GCT 5G, 4G LTE and NTN IoT Chipsets

GCT Semiconductor Holding, Inc. is a fabless designer and supplier of 5G and 4G LTE semiconductor solutions, listed on the NYSE as GCTS, with press releases datelined San Jose, California and a Korean-language site. Its system-on-chip products integrate RF, baseband modem and DSP functions and have powered CPEs, mobile hotspots, routers, M2M devices and smartphones for large wireless carriers.

The 5G GDM7275X is a Release 16/17 NR modem SoC for FR1 and FR2 with LTE, integrated baseband and two quad-core Cortex-A55 processors. The 4G GDM7243 family serves IoT and broadband devices, and GCT is extending it to satellite: it works with Iridium on an NB-IoT NTN chipset based on 3GPP Release 19, with Globalstar on its 4G chips, and with Skylo on chip and module certification. In January 2026 it licensed its 5G and 4G chipsets to a large satellite communications provider.

• GDM7275X 5G modem: Release 16/17 NR SoC for FR1 and FR2 with LTE support.
• GDM7243 4G family: LTE chips for IoT, hotspots, routers and M2M devices.
• NTN support: satellite NB-IoT work with Iridium, Globalstar and Skylo.
• Integrated SoC: RF, baseband modem and DSP on one chip.
• Chipset licensing: 5G and 4G chipset licensing to satellite communications providers.
• Ecosystem: module and device partners including Gemtek, Sercomm and WNC.

A Vietnamese networking equipment maker can design 5G CPE and routers on the GDM7275X. A tracker or IoT device maker can use GDM7243-based modules with satellite fallback for maritime or rural use. A local design house can co-develop satellite-capable devices with GCT and its module partners.

Device makers get modem chips that combine terrestrial 4G or 5G with satellite NTN options from one supplier. Highly integrated SoCs reduce component count in CPEs, routers and IoT devices. Partnerships with Iridium, Globalstar and Skylo give a path to satellite-capable products. Ecosystem partners include module and device makers such as Franklin Wireless, Gemtek, Sercomm and WNC.

Satellite operators and chipmakers are converging on 3GPP NTN so that ordinary cellular chips can reach satellites. Demand for 5G FWA CPE and routers keeps growing as operators expand 5G. Asian ODMs, including factories in Vietnam that build networking equipment, are key buyers of modem chipsets.

Listed on the NYSE as GCTS; press releases are datelined San Jose, California, and the company runs a Korean-language website. Partners include Verizon, Iridium, Globalstar, Sateliot, Skylo, 450 Connect and Samsung Foundry; also announced an IoT eSIM collaboration with Giesecke+Devrient in 2025.