Table of Contents
A certificate of conformance is useful only when its statement can be connected to the material delivered. A convincing PDF attached to an unrelated shipment offers little protection against a wrong ordering code, mixed lot, or quantity discrepancy.
For electronic-component receiving, review the issuer, scope, and shipment linkage before treating a CoC as an acceptance record. This guide provides a document reconciliation method; it does not define universal certificate wording or claim that every manufacturer uses the same fields.
A manufacturer certificate, an authorized distributor certificate, and an independent distributor certificate can describe different parts of the transaction. Preserve the issuer’s actual role. Do not rename a seller’s declaration as an original manufacturer certificate simply because it reproduces a manufacturer name.
For example, TI’s online-order CoC policy, checked on September 15, 2026, describes downloading certificates through the applicable order in a myTI account. It also states that sample orders do not receive CoCs. Document availability is therefore tied to a defined transaction and policy, not merely to the existence of a TI part number.
For each certificate, record the legal issuer, document identifier, issue date if supplied, referenced order or shipment, and exact statement being made. Verify unexpected documents through an independently established supplier contact or portal.
The document-to-material reconciliation
The following is an editorial receiving worksheet. It identifies checks to agree with the supplier, not mandatory fields imposed on every CoC.
| Record | Match against | Unresolved condition |
|---|---|---|
| Purchase order | Full manufacturer part number and approved deviations | Certificate describes only a family name |
| Certificate | Issuer, scope, and shipment reference | Issuer or covered transaction cannot be verified |
| Packing list | Quantity delivered and package count | Quantity differs from the certificate without explanation |
| Reel, tray, or tube labels | Manufacturer, part, lot/date identifiers where provided | Labels cannot be linked to the shipment |
| Receipt record | Accepted, quarantined, sampled, and returned quantities | Material disappears from the reconciliation |
| Inspection or test report | Sample identity and parent lot | Report covers another lot or an undefined sample |
Retain the original file and any subsequent correction as separate versions. A buyer-created spreadsheet can connect records, but it should not overwrite the supplier’s original statements.
The date-code and traceability guide addresses marking checks. Here, the question is whether the documents and quantities describe one coherent material flow.
A split-shipment example
Consider an illustrative order for 1,000 units delivered in two shipments of 600 and 400. A certificate for the entire order may be usable only if the supporting records clearly connect each delivery to the covered material. Do not attach it twice and record 2,000 certified units.
If the 600-unit delivery contains two lots, preserve separate lot quantities. If an inspection consumes ten devices, reconcile whether the ten came from one lot or both and whether they remain usable. The receiving system should retain the distinction between delivered quantity and released quantity.
Repacking adds another link. Request the original package identity, repacking record, resulting package identifiers, and quantity reconciliation. A fresh distributor label cannot by itself recreate an undocumented original lot.
What missing or conflicting documents mean
A missing certificate does not by itself prove that parts are counterfeit. It can still make the delivery unacceptable when a certificate was part of the purchase requirement. Separate those conclusions in the disposition record.
Similarly, a generic RoHS statement, a test report, and a CoC answer different questions. Environmental declarations concern material compliance within their scope; test reports concern specified observations; conformity statements concern the issuer’s declared requirements. Do not substitute one simply because it is available.
When supplier identity, ordering code, or shipment linkage conflicts, hold the affected material for resolution. Request a corrected document from the issuer with a traceable explanation. Avoid editing the PDF to make it agree with the purchase order.
Define acceptance before the shipment arrives
Specify the required document package during the RFQ comparison and carry it into the award. Name the records required before shipment and those that can accompany delivery.
For industrial sourcing programs, the useful release record includes the accepted ordering code, reconciled quantity by lot, document version, unresolved exceptions, and the responsible approver. It should also define where records will be retained and how they can be retrieved for a later failure investigation.
A complete reconciliation makes the certificate useful to purchasing, receiving, and quality teams throughout the component’s service life.
Frequently Asked Questions (FAQ)
Is a distributor CoC equivalent to a manufacturer CoC?
No. Each document records the statement of its issuer. A distributor document does not automatically establish manufacturer origin or transfer manufacturer warranty coverage.
Must a CoC include the date code?
The required fields depend on the issuer, product, and purchase requirements. If lot or date code is not on the certificate, require a reliable cross-reference to the shipment and packaging records where that identity is recorded.
Can a CoC replace inspection or testing?
No. A certificate is documentary evidence. Inspection and test requirements depend on the application and procurement agreement; a document does not demonstrate electrical performance by itself.
