A product change notification is a formal announcement from a component manufacturer that something about a part is going to change. The change might affect the part's form, fit, function, quality, reliability or availability. Manufacturers send these notifications to the customers and distributors who have bought the affected products, and they arrive continuously.
Most of them do not matter to you. Some of them, if ignored, will stop your production line or force a redesign at the worst possible moment. Telling the two apart is the whole job.
The standards behind the notification
Two documents govern this, and they are commonly cited by the wrong names. The legacy JEDEC standards JESD46 and JESD48 were superseded in 2016 by joint JEDEC / ECIA / IPC standards. J-STD-046, the Customer Notification Standard for Product/Process Changes by Electronic Product Suppliers, is the change-notification standard. J-STD-048, the Notification Standard for Product Discontinuance, is the discontinuance standard.
Revisions to both were in progress through 2025, so confirm the current edition before citing one contractually.
They set the notice periods that most reputable manufacturers work to:
| Event | Minimum notice |
|---|---|
| Product or process change | 90 days before first shipment |
| Discontinuance, last order date (LTB) | 6 months from the notice |
| Discontinuance, last shipment date (LTS) | 12 months from the notice |
Treat these as floors rather than promises. Industry analysis suggests roughly 65 % of change notifications miss the 90-day window in practice. Some suppliers give far more warning than the standard requires, others far less. The notice period is a reason to monitor PCNs continuously, not a reason to relax.
PCN, PDN, EOL and obsolescence
The vocabulary here is muddled almost everywhere, including in a lot of published guidance, so it is worth being exact.
- A PCN is a product or process change notification.
- A PDN, or product discontinuance notification, announces that the part will stop being made. An EOL notice is the same thing under a different name. In standards terms a PDN is a special case of the PCN process: a change whose type is "discontinuance".
- Obsolescence is not a notification type but a state. A part becomes obsolete once it is no longer manufactured and only distributor or broker stock remains. The EOL notice is the announcement; obsolescence is the condition it leads to.
Treating "EOL" and "obsolescence" as two separate kinds of notification, as many internal classification schemes do, implies that a supplier sends both. They do not. What actually exists is a lifecycle:
Active → NRND → EOL / last-time-buy → Obsolete
NRND, "not recommended for new designs", is the step most people skip and the most useful one. The part is still in production and still buyable, but the manufacturer is signalling that it will not support it in new designs. Typically twelve to eighteen months separate an NRND flag from final shipment. It is the earliest actionable warning you will get, and it is the point at which redesigning is cheap and unhurried rather than expensive and forced.
Form, fit and function
Nearly every relevance decision reduces to whether a change affects form, fit or function, so the terms need to mean something. Form is the physical attributes: shape, size, mass, package type, footprint, lead and pad geometry, orientation. Fit is the interfaces: tolerances, mounting, interconnect compatibility, and whether the part still integrates with the existing assembly. Function is the electrical characteristics: operating parameters, performance and behaviour under the same conditions.
A change to any of the three normally requires requalification, a new part number or revision, and customer notification. Quality and reliability sit outside the FFF acronym, but a change to either carries the same weight.
Types of change, and how much each one matters
Manufacturers issue many kinds of change, and they carry very different levels of risk.
Discontinuance and EOL are always high relevance. The part is going away, and the notice carries the last-time-buy and last-time-ship dates. You have to decide whether to buy a lifetime stock, qualify an alternative, or redesign.
Direct component modifications are also high relevance: changes to physical characteristics such as pad geometry or package dimensions, or to firmware and silicon behaviour. These touch form, fit or function directly, so they need evaluation by definition.
Manufacturing site changes are high relevance and always worth evaluating. Moving wafer fabrication, assembly or test to a different site or country is one of the strongest requalification triggers there is, even though it can look like an administrative matter on paper. AEC-Q100 requires a minimum of one test lot per affected wafer-fab or assembly site, and qualification devices must come from the production tooling at the new site. In automotive supply chains a site change routinely forces full requalification and PPAP re-submission.
