ANATEL’s New EMC Rule for DC Fast Chargers in Brazil

Brazil’s National Telecommunications Agency (ANATEL) has introduced a new electromagnetic compatibility (EMC) immunity requirement for DC fast charging modules, effective 1 October 2026. This regulation directly affects manufacturers, exporters, and distributors of EV charging equipment targeting the Brazilian and broader Latin American markets — particularly those relying on imported or non-certified microcontroller units (MCUs).

Event Overview

On 26 April 2026, ANATEL issued Portaria No. 112/2026, mandating that all DC fast charging modules submitted for ANATEL certification after 1 October 2026 must integrate an MCU with built-in EMC immunity self-check functionality. Crucially, the MCU must hold INMETRO’s local certification — a requirement currently met by only two Chinese MCU suppliers, both specializing in automotive-grade products.

Which Subsectors Are Affected

Direct Exporters & OEMs of DC Fast Charging Modules

These companies face immediate compliance risk: modules without an INMETRO-certified MCU will fail ANATEL certification after the deadline. Impact includes delayed market entry, potential re-design cycles, and increased BOM costs due to MCU substitution or firmware adaptation.

Supply Chain & Component Sourcing Firms

Firms responsible for MCU procurement must now verify not only technical compatibility but also the regulatory status of each MCU variant under INMETRO. The narrow pool of certified suppliers introduces supply concentration risk and may constrain lead times ahead of Q4 2026.

Distributors & Channel Partners in Latin America

Latin American distributors are required to validate upstream supplier compliance before accepting shipments. Non-compliant inventory arriving post-October 2026 may be denied customs clearance — triggering storage fees, rework, or rejection at the port of entry.

Contract Manufacturers & EMS Providers

EMS providers assembling DC fast chargers for global brands must confirm MCU sourcing documentation and update assembly work instructions to include verification steps for INMETRO certification marks and firmware self-test validation during final test.

What Relevant Companies or Practitioners Should Focus On — and How to Respond Now

Monitor official updates from ANATEL and INMETRO on implementation guidance

While Portaria No. 112/2026 is published, technical annexes detailing test methods, acceptable self-check architectures, and transition provisions remain pending. Stakeholders should track ANATEL’s official notices and INMETRO’s certification bulletins for clarifications before finalizing design or procurement decisions.

Evaluate MCU supply chain alignment — specifically for certified automotive-grade parts

Only two Chinese MCU vendors currently meet the INMETRO requirement, and both serve the automotive sector. Analysis来看, this signals a de facto preference for functional safety–oriented MCU architectures over generic industrial variants. Companies should audit existing bill-of-materials to identify non-compliant MCUs and assess feasibility of switching to one of the two certified sources — including qualification timelines and minimum order volumes.

Distinguish between policy signal and operational readiness

The rule takes effect in October 2026, but ANATEL certification applications filed before that date may still be processed under prior requirements. From industry角度看, early submission — where technically feasible — could provide a window to clear legacy designs. However, this depends on ANATEL’s acceptance of transitional applications, which remains unconfirmed.

Prepare documentation and internal validation protocols ahead of certification

Manufacturers must now embed and demonstrate MCU-based EMC self-check functionality — including fault logging, real-time monitoring, and fail-safe response logic. Current more suitable understanding is that this goes beyond standard IEC/EN 61000-4 immunity testing; it requires firmware-level integration and traceable verification records. Teams should begin drafting test plans and updating quality management system documentation accordingly.

Editorial Perspective / Industry Observation

This regulation is better understood as a targeted technical barrier — not a broad trade restriction. Observation来看, it reflects Brazil’s increasing emphasis on embedded resilience in critical infrastructure components, especially as EV adoption accelerates. It is less about protectionism and more about harmonizing local certification expectations with evolving international best practices in functional safety and EMC robustness. However, the narrow vendor base for compliant MCUs means the practical impact is currently supply-constrained rather than purely technical. Industry should treat this as a medium-term structural shift requiring cross-functional coordination across R&D, procurement, and regulatory affairs — not just a one-time compliance checkbox.

In summary, ANATEL’s new EMC requirement introduces a concrete, enforceable condition for market access in Brazil — with cascading implications across the DC fast charging value chain. It does not represent a sudden policy reversal, but rather a calibrated step toward higher assurance in power electronics interoperability and reliability. For stakeholders, the current priority is not speculation about future expansions, but precise mapping of MCU dependencies and proactive engagement with certified suppliers and notified bodies.

Source: ANATEL Portaria No. 112/2026, published 26 April 2026. Certification status of Chinese MCU vendors confirmed via publicly listed INMETRO certification registry (as of May 2026). Note: Technical implementation guidelines and transitional arrangements remain pending and require ongoing observation.