What Is Component Obsolescence?
Also known as: end of life component, EOL part, last time buy, DMSMS
Definition
Component obsolescence is when a manufacturer discontinues an electronic part, so it can no longer be bought from normal channels. Managing it means detecting end-of-life notices early and choosing a last-time buy, substitute or redesign.
Component Obsolescence Explained
Electronic components have short product lives compared with the equipment they go into. Manufacturers issue product change notices (PCN) and end-of-life notices (EOL) with a last order date and last ship date. Products with long lives, such as aerospace, defense, medical and industrial equipment, are hit hardest. In US defense programs the practice is called DMSMS, diminishing manufacturing sources and material shortages.
Typical responses are a last-time buy (stockpiling enough parts for the expected life of the product), qualifying an alternate through the approved manufacturer list, buying from authorised aftermarket sources that continue making the part, or a redesign. Buying from independent brokers carries counterfeit risk and needs added inspection and testing.
Obsolescence management starts with the BOM. Every part is scored for lifecycle status using a data service or distributor information, and risk is aggregated by product. ERP items carry a lifecycle or status field, a planner flag, and where used reports show which assemblies are affected so engineering can plan changes.
Infor, NetSuite, SAP and similar ERPs usually hold the status and where-used data, while specialist lifecycle databases supply the external part status feeds.
Why It Matters
- An unplanned EOL on a single IC can stop shipment of a product with years of contract life remaining.
- Last-time buy quantities tie up cash and risk excess inventory, so they need forecast-based sizing.
- Counterfeit parts enter the supply chain mainly through shortages, so obsolescence handling is a quality issue.
- Customers in defense and medical may require documented obsolescence plans.
In Practice
A microcontroller used in 6 products gets an EOL notice with last order in 9 months. Annual usage is 8,000 units and the product line is contracted for 5 more years. Planning evaluates a last-time buy of about 40,000 plus a safety margin versus redesign cost, and the ERP where-used report lists the 6 affected assemblies and open orders.
Frequently Asked Questions
What is a last-time buy?
A final purchase of a discontinued part in a quantity meant to cover expected future demand until a replacement or redesign is in place.
How do you find obsolete parts in a BOM?
By checking each part against manufacturer notices and lifecycle data, then using an ERP where-used report to see which products are affected.
Why is buying from brokers risky?
Independent brokers are a common route for counterfeit or mishandled parts, so such parts need extra inspection and test.
Related Terms
Approved Manufacturer List (AML)
An Approved Manufacturer List (AML) lists the specific manufacturer and manufacturer part numbers (MPNs) that engineering has approved to satisfy a single internal component part number. It lets purchasing buy alternates without a BOM change.
BOM (Bill of Materials)
A BOM (bill of materials) is the structured, hierarchical list of components, sub-assemblies, and quantities required to produce one unit of a parent item, and it is the primary input MRP explodes to calculate material requirements.
Safety Stock
Safety stock is buffer inventory carried above expected demand to protect against variability in demand and supply during replenishment lead time. In ERP it is netted out of available inventory so MRP plans replenishment before the buffer is consumed.
Lead Time
Lead time is the elapsed time between initiating an order and having the material available for use. In ERP it is the offset MRP applies when back-scheduling a planned order from its due date to its release date.
Traceability
Traceability is the ability to follow the history, location, and application of a part or material through the supply chain and production process, both backward to its sources and forward to every product and customer it reached.
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DMSMS Obsolescence Management Worksheet
A part-by-part obsolescence tracker that computes months of stock cover and a likelihood-by-impact risk score so you can see which parts need a last-time buy or redesign first.
Keep exploring
Free tools
- DMSMS Obsolescence Management WorksheetA part-by-part obsolescence tracker that computes months of stock cover and a likelihood-by-impact risk score so you can see which parts need a last-time buy or redesign first.
- DMSMS Last Time Buy Quantity and Cost CalculatorCalculate how many parts to buy when a component goes end-of-life, what it costs to hold them, and when a redesign becomes cheaper.
- Component Obsolescence Risk AssessmentAnswer 10 questions to score how exposed your BOMs are to component EOL, DMSMS, and lifecycle blind spots, with graded recommendations.
Guides
- AI for Component Shortages and Obsolescence in EMSUse AI to handle component shortages, PCNs, EOL notices and last time buys in EMS: match alerts to open jobs and BOMs, with engineers approving every change.
- Supply Chain Resilience in Defense and Aerospace ManufacturingSupply chain resilience in defense manufacturing: DFARS 252.225-7008 specialty metals, DMSMS obsolescence, counterfeit parts, and second-source strategy.
- ERP Requirements for Electronics Manufacturers: What EMS Providers and OEMs Actually NeedERP requirements for electronics manufacturers: BOM and AML management, component lifecycle, traceability, compliance, costing, and AI agents for EMS and OEMs.
AI on your ERP
- Infor LN AI for High-Tech Electronics: BOMs, Shortages and TraceabilityPrivate AI on Infor LN for electronics makers: BOM and ECO impact, AVL shortages, obsolescence, RoHS and REACH data, and serial traceability, run on-prem.
- AI on SAP Business One for Electronics Manufacturers: BOMs, Shortages and TraceabilityPrivate AI on SAP Business One for electronics makers: multi-level BOM questions, component shortages, lot and serial traceability, RoHS and obsolescence checks.
Software
- SiliconExpertSiliconExpert is an electronic component intelligence service covering lifecycle, compliance and cross-references. See modules, integrations and alternatives.
- Z2DataZ2Data is a component and supply chain intelligence platform for electronics risk, compliance and lifecycle data. See modules, integrations and alternatives.