GaN HEMT: A Game-Changer for PoE Switches
News & Updates
December 16, 2025
GaN HEMT: A Game-Changer for PoE Switches
Amid the exponential growth of data traffic and the rapid expansion of 5G technology, PoE (Power over Ethernet) switches are widely deployed in enterprise networks and 5G edge sites. However, they are now facing increasing performance challenges.
Traditional silicon-based devices, constrained by limitations in efficiency, thermal performance, and size, are hindering further advancement. In contrast, GaN HEMT technology, with its superior material properties, is unlocking new opportunities for PoE switch innovation.
This article explores the applications and key advantages of GaN HEMT in PoE switches.
Challenges of Silicon-Based PoE Switches
As power demand continues to rise, the limitations of conventional silicon devices become more pronounced.
For example, in an industrial-grade 48-port PoE switch, where some ports deliver 90W (802.3bt) and others 30W, the total system power can reach up to 2000W.
(1) Low Efficiency
Silicon has relatively low electron mobility, resulting in higher switching losses at high frequencies.
In typical PoE applications, silicon-based devices struggle to exceed ~92% efficiency, leading to significant energy loss, higher operating costs, and reduced alignment with energy-efficiency goals.
(2) Thermal Management Challenges
High-power PoE switches generate substantial heat when using silicon devices.
To maintain reliability, systems require complex and costly cooling solutions and larger physical footprints. Insufficient thermal management can result in performance degradation or failure.
(3) Size Constraints
To support multi-port, high-power output, silicon-based designs often rely on stacked architectures, increasing system size.
This creates deployment challenges in space-constrained environments, such as enterprise wiring closets and compact 5G base stations.
GaN HEMT: The Ideal Solution for PoE Switches
As a leading wide-bandgap semiconductor technology, GaN HEMT aligns perfectly with evolving PoE requirements.
GaN offers 10× higher electron mobility than silicon, enabling operation at much higher switching frequencies (up to 2 MHz and beyond), smaller power modules, as well as higher power conversion efficiency.
GaN HEMT features higher breakdown field than silicon, their operating temperature range from -55°C to +150°C.
For example, THINKANTECH's 700V GaN HEMT devices can withstand breakdown voltages exceeding 900V, offering greater tolerance to voltage fluctuations, stable operation in high-temperature environments, and reduced need for complex cooling systems.
Applicable THINKANTECH GaN models include:
X3G6515A5 / X3G6516B5 / X3G6522A5 / X3G6515B8
Key Advantages of GaN HEMT in PoE Applications
(1) Significant Efficiency Improvement
In AC-DC conversion (e.g., 220VAC to 48VDC), efficiency improves from ~92% (silicon) to ~97% (GaN). For a medium-sized enterprise using two 48-port PoE switches, this can save over 1,100 kWh annually, resulting in substantial cost savings.
(2) Support for High-Power PoE++
With increasing demand for high-power devices, PoE++ (90W+) is becoming mainstream.
GaN HEMT enables stable high-power delivery and support for devices such as HD surveillance cameras and high-power wireless access points
(3) Compact System Design
GaN devices are up to 70% smaller than silicon counterparts, enabling higher PCB integration, reduced system size and weight, and easier deployment in constrained environments
Application Scenarios
(1) Enterprise PoE Switches
Enterprise networks require flexible networking (multi-branch, VLAN segmentation), high security (MACsec, IPsec acceleration), and high port density and power delivery.
GaN enables:
Higher efficiency power modules Lower heat generation Reduced cooling and maintenance costs Improved long-term reliability
Example:
Cisco Catalyst 9000X series adopts GaN power modules, achieving 40% reduction in thickness, support for 90W PoE++, and improved space efficiency.
(2) 5G Base Stations & Edge Sites
These environments require support for mmWave frequencies (24–100 GHz), strong EMI resistance, compact and rugged designs, and high efficiency to reduce operational costs.
GaN HEMT delivers excellent high-frequency performance, strong radiation resistance, compact size and simplified cooling, and wide operating temperature range.
In power modules, GaN enables efficient DC-DC conversion and supports high-power PoE++ for cameras and IoT devices.
For example, Huawei’s PowerStar 2.0 solution improves energy efficiency by 20% using GaN devices.
Market Status & Challenges
Major vendors have begun adopting GaN:
Huawei, H3C: GaN-enabled prototypes Dell, Arista: Mass production of GaN data center switches (including PoE models)
Key Challenges of adopting GaN include
(1) Cost
8-inch GaN wafers cost ~4× more than silicon Costs are decreasing (~15% annually) as production scales
(2) Reliability (Early Stage Issues)
Early devices suffered from dynamic Rds(on) degradation New p-GaN gate technologies extend device lifetime beyond 1 million hours
THINKANTECH GaN devices have passed industrial-grade reliability testing, ensuring stable PoE operation.
(3) Ecosystem Maturity
Design tools, thermal solutions, and supply chains still evolving Industry-wide collaboration is required
China's 14th Five-Year Plan has prioritized wide-bandgap semiconductors, accelerating ecosystem development.
Future Outlook
With the rise of Wi-Fi 7, power consumption per AP is exceeding 40W, increasing demand for 802.3at/bt support, higher power density, and greater efficiency.
At the same time, new trends including Fanless designs and low-power systems, silent thermal solutions are emerging
Conclusion
The advancement of GaN HEMT is not just a technological upgrade, it represents a fundamental transformation in PoE switch design.
As costs decline, reliability improves, and the ecosystem matures, GaN is poised to reshape the PoE switch landscape and enable the next generation of network infrastructure.
Discussion
What do you think?
What market share will GaN HEMT achieve in the PoE switch market over the next 5 years?
Feel free to share your thoughts!
About THINKANTECH Technology
THINKANTECH Technology is a high-tech enterprise specializing in the design and development of wide-bandgap power semiconductor devices and modules. Founded by experts in power semiconductors and experienced professionals from the power electronics industry, as well as a team of young entrepreneurial specialists, the company has remained committed to the R&D and commercialization of GaN devices, SiC MOSFETs, Si MOSFETs, IGBTs, as well as SiC and IGBT modules. Our products are widely used in consumer electronics, photovoltaics, energy storage, and automotive power electronics, earning strong market recognition.
Awards and Recognition
Thanks to its innovation capability and market performance, THINKANTECH has received multiple honors, including:
2022 Emerging Power Device Brand Award from 21Dianyuan Inclusion in “Most Valuable Semiconductor Investment Companies” by ijiwei in 2022 Recognition as an Above-Scale Enterprise in 2022
In 2023, THINKANTECH achieved another milestone year, receiving:
Aurora Award for Third-Generation Semiconductors Top 10 GaN Power Device Companies in China Outstanding SiC Power Device Award National Technology-Based SME (2023)
