What’s the Difference Between NRND, EOL, and Allocation?

Article Highlights:

• EOL stands for “end-of-life.” As the name strongly implies, EOL is synonymous with obsolescence, and means that the manufacturer has—or is in the process of—permanently discontinuing a part.
• The acronym NRND stands for “not recommended for new design.” When a manufacturer designates a component as NRND, it’s typically a sign that the company is seeing a decline in sales for the part and is beginning to think about discontinuing it in the near future.
• Unlike the other statuses in the article, allocation is not a sign that a part is approaching obsolescence—indeed, it often indicates the opposite. Allocation is a situation where demand exceeds supply for a specific component, and the manufacturer needs to implement unique measures to offset that mismatch.

Electronic parts have a clear lifecycle, one that’s been firmly established over the past half-century. That cycle starts with introduction, moves into growth and maturity, and then transitions to saturation and, finally, decline. The final stage, decline, ends with obsolescence. Hundreds of thousands of components reach obsolescence every year: according to Z2’s internal databases, well over 600,000 electronic parts were discontinued by their manufacturers in 2025 alone. And while that figure was one of the highest in the 2020s, roughly half-a-million parts or more now consistently go obsolete every year. 

While end-of-life (EOL) is the highest priority for professionals working in resilience and lifecycle management, there are a few other critical stages an electronic component can enter prior to being discontinued by their manufacturer. And if those professionals want to stay on top of their bills of materials (BOMs) and continue sourcing parts without costly interruptions, they should have a strong grasp of them all. 

What Are the Lifecycle Stages for an Electronic Component?

While there are literally hundreds of millions of electronic components in the global marketplace at any one time, they all generally adhere to the same lifecycle. These five life stages were first proposed by Booz Allen Hamilton in the 1950s as a framework for understanding the trajectory of commercial products. 

Introduction and Growth

In the first stage, introduction, a part or product has passed through design, development, and prototyping. After reaching its final form with the manufacturer, it’s released into the market. The second stage, growth, is when the part or product begins to generate sales and yield revenue for the business producing it. It’s during this stage when the commodity may see rapid increases in demand, as marketing campaigns, reviews, and buzz build around the product. 

Maturity

In the third stage, maturity, the product has cultivated a robust customer base and is bringing in a consistent revenue stream for the company. Arguably equally important, the commodity has found its appropriate niche in the broader economy and is working to carve out the largest possible share of that market. The maturity phase may be seen as the prime of a product’s lifecycle, when it’s reached its peak in terms of utility, customer base, and sales. 

Saturation

Maturity is followed by the fourth stage, saturation. During this stage, a part or product runs up against its ceiling, so to speak, reaching the most possible customers and therefore the highest possible revenue for its manufacturer. One telltale sign that a good has reached the saturation stage is if sales start flattening following years of steady growth. Unless there’s a substantial undiscovered market for the product, this development signals that revenue has likely peaked, and will either continue plateauing or drop into decline. 

Decline

Finally, a product eventually reaches the fifth and final stage, decline. During this stage, a commodity sees its sales begin to decrease. The fifth stage may be triggered by a range of different external factors, including the introduction of more advanced technology, competitors who’ve successfully supplanted the product in its respective marketplace, or a cultural shift that’s changed the way the public perceives the product. Whatever the cause, this downturn is generally irreversible, and products that enter the fifth stage will ultimately transition into obsolescence. 

What Is EOL?

EOL stands for “end-of-life.” As the name strongly implies, EOL is synonymous with obsolescence, and means that the manufacturer has—or is in the process of—permanently discontinuing a part. In many cases, manufacturers will issue “EOL notifications” or product discontinuance notifications (PDNs) to customers prior to obsolescence. These notices are intended to give original equipment manufacturers (OEMs) and other businesses an opportunity to transition away from the component before it’s no longer available in the marketplace. Customers use PDNs and the obsolescence timelines they communicate as a chance to stockpile the part, search for viable cross-references, or even redesign the product in a way that no longer requires the component being discontinued. 

It’s important to note, however, that while EOL notices and PDNs can be a critical resource for OEMs to manage obsolescence and proactively mitigate the risks associated with it, many manufacturers do not consistently issue these notifications prior to discontinuing parts. According to Z2’s database, of the 620,000 parts that were obsoleted in 2025, less than half were accompanied by a PCN from the manufacturer. 

