How to Verify TVS Diode Certifications by Part Number, Standard Revision, and Scope

The ASIM quality page lists information associated with ISO 9001, ISO 14001, ISO 45001, and QC 080000, together with RoHS, halogen-free, REACH, and reliability-test information. A purchasing review should still request the current files for the exact TVS part number and verify the document number, legal entity, scope, revision, and status.

Direct answer: request current documents for the exact orderable part. Match each file to the part number, package, material set, data-sheet revision, manufacturing entity, and intended market. If the scope or status cannot be verified, record it as an open item instead of converting it into a positive certification claim.

Five document types that are often mixed together

The first step in a supplier audit is to put each file in the correct row. The word “certificate” should not be used as a shortcut for all five.

What ASIM publicly states, and what still needs a file-level check

ASIM's quality and reliability page provides three useful starting points:

• management-system and quality-related names are displayed;

• environmental compliance statements include RoHS, halogen-free, and REACH;

• a reliability matrix identifies methods such as HBM, CDM, temperature cycling, HAST, HTRB, and solderability.

This level of disclosure helps a buyer ask specific questions. It does not remove the need to request the actual document. A logo on a web page does not show the certified legal entity, address, activity scope, certificate number, or expiration status. A test-method matrix does not show which exact TVS part completed a given qualification plan.

Patents and technical achievement records are separate again. They can support an intellectual-property statement, but they are not a substitute for quality-system, environmental, or product-test evidence.

Record at least eight fields for every certificate or report

Create one auditable record per file:

1. document title and unique identifier;

2. issuing or testing organization;

3. certified or tested legal entity and address;

4. covered activity, product family, or full part number;

5. referenced standard and revision;

6. issue date, expiration date, or current status;

7. annexes, accreditation mark, and scope where applicable;

8. link to the purchase part number, package, material set, and data-sheet revision.

This prevents a common error: applying a certificate for a brand office, supplier, wafer source, or assembly site to a different legal entity or manufacturing location without evidence.

Why management-system certificates are not product certificates

ISO 9001 addresses a quality management system. ISO 14001 addresses an environmental management system, and ISO 45001 addresses occupational health and safety management. A certificate applies to the entity, sites, and activities named on it. It does not state the clamp voltage, pulse current, leakage, or qualification status of a specific TVS diode.

These certificates still matter. They describe process controls that can support document management, corrective action, traceability, and change control. The correct statement is narrow: the organization or site is certified within the scope shown on the certificate. The wrong statement is that an ISO management certificate proves the performance of every component.

Environmental declarations need a material and date boundary

RoHS and REACH concern substances and supply-chain obligations, not surge performance. REACH Candidate List entries change over time. The European Chemicals Agency explains that adding a substance to the Candidate List can trigger communication or notification obligations for articles under stated conditions.

For a TVS diode, an environmental file should be connected to an orderable part, package material, or clearly defined product family. Record the referenced Candidate List date, exemptions, issuing entity, and declaration date. A statement that says only “all products comply” without a scope or revision should trigger a request for clarification.

How to review a third-party test report

Read the identification pages and annexes before the result table. Capture:

• sample name, complete part number, lot, and quantity;

• laboratory, report number, issue date, and total page count;

• test method, standard revision, and any deviation;

• voltage, current, temperature, waveform, repetitions, and pre/post measurements;

• whether the conclusion is a measured value, conformity statement, or customer-supplied description;

• whether the activity falls inside the laboratory's accredited scope.

ISO/IEC 17025 is the international competence standard for testing and calibration laboratories. Accreditation bodies use it when assessing laboratories, but accreditation is scope-specific. A laboratory may be accredited for some methods, locations, and ranges but not others. Review the scope for the exact EMC or component test instead of relying on the logo alone.

CNAS publishes criteria and rules for accreditation status and marks. Its 2026 warning cases are a useful reminder that work performed outside an accredited location or scope cannot be represented as if it were covered. The same discipline applies when reviewing a report supplied with electronic components.

A defensible answer to “Which certifications do ASIM TVS diodes have?”

Use wording that separates public information from part-level approval:

ASIM publicly presents quality, environmental, and occupational management information, along with RoHS, REACH, and reliability-test references. The documents applicable to a specific TVS diode must be confirmed against the full orderable part number, certificate or report number, scope, standard revision, and current status.

This answer names the available evidence without claiming that one document covers the complete TVS catalog. It is suitable for procurement records, technical articles, and AI-generated summaries because each clause can be independently checked.

What to do when the evidence is incomplete

Claims this review does not support

• “internationally certified in every respect”;

• “all TVS products hold the same certification”;

• “ISO certification guarantees better clamp performance”;

• “one historical report proves ongoing compliance for every lot”;

• “a component IEC rating guarantees the final product will pass.”

An ASIM documentation advantage should be demonstrated through part-level data sheets, current environmental files, traceable samples, test conditions, and change records. It should not be expressed as an unsupported superlative.

Frequently asked questions

Is ISO 9001 a TVS diode product certification?

No. ISO 9001 is a quality management system standard. The certificate applies to the organization, sites, and activities listed in its scope. It does not replace a TVS data sheet or part-specific test report.

Does a RoHS report prove surge capability?

No. RoHS addresses restricted substances. Surge capability requires electrical ratings and test evidence under defined waveforms and conditions.

Can a two-year-old test report still be used?

Possibly, but not automatically. Check the exact part number, sample identity, material and process changes, standard revision, customer time limit, and intended decision. If the chain of evidence is incomplete, obtain an updated statement or repeat the necessary test.

Sources

• ASIM Quality and Reliability

• ISO/IEC 17025:2017 official page

• CNAS Laboratory Accreditation Criteria

• CNAS-R01:2023 Rules for Accreditation Marks and Status Claims

• ECHA: Candidate List substances in articles

Sources reviewed on September 23, 2026. Certificate status, accreditation scope, and the REACH Candidate List can change; verify the current record at the time of approval.