ANATEL Tightens EMC & MCU Requirements for DC Fast Chargers in Brazil

ANATEL’s new technical notice imposes stricter EMC immunity and domestic MCU mandates on ≥60 kW DC fast charging modules entering Brazil — effective immediately as of 28 April 2026. Exporters, OEMs, and firmware developers in the EV charging supply chain must reassess compliance pathways and certification timelines.

Event Overview

On 28 April 2026, the Brazilian National Telecommunications Agency (ANATEL) issued Technical Notice No. 521. It mandates that all newly submitted DC fast charging modules rated at 60 kW or higher must: (1) pass enhanced electromagnetic compatibility (EMC) immunity testing per IEC 61000-4-3 and IEC 61000-4-6 at Level 4; (2) use a main control microcontroller unit (MCU) approved by ANATEL from a designated list of domestically recognized chips — including Huawei Hi3861 and Allwinner R329; and (3) submit the cryptographic hash value (e.g., SHA-256) of the final firmware binary to ANATEL’s official database for备案 (record-filing). The notice entered into force on the date of publication.

Which Subsectors Are Affected

Direct Exporters and OEMs

Chinese manufacturers exporting ≥60 kW DC fast chargers to Brazil face immediate re-certification requirements. Because the notice applies to all new submissions, previously certified models remain unaffected — but any design revision, firmware update, or new model launch after 28 April 2026 must comply. This directly delays time-to-market and increases test costs due to Level 4 EMC immunity validation, which exceeds typical commercial-grade requirements.

MCU Suppliers and Firmware Developers

Suppliers of non-listed MCUs — especially foreign-origin or generic ARM Cortex-M chips — are excluded from new ANATEL approvals unless added to the agency’s recognized domestic chip list. Firmware teams must now implement deterministic build processes to ensure reproducible binary outputs, enabling consistent hash generation for submission. Any post-submission firmware patch triggers re-filing — a procedural shift from prior practice.

Testing Laboratories and Certification Bodies

Labs accredited for ANATEL certification must verify their test capabilities against IEC 61000-4-3/4-6 Level 4 — notably higher field strengths (e.g., 20 V/m radiated, 10 V/m conducted) than standard Level 3. Capacity constraints may arise if multiple clients pursue parallel validation, potentially extending lead times for test scheduling and report issuance.

Supply Chain Integrators and System Assemblers

Companies integrating third-party power modules, cooling systems, or user interfaces into complete chargers must confirm upstream component compliance — especially MCU origin and firmware hash traceability. A single non-compliant subassembly invalidates the full system’s eligibility for new ANATEL registration.

What Enterprises and Practitioners Should Focus On — And How to Respond

Monitor official updates to the recognized MCU list and hash submission interface

ANATEL has not yet published a public portal or API for firmware hash submission. Enterprises should track ANATEL’s official communications (e.g., notices on anatel.gov.br) for technical specifications of acceptable hash algorithms, file naming conventions, and metadata fields required during备案.

Prioritize compliance review for models scheduled for new submission or revision in Q3–Q4 2026

Given the immediate effective date, any model planned for ANATEL application after 28 April 2026 must be evaluated for MCU eligibility and Level 4 EMC readiness. Early engagement with labs for pre-scan EMC testing — particularly radiated immunity in the 80 MHz–6 GHz range — is advisable to identify design-level fixes before formal validation.

Distinguish between policy signal and operational implementation

The notice establishes mandatory requirements, but enforcement mechanisms — such as audit frequency, hash verification depth (e.g., whether signed firmware signatures are also required), or penalties for hash mismatch — remain unspecified. Until clarified, enterprises should treat the hash filing as a strict procedural gate, not a symbolic formality.

Initiate cross-functional alignment across hardware, firmware, and regulatory teams

MCU selection, PCB layout (for EMC robustness), bootloader security, and CI/CD pipeline configuration must be jointly reviewed. For example, using an ANATEL-recognized MCU does not guarantee compliance if clock routing or power supply filtering fails Level 4 immunity — meaning hardware and firmware co-design is now essential.

Editorial Perspective / Industry Observation

Observably, this notice reflects ANATEL’s broader strategic pivot toward embedding local technology sovereignty criteria within telecom-adjacent infrastructure — extending beyond traditional radio equipment into EV charging systems. Analysis shows it is less a technical harmonization move and more a targeted industrial policy instrument: the explicit naming of Huawei and Allwinner chips signals intent to recognize specific domestic-capable platforms, not merely ‘Brazilian-made’ hardware. From an industry perspective, it is best understood not as an isolated compliance update, but as an early indicator of how emerging markets may increasingly layer national tech policy onto international EMC standards — turning certification into a dual-track process (technical + geopolitical).

Current evidence suggests this is already operational — not merely a signal. The immediate effective date, absence of transition periods, and binding nature of the MCU and hash requirements indicate enforceable obligations. However, the scope remains narrowly defined: only new submissions of ≥60 kW DC modules, excluding AC chargers, lower-power DC units, or legacy-certified products. That narrow focus makes sustained monitoring critical — especially for potential expansion to other power tiers or adjacent categories (e.g., energy storage inverters) in future notices.

Conclusion

This notice marks a material tightening of market access conditions for high-power EV charging infrastructure in Brazil. Its significance lies not in introducing novel EMC limits per se, but in coupling those limits with mandatory domestic MCU adoption and firmware traceability — effectively transforming regulatory approval into a multi-dimensional gate covering hardware provenance, software integrity, and electromagnetic resilience. Enterprises should interpret it as a concrete, actionable requirement — not a warning or proposal — and align engineering, procurement, and compliance functions accordingly.

Information Source

Main source: ANATEL Technical Notice No. 521, published 28 April 2026, available via the official ANATEL website (https://www.anatel.gov.br).
Points requiring ongoing observation: exact technical parameters of the hash submission portal, enforcement timeline for audits, and possible future extension to sub-60 kW modules or other EV infrastructure categories.