• 621,909: Total number of parts that went obsolete in 2025
• 298,623: Manufacturing part numbers (MPNs) that went obsolete and were accompanied by a product change notification from the manufacturer.
• 323,286: MPNs that went obsolete and were not accompanied by a PCN from the manufacturer.

According to Z2’s database, of the 620,000 parts that were obsoleted in 2025, less than half were accompanied by a PCN from the manufacturer. 

What Is NRND?

The acronym NRND stands for “not recommended for new design.” When a manufacturer designates a component as NRND, it’s typically a sign that the company is seeing a decline in sales for the part and is beginning to think about discontinuing it in the near future. In some cases, NRND indicates something slightly more specific: that the manufacturer will honor the longevity commitments it’s made to customers for the part, but will not continue to manufacture it beyond those dates. 

For professionals operating in obsolescence management, NRND is generally the first sign that a part is transitioning toward EOL. Part and BOM resilience teams often use the NRND notification as an opportunity to start enacting obsolescence management measures, including stockpiling and exploring the best available cross-references. As the name itself suggests, OEMs may still use the component in existing BOMs, but those interested in avoiding future disruptions should not incorporate the MPN into designs for products currently in development.

What Is LTB?

LTB stands for “Last Time Buy.” This is a notification that manufacturers send to their customers, informing them that they are entering the final period when a specific component can be purchased. The LTB stage comes well after NRND, when the supplier knows exactly when the part is going to be discontinued. Many companies use last time buys as an opportunity to stock up on an important commodity that’s close to discontinuance. This is not a permanent solution, of course, but it does give OEMs a grace period to strategize how to best modify BOMs using crosses, re-designs, and other techniques. 

What Is Allocation?

Unlike the other statuses in the article, allocation is not a sign that a part is approaching obsolescence—indeed, it often indicates the opposite. Allocation is a situation where demand exceeds supply for a specific component, and the manufacturer needs to implement unique measures to offset that mismatch. These measures include:

• Limiting the volume that customers can order.
• Only partially fulfilling orders.
• Raising prices dramatically, in an effort to bring supply and demand into greater balance. 
• Stretching out lead times.

In this phase, manufacturers are often only able to “allocate” a specific percentage of a customer’s order to them. In this way, the supplier works to distribute their available stock evenly across their customer base. 

Manage Component Lifecycles and NRND With Market Intelligence

We are in the midst of a historic memory chip supercycle, one in which demand for memory commodities is aggressively outstripping the available supply. As a result, prices for memory products have been surging for 12 months, inventory and lead times are fluctuating in unpredictable ways, and an increasing number of parts are going into allocation. To navigate this tumultuous electronic component landscape, businesses need market intelligence and real-time visibility. 

We are in the midst of a historic memory chip supercycle, one in which demand for memory commodities is aggressively outstripping the available supply.

Electronic supply chain solution Z2 helps OEMs and other businesses manage a volatile sourcing environment with a combination of actionable insights and benefits:

• Mitigating Obsolescence: Z2 has a suite of features that help organizations avoid components at imminent risk of obsolescence, while giving them the intelligence to respond decisively when a part discontinuance is announced. These include a large database of over one billion components; up-to-date information on every component’s lifecycle status; and a versatile cross-reference tool with advanced filtering capabilities. 

• Real-Time Market Intelligence: In a semiconductor environment as overheated as the current one, OEMs and other businesses are at high risk of overpaying for parts. With Z2’s industry-leading database of electronic components, professionals can compare pricing, lead times, inventory, and other substantive factors, helping them make more informed, cost-effective sourcing decisions. 

• Pinpointing Country Dependencies: Businesses overly dependent on a single country of origin for a disproportionate number of their components are vulnerable to everything from tariffs to export controls to emerging regulatory issues (for example, automotive parts manufactured in China using forced labor). Z2 provides detailed country of origin (COO), country of diffusion (COD), and country of assembly (COA) information to help firms identify key dependencies, along with the database and cross-reference search capabilities that allow them to diversify their supply chain accordingly.

To learn more about Z2’s market intelligence, schedule a free trial with one of our product experts.