Approve an exception to component date-code restrictions only when the offered material has been identified, the relevant storage and condition evidence has been assessed, and the people responsible for the requirement have authorized the deviation. Keep that approval limited to specified material and quantities. An older date code does not automatically make a semiconductor unusable; a recent code does not establish its authenticity or condition.
For an OEM or contract manufacturer, the purchasing question is specific: can this offered stock be accepted for this build under the applicable requirements? Answering it takes more than a supplier email saying that older parts are common. The following approach focuses on packaged semiconductor offers; batteries, chemicals, and other technologies with different aging mechanisms need their own manufacturer guidance.
Find out why the date-code limit exists
Before asking a supplier for newer stock, locate the source of the restriction. It may come from a customer specification, a supplier quality agreement, an application-specific concern, or an internal purchasing rule carried forward from earlier orders. Establish who owns it and who can approve an exception.
Also clarify how age is measured. A limit applied at quotation, shipment, or receipt can produce different results. Confirm the manufacturer's meaning of the supplied code rather than assuming every marking represents the same manufacturing event. Keep manufacturing information, bag-seal dates, and any stated expiration dates separate.
Published purchasing rules demonstrate why this matters. Section 4.1.3 of Celestica's purchased-product requirements, revision 10, specifies a 24-month limit at receipt for covered goods without a supplier-defined shelf life, unless its QSPEC states otherwise. It provides a signed agreement or waiver route with supporting justification when the requirements cannot be met. This is a company-specific purchasing requirement, not a universal semiconductor expiry date.
If the restriction belongs to your customer, obtain the required customer decision through the established process. Internal confidence in the parts does not resolve an unapproved departure from that customer's requirement.
Apply manufacturer shelf-life guidance to the actual offer
The ECIA's June 2023 date-code guidance recommends avoiding general age restrictions for purchases from component manufacturers and their authorized distributors. It also recognizes specific technical reasons for restrictions. Its stated channel and handling context matters when assessing an offer from a different supply path.
Texas Instruments' product shelf-life guidance describes studies supporting TI's controlled internal storage practices and bases minimum useful life on delivery to the customer. It also emphasizes customer storage and handling. Those findings support reviewing an age-only objection; they do not document how an unrelated supplier stored a particular lot.
Manufacturer policies also differ. Monolithic Power Systems' January 2023 declaration gives its analog IC devices a five-year shelf life based on production date code, assuming the moisture barrier bag seal remains intact. Do not turn that statement into a five-year acceptance rule for another manufacturer's products.
Save the guidance applicable to the exact manufacturer and product with the review. Where its scope or conditions are unclear, seek clarification. A general shelf-life study cannot fill an unexplained gap in the offered material's history.
Request evidence that answers the unresolved questions
Ask for a defined offer before debating a waiver. Identify the complete manufacturer part number, package and grade, condition, quantity, proposed date codes, and available lot identifiers. Have the supplier distinguish information already verified from information still being requested upstream.
| Review question | Useful evidence | Gap to resolve before approval |
|---|---|---|
| Which material is being offered? | Identified quantities, manufacturer labels, and available lot and date-code records. | A broad date range without identification of the stock that will ship. |
| How was it obtained and held? | Available source documents, custody records, and storage information covering the relevant period. | A generic warehouse policy without a connection to this material. |
| Do the manufacturer's storage conditions apply? | Applicable product guidance, packaging history, and relevant environmental or exposure records. | Unknown handling, opening, resealing, or storage conditions. |
| What condition assessment is needed? | A quality-approved inspection or test scope with identified samples and acceptance criteria. | A report that does not identify the offered material or address the actual concern. |
| What commercial protection applies? | Written confirmation of the supplying party's warranty and discrepancy process for this offer. | An assumption that manufacturer-direct warranty terms apply to every supply route. |
Request photographs of accessible labels and packaging without unnecessarily opening protective packing. Where moisture-sensitive handling is relevant, manufacturing age, sealed storage, and exposure before soldering need separate consideration. This review should establish whether the evidence is sufficient; it should not prescribe a default bake or test for every older component.
For the identifier relationships that must survive receiving and production, see Cplus's guide to component lot traceability through split shipments and PCB builds.
Use a limited exception when only part of the offer is supported
Hypothetical example: An OEM needs 2,000 ICs within 21 calendar days. Its purchasing requirement limits component age to 24 months at receipt. A supplier proposes three separately identified groups:
- 800 pieces within the age limit, with the required documentation.
- 600 pieces aged 42 months, with source, packaging, and storage evidence available for review.
- 600 more pieces of the same age from different material, with an unexplained storage-history gap.
Assume engineering and quality find the first older group acceptable under the applicable manufacturer guidance, and the requirement owner approves a deviation for those 600 pieces. The result is 1,400 potentially releasable pieces, subject to the agreed receiving checks. The other 600 remain unresolved. The approval does not extend to them merely because their part number and age match.
Planning must still address the remaining shortage. If review takes eight days and shipment takes five more, the approved material would arrive on day 13 under these illustrative assumptions. The supplier's five-day shipping estimate alone never represented the complete approval-and-delivery schedule.
This is the practical value of reviewing identified quantities: it exposes how much supply the decision actually covers, while keeping unsupported stock outside the approval.
Record exactly what the date-code exception permits
Use the company's controlled deviation or concession process. A useful record identifies the original requirement, proposed departure, technical rationale, evidence reviewed, approvers, and decision date. Define its scope with:
- The manufacturer, complete part number, identified material, and maximum approved quantity.
- The supplier quotation and purchase-order line to which approval applies.
- The permitted build or program, delivery window, and any use restrictions.
- Required inspection, testing, documentation, and receiving-release conditions.
- Changes that require renewed review, including replacement lots or different packaging history.
Separate authorization to purchase or ship from authorization to release material into production. If acceptance remains conditional on receiving inspection, make that condition visible to purchasing, the supplier, and receiving. A one-order waiver should not silently change the standing date-code requirement for future purchases.
Make date-code flexibility visible in the sourcing request
State whether your age limit is mandatory or whether identified older stock may be proposed separately for approval. Include the age-measurement point, required evidence, approval route, and the time available for review. Ask suppliers to flag exceptions before shipment. Avoid a vague instruction such as “new stock preferred” when receiving will enforce a firm limit.
Cplus Electronics lists semiconductor procurement and hard-to-find component sourcing among its products and sourcing services. For a relevant enquiry, provide the exact manufacturer part number, quantity, need date, approved alternatives, date-code restriction, and documentation requirements. Clearly distinguish an invitation to quote older material from permission to supply it.
Submit your component requirement to Cplus with the part-number and quantity lines. The page accepts multiple parts and includes a shortage-list attachment option; use a requirement sheet to explain the age limit and any proposed exception-review conditions. Its published instructions also provide an email route for a spreadsheet or BOM. A precise request gives the sourcing team a usable acceptance boundary before you commit to an offer.
