Gallium in 5G Networks: GaN Base Stations and GaAs Smartphone RF

Gallium Compounds in 5G at a Glance

What Role Does Gallium Play in 5G Networks?

Gallium serves two distinct functions in 5G: GaN power amplifiers generate the RF signal at base stations across sub-6 GHz and mmWave bands, while GaAs power amplifiers in smartphone RF front-end modules transmit user signals back to the network. GaN is used in 67% of 5G base stations globally - the majority of all deployed infrastructure.

5G's higher frequency bands (3.4-3.8 GHz sub-6 GHz; 24-43.5 GHz mmWave) require semiconductors that silicon cannot provide at useful power levels. At frequencies above approximately 3-4 GHz, silicon LDMOS - the technology that dominated 4G base stations - loses efficiency and gain at the power levels needed for commercial coverage. GaN maintains output power, efficiency, and thermal stability at these frequencies. GaAs handles the lower-power smartphone side with superior noise characteristics and integration density.

Why Do 5G Base Stations Use Gallium Nitride Power Amplifiers?

5G base stations use GaN because GaN provides 5x the power density of GaAs, operates efficiently above 3 GHz where 5G sub-6 bands sit, and sustains temperatures that would destroy LDMOS or GaAs devices. A single GaN module replaces multiple LDMOS modules, reducing the physical size of remote radio units mounted on antenna arrays while delivering equal or greater output power.

GaN's material properties explain the dominance. Gallium nitride has a bandgap of 3.4 eV - more than double GaAs at 1.42 eV - which translates to a higher breakdown voltage. Higher breakdown voltage means GaN transistors operate at supply voltages of 28-50V versus 12-28V for GaAs, producing more RF power per unit area. GaN also operates at junction temperatures up to approximately 800°C, reducing or eliminating active cooling requirements that older technologies needed at equivalent power levels.

How Efficient Are GaN Amplifiers in 5G Base Stations?

GaN power amplifiers in 5G massive MIMO base stations achieve 40%-43% power-added efficiency (PAE) in production modules, with well-designed research prototypes reaching 65%. For comparison, LDMOS achieved 46% PAE but only below 3 GHz - where 5G has minimal deployment. GaN operates at 35%-65% PAE across the 3.4-3.8 GHz band where most global 5G mid-band spectrum sits.

Mitsubishi Electric's production modules illustrate the trajectory from 2023 through 2025:

The 5G base station market reached USD 28.92 billion in 2024 and is growing at 37.2% CAGR through 2032 - a market where GaN efficiency directly controls operating cost for carriers deploying and running global networks.

How Many GaAs Chips Does a 5G Smartphone Contain?

A 5G smartphone contains 8-10 GaAs power amplifier chips in its RF front-end module (RFFE), compared to approximately 5 GaAs PAs in a 4G handset. This 60%-100% increase is driven by 5G's band proliferation: 5G devices support 50+ frequency bands simultaneously, each requiring dedicated amplification and switching circuits.

The RFFE sits between the baseband processor and the antenna. Its core components - power amplifiers, RF switches, filters (SAW/BAW), and low-noise amplifiers - integrate into modules roughly the size of a thumbnail. GaAs provides the power amplifier function, chosen for its low noise figure in receive mode, moderate efficiency in transmit mode, and proven integration with filter and switch components assembled into complete RFFE packages.

The RF front-end module market is projected to reach USD 26.9 billion by 2028. Qorvo and Skyworks Solutions collectively held over 55% of this market before their announced merger valued at approximately USD 22 billion in 2025 - a consolidation creating the dominant GaAs RFFE supplier for 5G handsets globally.

What Is Massive MIMO and How Does GaN Enable It?

Massive MIMO (Multiple-Input Multiple-Output) is a 5G antenna technology that uses 32 to 128 simultaneous transmit-receive antenna channels to focus radio beams at individual users rather than broadcasting in all directions. A 64T64R massive MIMO antenna requires 64 transmit power amplifiers - all of which use GaN in modern deployments - packed into a unit mounted on a cell tower.

GaN enables massive MIMO through three physical properties. First, GaN's 5x power density over GaAs means 64 amplifier modules fit in an antenna unit without exceeding weight or volume limits for tower mounting. Second, GaN's thermal tolerance eliminates individual heat sinks per module, reducing form factor further. Third, GaN's efficiency at 3.4-3.8 GHz produces the 8-16W per channel needed for practical outdoor coverage.

The beamforming function of massive MIMO - steering focused beams to tracked users - runs on digital signal processing, but the physical beam quality depends on the PA linearity and efficiency at each antenna element. GaN's smooth transition into compression (compared to LDMOS's abrupt saturation) allows amplifiers to operate closer to peak efficiency with acceptable linearity using digital predistortion techniques.

