Silicon Labs Receives World’s First PSA Level 4 Certification for Protection of Connected Devices

Silicon Labs announced that its Series 3 Secure Vault security subsystem on the SiXG301 SoC, the first SoC in its Series 3 multi-radio solution, has achieved the world's first PSA Level 4 certification. This achievement – the highest level recognized by PSA Certified – affirms Silicon Labs’ embedded trust credentials at the core of connected technology. PSA Certification is essential to meet upcoming regulatory cyber resilience compliance in every consumer electronics and smart home design. As hacks have increased in recent years, governments have introduced new security laws to protect consumers, introducing cybersecurity legal requirements that will soon be legally required in all connected devices. Governments around the globe have enacted new regulations – such as the EU’s Radio Equipment Directive (RED), the US Cyber Trust Mark, and Singapore’s Cybersecurity Labeling Scheme (CLS). In Europe, the EU Cyber Resilience Act (CRA) applies to all "products with digital elements" - chips, software, IP components, and devices, over their complete lifecycle. PSA Certified status can help manufacturers become regulation-ready and is particularly critical for all connected devices, from portable personal electronics to the smart home.

PSA Certified introduced the Level 4 certification and its two designations, iSE/SE for secure elements and ROT for Root of Trust, to address the rising complexity and sophistication of physical attacks on embedded devices. Unlike previous levels, Level 4 validates resilience against laser fault injection, side-channel attacks, microprobing, and voltage manipulation – threats once considered theoretical but now part of the evolving reality.

"Security isn’t just a feature – it’s foundational to everything we develop," says Matt Johnson, President and CEO of Silicon Labs. "Being the first to achieve PSA Level 4 certification is a powerful validation of our leadership in IoT security and our focus on accelerating IoT growth."
  Silicon Labs has consistently led the industry in achieving PSA milestones. Its MG21 SoC was the world’s first device to earn PSA Level 3 certification, establishing new benchmarks in protection against physical tampering and setting the stage for this next leap to Level 4. Silicon Labs SoCs were also the industry’s first to reach PSA Levels 1 and 2.

Silicon Labs collaborated with test solutions company Keysight Technologies and its evaluation labs to validate Secure Vault on Series 3 for PSA Level 4. The company's experts noted the seamless partnership with Silicon Labs’ engineering team, who demonstrated deep technical expertise and adaptability throughout the audit process.

The new SiMG301 Low Power Multiprotocol Wireless SoC belongs to Silicon Labs' next-generation Series 3 platform that further expands the range of available ultra-low power devices and modules for connected devices. Series 3 brings new levels of compute, security, RF performance, and power efficiency, and the SiMG301 is purpose-built for line-powered smart home devices, supporting Bluetooth, Matter, Thread, Zigbee, dynamic multiprotocol, and concurrent multiprotocol (CMP).
 
The multi-core device has an ARM Cortex-M33 running up to 150MHz for application development and dedicated cores for the radio and security engine. The Series 3 Secure Vault has been certified for PSA Certified Level 4, ensuring the highest level of attack resistance from PSA Certified, protecting both the data and the device. Memory options of up to 4MB Flash and 512kB RAM allow for more demanding applications including support to run both Zigbee and Matter over Thread at the same time on a single device, simplifying SKU management for the product manufacturer and ease of use for the end user.

The Series 3 Secure Vault and the SiXG301 SoC's resilience aren’t just about meeting today’s standards – it’s about anticipating future threats. The security subsystem and SoC were engineered to endure over a decade in the field, with industry-leading defenses against threats not yet commonplace. When combined with over-the-air firmware and software updates and real-time monitoring, Series 3 Secure Vault and the SiXG301 exemplify security as an ongoing lifecycle.

Silicon Labs’ holistic approach to security and expert guidance gives product development teams a head start on regulatory readiness, backed by independent lab validation. With the EU's RED regulations now in effect as of August 1, 2025, Silicon Labs' Secure Vault – when properly implemented – delivers the features needed for compliance.
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