Davis, California , 18 November 2025 , The Connectivity Standards Alliance (Alliance) today announced the release of Zigbee 4.0 and the new brand Suzy for Zigbee’s sub-GHz feature, two major milestones in advancing the foundation of secure, interoperable, and scalable IoT connectivity with a range of optional features that enable product manufacturers to choose the specific set of features that best suits their product use case and needs. Together, these innovations mark the next evolution of ZigBee technology, building on decades of proven performance to deliver greater range, reliability and security over global networks.
Strengthening security, range and interoperability
Zigbee 4.0 lays the groundwork for harmonizing traditional Zigbee and smart energy devices, providing greater interoperability across universal networks. This release simplifies authentication processes and supports better information exchange, creating a more complete smart home solution. Comprehensive and proactive security updates in line with evolving international security standards apply cryptographic agility and additional mechanisms to protect the network. Extending its capabilities beyond the 2.4GHz band, Zigbee 4.0 introduces support for the European 800 MHz and North American 900 MHz PHY, providing increased signal strength, range, and coverage. Fully backward compatible with Zigbee 3.0 and Smart Energy, it ensures continuity with over a billion Zigbee devices already deployed worldwide while offering improvements in network stability, user experience and device commissioning in dense networks.
Providing significant security enhancements in line with emerging global standards, the latest release solidifies Zigbee’s position as a trusted solution for secure, modern connectivity. Advanced capabilities such as Dynamic Link Key, Device Interview, and Smart Energy Authentication Level Control provide greater control and flexibility over connected networks. These capabilities strengthen device authentication, enable selective communications based on security levels, and ensure that only trusted devices join the network. New tools like Restricted Mode, Secure Channel, PAN ID change and Trust Center Swap Out provide better flexibility and management for the ecosystem and installers by increasing security, allowing efficient Trust Center replacement and preventing unauthorized network changes.
With advanced frame counter synchronization, Zigbee 4.0 prevents replay attacks and synchronizes accurate message validation between endpoints. Strong improvements such as standardized network-level retries, more reliable data polling for sleepy end devices, and expanded use of APS acknowledgments increase overall network performance and reduce message loss. Features such as formal guardian selection, unique link key monitoring and Trust Center connectivity improve network resiliency, ensuring devices maintain secure connections, can reconnect when needed and can operate even in complex network environments.
Zigbee 4.0 is designed to simplify and strengthen device interoperability, while enhancing both usability and scalability. Through Zigbee Direct, users can onboard and control devices via Bluetooth Low Energy (BLE) without any hub. Batch commissioning enables efficient, simultaneous setup of multiple devices, simplifying residential and commercial deployments. Additionally, sleep-to-sleep communication using Coordinated Sample Listening (CSL) allows direct, low-power exchanges between devices, optimizing energy and further extending battery life. Collectively, these advancements establish Zigbee 4.0 as a forward-looking standard that will continue to evolve with industry needs and future market requirements.
Introducing Suzie: Expanding Connectivity Through Long Range Mesh Networking
With Zigbee 4.0, the Alliance introduces Suzi, a new brand for standards-based wireless technology that increases the reach and reliability of IoT connectivity through long-range, sub-gigahertz mesh networking.
Built on the proven Zigbee network layer, Suzi combines long-range performance, low power consumption and multi-vendor interoperability to unlock new opportunities in residential, commercial and industrial applications. From connecting outdoor living spaces to enabling large-scale networks in buildings and cities, Suzie delivers robust, efficient communications in environments demanding extended coverage and minimal interference.
Adhering to the same strong security principles that define all Alliance technologies, Suzy aligns with international standards to ensure a secure and reliable ecosystem. Its framework gives developers, manufacturers, and consumers the freedom to create and deploy interoperable devices from a global ecosystem of trusted suppliers.
The SUJI certification program is planned to launch in the first half of 2026, helping manufacturers begin certifying products that bring the benefits of long-range, low-power mesh networking to a connected world.
A connected future, built on proven foundations
Together, Zigbee 4.0 and Suzie demonstrate the alliance’s dedication to strengthening the global IoT network through open innovation and collective progress. Combining advanced security, simplified onboarding and extended range, these new features expand the reach and flexibility of the smart ecosystem, making secure, intelligent connectivity accessible everywhere.
learn more about ZigBee And semolina. Developers interested in learning more about these enhancements can access the Zigbee 4.0 specification documents here.
- Zigbee Base Device Behavior v3.1 Specification
- Zigbee Core R23.2 Specification
- Zigbee Device Type Library v1.0 Specification
- Zigbee Direct v1.1 Specification
About Connectivity Standards Alliance
The Connectivity Standards Alliance is the foundation and future of the Internet of Things (IoT). Founded in 2002, its broad global membership collaborates to create and develop universal open standards for products that change the way we live, work, and play. With the deep and diverse expertise of its members, robust certification programs, and a full suite of open IoT solutions, the alliance is leading the movement toward a more intuitive, imaginative, and useful world.
The Connectivity Standards Alliance Board of Directors includes Allegion, Amazon, Apple, ASSA ABLOY, Bosch, CableLabs, Comcast, Espressif, Eve by ABB, Fortune Brands, Google, Haier, Huawei, IKEA, Infineon Technologies AG, Lederson, LeGrand, LG Electronics, Lutron Electronics, Midea, Nordic Semiconductor, Executives from NXP Semiconductor, Oppo are involved. Resideo Technologies, Samsung Electronics, Schneider Electric, Siemens, Signify (Philips Hue and WiZ), Silicon Labs, Somfi, STMicroelectronics, Tuya, and Verizon.
Learn more about the alliance at www.csa-iot.org; And follow us: xFacebook and LinkedIn.