Huawei was the first major vendor to fully transition base station designs from LDMOS to GaN. Ericsson, Nokia, and Samsung followed. Key GaN substrate and PA suppliers to these vendors include Sumitomo Electric Device Innovation (SEDI, approximately 34% global GaN substrate market share), Wolfspeed (formerly Cree), Qorvo, MACOM, and Ampleon. NXP exited the 5G radio power amplifier market and closed its Arizona radio power fab.

What Is GaN-on-Silicon and How Does It Change 5G Costs?

GaN-on-silicon (GaN-on-Si) deposits gallium nitride on silicon substrates instead of the expensive silicon carbide (SiC) used in conventional GaN RF devices. Silicon wafers cost 5-10x less than SiC wafers, and production scales to 8-inch and eventually 12-inch wafers using existing CMOS manufacturing lines. GaN-on-Si base station PA modules could grow from low single-digit market share today to over 10% of base station PAs by 2029.

Infineon Technologies entered the telecom GaN market in 2023 with GaN-on-Si PA modules fabricated on 8-inch wafers - the first major European semiconductor company to bring cost-competitive GaN to 5G infrastructure at scale. Imec demonstrated GaN-on-Si MISHEMT devices with performance suitable for 5G-Advanced base stations, publishing results on scaling the technology toward 6G.

Which Companies Supply Gallium-Based Components for 5G?

Six companies lead the supply of gallium-based 5G components across substrate, chip, and module tiers: Sumitomo Electric Device Innovation (GaN substrates), Wolfspeed (GaN wafers and chips), Qorvo (GaN base station PAs, GaAs RFFE), Skyworks (GaAs RFFE), Mitsubishi Electric (GaN PAMs for massive MIMO), and Infineon (GaN-on-Si modules). Together with MACOM, Ampleon, and Azur Space, these companies control the majority of gallium-based RF component supply to the global 5G buildout.

Sumitomo Electric Device Innovation holds approximately 34% of the global GaN substrate market - making it the single largest source of the wafer material on which most GaN base station chips are fabricated. The RF GaN device market reached USD 1.34 billion in 2023 and is projected to grow to USD 6.45 billion by 2030, at a CAGR of 21.7%. Telecommunications infrastructure accounts for approximately 40% of total RF GaN device revenue - the largest single end market.

For upstream gallium supply feeding these manufacturers, see the gallium producers page and the gallium refining page, which covers the 6N purity grade required for compound semiconductor wafer growth.

How Does China's Gallium Supply Dominance Affect 5G Infrastructure?

China produces 98% of global low-purity gallium and supplied 95% of U.S. gallium imports before 2024. Every GaN base station module and GaAs smartphone chip depends on this supply chain. China's December 2024 ban on gallium exports to the United States cut the primary supply route for U.S. 5G equipment manufacturers and their component suppliers. Gallium sold outside China was trading at nearly double the Chinese domestic price by early 2024.

Each 5G base station contains 8-12 specialized GaAs RF integrated circuits in addition to its GaN power amplifier modules. With 5+ million base stations deployed globally and continued rollout at pace, the annual gallium demand from 5G infrastructure alone is substantial. A complete halt of Chinese gallium exports was estimated to reduce U.S. GDP by USD 3.1-3.4 billion, primarily through semiconductor supply disruption affecting equipment manufacturing and carrier network buildouts.

The China export ban analysis page covers the policy timeline in full detail. The gallium supply chain risks page quantifies Western production capacity versus demand across telecom, defense, and other sectors.

What Role Will Gallium Play in 6G Networks?

6G networks - targeting 2030 deployment with data rates exceeding 1 Tbit/s and frequencies above 100 GHz - will require GaN to perform at efficiency levels current base stations cannot reach. In March 2026, Soitec and NTU Singapore demonstrated GaN devices exceeding 50% PAE at FR3 frequencies (7-24 GHz) - the band likely to anchor 6G sub-THz coverage - surpassing anything in 5G production today.

Imec published GaN-on-Si MISHEMT transistor results in 2025 targeting 5G-Advanced and 6G base station applications, demonstrating that GaN-on-Si can reach the performance tier previously reserved for GaN-on-SiC. At frequencies above 100 GHz, GaN competes with indium phosphide (InP) - with GaN holding a power output advantage and InP holding a noise figure advantage for receiver applications.

The GaN RF device market - already at USD 1.34 billion in 2023 on 5G demand - projects to USD 6.45 billion by 2030 partly on continued 5G buildout and partly on beginning 6G research procurement. See the gallium price history page and the gallium investing overview for how these demand projections affect the underlying metal market.

Gallium in 5G: Quick Reference

5G represents gallium's largest growing demand sector in consumer and infrastructure electronics. The 60%-100% increase in GaAs chips per smartphone multiplied across billions of 5G handsets, combined with GaN in 67% of 5 million-plus base stations, establishes telecommunications as a demand driver that will grow through the decade as 5G penetration increases and 6G buildout begins. Supply chain security - with China controlling 98% of gallium production - is the defining constraint on how fast Western 5G and 6G infrastructure can scale.