Infineon HiRel power semiconductors are once again heading into deep space. On 31 August 2026, the Nancy Grace Roman Space Telescope lifted off from Kennedy Space Center in Florida, carrying radiation-hardened HiRel power devices from Infineon Technologies AG and marking the successful start of NASA’s next flagship space observatory mission.
The spacecraft is now cruising toward the second Sun-Earth Lagrange point, known as L2, a gravitationally stable parking spot more than 1.5 million kilometres from Earth. It is the same orbital neighbourhood occupied by the James Webb Space Telescope, offering the observatory an unobstructed view of a wide swath of sky plus the stable thermal and gravitational conditions its ambitious scientific programme demands.
A Decade-Long Mission With No Second Chances
Unlike hardware in low Earth orbit, Roman will operate at L2 for up to a decade with absolutely no possibility of maintenance, repair or servicing. Every subsystem must work flawlessly from day one and keep working for years in a harsh radiation environment. That requirement shapes every component choice on board, including the power electronics that keep the telescope’s instruments, detectors and data systems alive around the clock.
Named after NASA’s pioneering astronomer Nancy Grace Roman, the observatory carries a 2.4-metre primary mirror, the same size as Hubble’s, paired with a Wide Field Instrument that surveys the sky hundreds of times faster than Hubble, plus a Coronagraph Instrument for direct imaging of exoplanets. Together they will probe dark energy, galactic structure, exoplanet microlensing and the evolution of the universe, generating an unprecedented torrent of science data.
Why Radiation Hardening Matters Beyond Earth’s Magnetic Field
Close to home, Earth’s protective magnetic field deflects most high-energy particles. Beyond it, cosmic rays and solar particles strike electronic components unimpeded, potentially causing permanent damage or outright destruction that can end a mission in an instant. Infineon’s radiation-hardened technology tackles these failure mechanisms at the root. Instead of relying on passive shielding, the company builds semiconductor architectures that are radiation-resistant by design, allowing devices to absorb total ionizing dose and survive single event effects without losing performance.
The Infineon HiRel Power Semiconductors Aboard the Roman Telescope
The HiRel portfolio integrated into Roman includes radiation-hardened power semiconductor components qualified to MIL-PRF standards, with full Total Ionizing Dose (TID) and Single Event Effects (SEE) characterization. These qualifications deliver the performance margins required for sustained operation at L2.
Reliability is critical to the mission’s operational cadence. Roman’s onboard systems will downlink approximately 1.4 terabytes of raw science data per day to ground stations in New Mexico, Australia and Japan, the highest daily data volume of any NASA astrophysics mission to date. Continuous, stable power delivery to the telescope’s instruments and data systems is the prerequisite that makes this cadence possible across the full duration of the mission.
GaN Technology: Lower Losses, Higher Power Density
Infineon’s HiRel product range spans radiation-hardened silicon power MOSFETs, gallium nitride (GaN) transistors, gate drivers, solid-state relays and diodes, all backed by in-house fabrication, robust radiation testing capabilities and guaranteed long-term product availability.
At the leading edge of this portfolio sits Infineon’s JANS-qualified rad-hard 100 V GaN transistor, the first and only internally manufactured radiation-hardened GaN transistor on the market qualified per MIL-PRF-19500. GaN enables lower switching losses, higher power density and higher switching frequencies. In practical terms that means reduced power losses, smaller magnetic components and measurable weight and volume savings at system level, a decisive advantage in space applications where every gram counts.
A Space Heritage Stretching Back to the 1970s
The Roman mission adds another chapter to Infineon’s space heritage, which stretches back to the 1970s. Across five decades the company has supported hundreds of space missions, including navigation satellites, the International Space Station and NASA’s Artemis programme, with rad-hard components that have collectively travelled more than 20 billion kilometres from Earth. That track record explains why space agencies and prime contractors continue to specify Infineon HiRel power semiconductors for flagship missions.
What Infineon Says About the Roman Launch
Mike Mills, Senior Vice President and General Manager HiRel at Infineon, described the launch as the beginning of one of the most scientifically productive space observatory missions ever undertaken, with Infineon’s HiRel technology on board from day one. With no servicing possible at L2, he stressed, power technology must work flawlessly from the start and keep working, and space programmes need partners they can rely on for decades. The selection of Infineon’s HiRel devices for Roman, he added, reflects the qualification depth and mission heritage the industry demands from a strategic technology partner.
Frequently Asked Questions (FAQs)
What are Infineon HiRel power semiconductors?
They are radiation-hardened power components, including silicon power MOSFETs, GaN transistors, gate drivers, solid-state relays and diodes, engineered to operate reliably in the harsh radiation environments of space.
Where will the Roman Space Telescope operate?
At the second Sun-Earth Lagrange point (L2), more than 1.5 million kilometres from Earth, in the same orbital position as the James Webb Space Telescope.
How much science data will Roman return?
Around 1.4 terabytes of raw science data per day, downlinked to ground stations in New Mexico, Australia and Japan, the highest data volume of any NASA astrophysics mission so far.
Why is GaN important for space power systems?
GaN transistors deliver lower switching losses, higher power density and higher switching frequencies, reducing power losses and shrinking magnetic components, saving weight and volume on spacecraft where every gram matters.
Final Thoughts: Powering the Next Era of Discovery
The successful launch of the Nancy Grace Roman Space Telescope is a milestone for astronomy and for the semiconductor industry that quietly makes such missions possible. With radiation-hardened HiRel power devices on board, Infineon’s five-decade space heritage now extends to NASA’s newest flagship observatory, promising a decade of discovery from L2. Engineers and enthusiasts can explore the HiRel radiation-hardened power portfolio at www.infineon.com/hirel, and readers can find more space-grade semiconductor coverage right here on aarokatech.com.