Base material changes can be major, so evaluate them rather than assuming they are benign. They cover mould compound, lead-frame material and plating, die revision and die shrink, and changes of raw-material supplier. It is tempting to file these as cosmetic, but they rarely are. A lead-frame plating change can alter mould-compound adhesion by a large factor and cause delamination. Mould-compound changes alter the coefficient of thermal expansion and the ionic content of the package, which drives package cracking, wire-bond corrosion and intermetallic failure. A die shrink changes the silicon itself and is an explicit AEC-Q100 requalification trigger. Base-material changes frequently affect reliability, and reliability failures show up in the field rather than on the line.
Datasheet modifications are worth a look. Often they are a genuine correction, or a clarification with no product change behind them. Sometimes they tighten or loosen guaranteed parametric limits, or they are the visible surface of a characterisation change. Read what changed before concluding that nothing did.
Outer packaging modifications are usually low relevance, though not always. This is reel quantity, tape and reel versus tray, or label format, and it is mostly harmless. But a carrier or tape change affects feeder setup on the placement machine, and a change to the moisture sensitivity level changes floor life, bake requirements and reflow handling. Both have real production consequences.
Indirect modifications are usually low relevance too. These are superficial changes with no effect on dimensions or performance, such as the marking printed on a component housing. They are worth knowing about for incoming inspection but rarely worth acting on.
Which notifications are actually relevant
Relevance is risk-based, not categorical. Two questions decide it:
- Does the change plausibly affect form, fit, function, quality or reliability? If it does, it is relevant regardless of which box it arrived in.
- What qualification regime does the end product live under? This is the one people forget.
That second question changes the answer completely. In a general industrial product, a packaging change is noise. In a regulated supply chain it may not be.
Automotive work under IATF 16949 needs written customer approval before a design or process change goes into production, and notification for anything affecting fit, form, function, durability or performance; PPAP re-submission may follow. Medical suppliers under ISO 13485 and FDA 21 CFR 820 (now the QMSR) are expected to give notice of changes to purchased product before implementation, along with an impact and risk assessment. Aerospace suppliers under AS9100 must document, review and communicate any change affecting form, fit or function, and obtain approval before making it.
In these sectors a PCN is not an informational email; it is the start of an approval process, and a change implemented without approval can put a whole qualification at risk.
How PCNs reach us
We receive notifications directly from manufacturers and forwarded from distributors, for the parts purchased for our customers' assemblies. The volume is substantial and the formats vary. The industry response has been to standardise the data: SmartPCN, an XML format maintained by COG Deutschland and anchored in the German standard VDMA 24903, makes notifications machine-readable so they can be matched against a bill of materials automatically. Commercial aggregation services such as SiliconExpert, Z2Data and Accuris consolidate notices from hundreds of manufacturers for the same purpose.
What Newmatik does with them
We screen every notification we receive against the assemblies we build.
We assess each one for whether it affects the form, fit, function, quality, reliability or future availability of a part on one of our customers' bills of materials. We forward the notifications that pass that filter by email, and we include the material you need to act on, not just the manufacturer's PDF:
- The original notification
- The last-time-buy and last-time-ship dates, where applicable
- The manufacturer's recommended alternative for a discontinued part
- A list of your affected assemblies
We file the notifications that have no bearing on anything we build rather than forwarding them. We do not pass on the noise.
We process and relay these quickly, because the value of a PCN decays with time. A six-month last-time-buy window that reaches you with two months left is a different, and much more expensive, problem than the same notification received on day one. Early warning is what buys you the choice between placing a bridge order, qualifying an alternate part, and redesigning, rather than having the choice made for you.
If you would like to review the lifecycle exposure on an existing bill of materials, or discuss how we monitor changes for your assemblies, our team is happy to help. Related reading: our inspection checklist for broker parts, for when a last-time-buy window has already closed.
Sources
- J-STD-046, Customer Notification Standard for Product/Process Changes by Electronic Product Suppliers (supersedes JESD46)
- J-STD-048, Notification Standard for Product Discontinuance (supersedes JESD48)
- AEC-Q100 Rev-J1, Failure Mechanism Based Stress Test Qualification for Integrated Circuits
- IATF 16949:2016, clauses 8.3.4.4 and 8.5.6, product approval process and control of changes
- ISO 13485:2016 and FDA 21 CFR 820 / Quality Management System Regulation
- AS9100, configuration management and change control
- VDMA 24903, Obsolescence management: exchange of information regarding change and discontinuance of products and items (SmartPCN)