GaN-on-SiC RF Transistors for Military Radar and EW, The Supply Map

GaN-on-SiC RF Transistors for Military Radar and EW

Gallium nitride on silicon carbide (GaN-on-SiC) high-electron-mobility transistors (HEMTs) used as the high-power RF amplification stage in active electronically scanned array (AESA) radar, electronic warfare (EW) jamming and detection systems, and directed energy weapons. GaN-on-SiC offers 5-10× higher power density than GaAs, enabling radar with longer range and EW systems with higher jamming power. Used in: F-35 APG-81 AESA radar (Northrop Grumman), F-22 APG-77 (Northrop Grumman), Aegis radar upgrades, Army SPY-6 radar. Fab sources: Wolfspeed (Marcy NY), WIN Semiconductors (Taiwan), RFMD/Qorvo. DoD has funded domestic GaN-on-SiC foundry capacity specifically due to Taiwan concentration risk.

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1 company produce gan-on-sic rf transistors for military radar and ew.

WIN Semiconductors Corp.

HQ TW20% share

WIN Semiconductors Corp. (Taoyuan Science Park, Taiwan; TWSE: 3105; ~NT$30B revenue) is the world's largest pure-play compound semiconductor foundry — specializing in GaAs (gallium arsenide) and GaN (gallium nitride) wafer fabrication on behalf of fabless and IDM clients. WIN Semiconductors is the dominant foundry partner for Broadcom's smartphone RF content: WIN produces an estimated 80%+ of the global smartphone GaAs power amplifier wafers, making it the single most critical facility in the smartphone RF supply chain. WIN also manufactures GaAs and GaN wafers for Qorvo, Skyworks, MACOM, and dozens of smaller compound semiconductor design companies. The company's Taoyuan facilities operate GaAs HBT (heterojunction bipolar transistor) processes on 6-inch and 8-inch wafers — the dominant technology for smartphone power amplifiers. GaAs HBT is preferred for smartphone PAs because it delivers high linearity and power efficiency at the low supply voltages in mobile devices. WIN's Taiwan concentration creates a single-point-of-failure risk: a Taiwan Strait contingency that disrupted WIN operations would interrupt the compound semiconductor supply chain for virtually all major smartphone makers within weeks.