Japan Mandates DPT Certification for SiC Power Modules

On June 21, 2026, Japan formally made JIS C 0920:2026 mandatory, turning double pulse testing (DPT) into a required market-entry certification item for automotive and industrial-grade SiC MOSFET power modules. For companies selling SiC devices into Japan, this is not just a technical compliance update but a practical change affecting certification access, JIS mark eligibility, supplier qualification, and delivery planning, especially for exporters that now face longer certification lead times and in-country testing requirements.

What the new JIS requirement now covers

The confirmed change is that JIS C 0920:2026 entered mandatory enforcement on June 21, 2026. Under this standard, DPT is included for the first time as a compulsory admission-type certification item for automotive and industrial-grade SiC MOSFET power modules.

The rule applies to all SiC devices sold into the Japanese market. Products that do not obtain the required certification cannot enter the JIS certification catalog, which in turn affects the ability to carry the JIS mark and may influence access to second-tier supplier lists used by OEMs.

For Chinese SiC module exporters, the confirmed operational impact is a longer certification cycle of eight to ten weeks, with actual testing required at laboratories recognized in Japan.

Where the immediate pressure is likely to appear

Export-facing module suppliers face a timing issue first

From an industry perspective, the most direct effect falls on companies already shipping SiC devices to Japan or preparing to enter that market. The key pressure point is no longer only product performance, but whether certification can be completed in time for sales planning, customer onboarding, and ongoing supply commitments.

OEM supply chain access may become more documentation-driven

For businesses seeking inclusion in OEM-related supply chains, the rule matters because products without certification cannot enter the JIS certification catalog and may face obstacles in second-tier supplier access. What deserves closer attention is the growing connection between technical test completion, formal qualification status, and commercial entry into customer programs.

Testing and delivery coordination become more sensitive

For supply chain and commercial teams, the requirement for testing in Japan-recognized laboratories adds a coordination layer to product launch and shipment planning. Analysis shows that certification timing, laboratory scheduling, and customer delivery expectations are likely to become more tightly linked in practice.

What companies should monitor now

Track how enforcement is applied in actual transactions

Companies should distinguish between the formal rule itself and how customers, certification bodies, and supply chain partners apply it in day-to-day business. The standard is already mandatory, but the practical handling of catalog entry, mark usage, and supplier acceptance is where commercial impact becomes concrete.

Review affected product lines and Japan-bound pipelines

Businesses with automotive-grade or industrial-grade SiC MOSFET power module shipments tied to Japan should review which product lines are directly exposed. The immediate question is not broad strategy but whether current and near-term programs depend on certification steps that now take eight to ten weeks.

Prepare for longer lead times in customer communication

For sales, operations, and account teams, customer communication needs to reflect the longer certification cycle. Observably, lead-time expectations, quotation validity, and delivery commitments may need to be aligned with the new testing path rather than past approval assumptions.

Pay close attention to testing readiness and supporting materials

Because actual testing must be completed at Japan-recognized laboratories, companies should pay attention to whether internal preparation, technical materials, and coordination documents are sufficient for a smoother certification process. This is less about broad compliance language and more about operational readiness.

Why this reads as more than a routine standards update

Analysis shows that this development is best understood as a concrete access-control signal rather than a symbolic standards revision. The importance of the change lies in the fact that DPT is no longer only a technical evaluation topic but a mandatory gate tied to certification status, labeling eligibility, and parts of supplier market access.

At the same time, it is more appropriate to understand this as an active compliance and execution issue rather than a fully settled long-term industry outcome. The rule is already in force, but its broader commercial effects will depend on how companies, customers, and certification workflows adapt in the months ahead.

How to read the industry significance at this stage

The current significance of this update is clear: access to the Japanese market for relevant SiC devices now depends more directly on completion of a specific mandatory test path. For affected companies, this is a near-term operational issue with longer-term strategic implications for qualification planning and customer access.

In neutral terms, this is best read as an implemented regulatory change with immediate business consequences, while its full market impact still requires continued observation. The most relevant focus for industry participants is execution speed, certification planning, and the alignment between compliance timing and commercial commitments.

Basis of this article and points for continued verification

This article is based on the user-provided news title, event date, and event summary. The available information confirms the mandatory implementation date, the inclusion of DPT as a compulsory certification item, the scope covering SiC devices sold into Japan, the consequences for JIS catalog access and JIS mark use, and the extended certification cycle and in-country testing requirement for Chinese exporters.

For this type of industry update, commonly relevant source categories may include official notices, company disclosures, industry association updates, authoritative media reporting, and standards organization documents. A specific official source link was not provided in the input, so further verification remains necessary. Continued attention should focus on any follow-up clarification in formal wording, implementation practice, and certification workflow requirements.