# Electronic Component Lifecycle Status Reference (NRND, LTB, EOL)

> Source: https://netray.co/tools/electronic-component-lifecycle-status-reference
> Publisher: Netray (netray.co), AI and integration engineering for ERP and manufacturing systems.
> Section: Free Tools

## Short answer

Searchable guide to lifecycle terms such as NRND, last time buy, EOL and obsolete, with what each means and what a buyer or engineer should do.

## Category

electronics

## Industry

Electronics Manufacturing

## Audience

- Electronics buyer
- Component engineer
- Obsolescence manager
- Design engineer

## Tool

**Kind:** worksheet

**Mode:** reference

**Columns:**

#### Status or term

**Key:** term

**Type:** text

#### Typical meaning

**Key:** meaning

**Type:** text

#### Typical buyer or engineer action

**Key:** action

**Type:** text

#### Notes

**Key:** notes

**Type:** text

**Rows:**

#### Preliminary / Pre-release

**Meaning:** Part announced or sampling, specification may change

**Action:** Engineering only; do not commit to production volume

**Notes:** Datasheet may be marked advance or preliminary.

#### Active / In production

**Meaning:** Manufacturer is producing and selling the part

**Action:** Normal purchasing; watch lead time and change notices

**Notes:** Active does not guarantee a long future life.

#### Mature

**Meaning:** Production continues, no new features expected

**Action:** Safe for new designs with periodic checks

**Notes:** Not used by every manufacturer.

#### NRND

**Meaning:** Not recommended for new designs

**Action:** Do not select for new designs; plan a migration and consider a buffer

**Notes:** Usually precedes end of life but timing is not guaranteed.

#### Last time buy (LTB)

**Meaning:** Final window to order before production stops

**Action:** Compute lifetime demand, secure budget, place the order before the deadline

**Notes:** Deadlines are firm; orders are often non-cancellable.

#### Last time ship (LTS)

**Meaning:** Final date the manufacturer will ship the part

**Action:** Confirm delivery schedule against the LTB order

**Notes:** Often later than the LTB date.

#### Lifetime buy

**Meaning:** Purchase of the estimated remaining lifetime requirement

**Action:** Include forecast, spares, field repair and warranty demand

**Notes:** Over-buying creates excess; under-buying forces redesign.

#### EOL / End of life

**Meaning:** Manufacturer has decided to stop production

**Action:** Open an obsolescence case; review alternates, LTB and redesign

**Notes:** Wording differs; check the formal notice.

#### Discontinued

**Meaning:** Part is no longer produced

**Action:** Source remaining stock only through authorized channels first

**Notes:** Often interchangeable with EOL in listings.

#### Obsolete

**Meaning:** No longer available from the manufacturer

**Action:** Aftermarket, authorized remanufacture, substitute or redesign

**Notes:** Independent market carries counterfeit risk; test and verify.

#### PCN

**Meaning:** Product change notification for form, fit, function, process or site changes

**Action:** Review the change, assess impact, respond within the notice period

**Notes:** JEDEC JESD46 describes notification practice.

#### PDN

**Meaning:** Product discontinuance notification

**Action:** Trigger LTB analysis and alternates search

**Notes:** JEDEC JESD48 covers discontinuance notices.

#### Allocation

**Meaning:** Supply is rationed by the manufacturer or distributor

**Action:** Confirm commitments, forecast clearly and qualify alternates

**Notes:** Not a lifecycle stage but behaves like a risk flag.

#### Authorized aftermarket

**Meaning:** Licensed supplier continues to make or supply a discontinued part

**Action:** Evaluate for long term supply with proper traceability

**Notes:** Different from the open broker market.

#### DMSMS

**Meaning:** Diminishing manufacturing sources and material shortages

**Action:** Run a managed obsolescence process with monitoring and resolution

**Notes:** Term used in US defense programs.

#### Form fit function (FFF) replacement

**Meaning:** A substitute matching form, fit and function

**Action:** Qualify through engineering and update BOM and AVL

**Notes:** Customer approval may be required.

**Notes:** Manufacturers and data providers use their own labels and definitions. Always read the actual notice from the manufacturer and keep a copy. This reference is general guidance, not a substitute for the formal notice.

## Content

**Intro:** Lifecycle labels are used loosely across datasheets, distributor sites and aggregators. This reference explains what each common term usually means and what you should do about it, so a status change on a BOM line leads to the right action.

**Sections:**

#### How to use the table

**Body:** Search for the term you see on a datasheet, a distributor listing or an obsolescence tool. The table gives the typical meaning, a suggested action for buyers and engineers, and notes on where definitions differ. Export to Excel and use it as the dictionary for your lifecycle field in the item master, so everyone applies the same status and the same response across engineering, purchasing and planning.

#### How the lifecycle usually unfolds

**Body:** A typical path is pre-release, active, mature, NRND, then a discontinuance notice with a last time buy and last time ship date, then obsolete. Not every part follows this path, and timing varies from months to years. The key decision points are when you see NRND (stop designing it in), when you receive a PDN (calculate lifetime demand) and after LTS (shift to aftermarket, substitutes or redesign). Handle form, fit and function changes through PCN review and respond before the stated deadline or the change may be treated as accepted.

**Bullets:**

- Include warranty and field service demand in lifetime buy math.
- Ask for the last time buy terms in writing.
- Check whether the manufacturer offers die bank or licensed continued supply.

#### Common mistakes and ERP notes

**Body:** Teams often treat a distributor's lifecycle flag as authoritative when it may be a few weeks behind the manufacturer. Others ignore NRND until the part is hard to find. In ERP, store lifecycle status, last review date and the LTB deadline on the item or manufacturer part record, and report on all active BOM lines that carry NRND, EOL or obsolete parts. Connect the report to ECO triggers so an engineer owns each case. Never buy replacement stock from unvetted brokers without inspection and authenticity testing.

**Cta:** If lifecycle status lives outside your ERP, we can help map it to item and BOM records so at-risk assemblies are flagged automatically. Optional; the table works on its own.

**Faq:**

#### What does NRND mean?

**Answer:** NRND stands for not recommended for new designs. The part is still manufactured, but the maker advises against using it in new products, usually because a replacement exists or the part is heading toward discontinuance. Existing products can continue to buy it.

#### What is the difference between EOL and obsolete?

**Answer:** EOL means the manufacturer has decided to stop making the part, often with last time buy and ship dates. Obsolete usually means it is no longer available from the manufacturer at all. In listings the terms are sometimes used interchangeably.

#### When should I place a last time buy?

**Answer:** After you compute lifetime demand, check for qualified alternates and confirm the deadline and cancellation terms. Do it before the LTB date, since orders usually cannot be placed afterward. Include spares, field service and warranty needs.

#### What is the difference between a PCN and a PDN?

**Answer:** A PCN announces a change to the product, process or site and asks customers to review it. A PDN announces that a product will be discontinued. Both need a response plan, but a PDN triggers last time buy and redesign decisions.

## Search terms

component lifecycle status, nrnd meaning electronics, last time buy meaning, eol vs obsolete component, product discontinuance notice, pcn vs pdn, component obsolescence terms, not recommended for new designs

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