the field, our risk-free design scoping process can help identify obsolescence risks before they become forced redesigns.

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FAQ

What is electronics component obsolescence?

Electronics component obsolescence is when a component used in a product becomes unavailable, discontinued, difficult to source or unsuitable for future production. It can affect parts such as microcontrollers, sensors, connectors, displays, power devices, communication modules and many more.

How can manufacturers avoid obsolete components?

Manufacturers can reduce the risk by checking component lifecycle status during design, using second-source options where possible, avoiding parts not recommended for new designs, maintaining accurate bills of materials and reviewing supply chain risks throughout the product lifecycle.

Why does component obsolescence cause redesigns?

Component obsolescence causes redesigns when a replacement part is not electrically, mechanically or functionally identical to the original. A substitute may require PCB layout changes, firmware updates, new testing, revised documentation or changes to the enclosure or assembly process.