Solving the Stratospheric Reliability Gap for Modern Military Aviation

The transition toward More Electric Aircraft (MEA)—replacing heavy hydraulic systems with lightweight electric subsystems—has hit a hardware bottleneck.

To cut weight and wiring, design engineers at prime contractors like Safran and Northrup Grumman are moving mission-critical hardware—and the silicon inside—out of protected avionics bays. Instead, they are bolting them directly to the systems they govern: engine casings, wing actuators, and airframes.

For next-generation Military Jets, Collaborative Combat Aircraft (CCA), and high-altitude Unmanned Aerial Vehicles (UAVs), this exposes commercial silicon to a lethal dual-threat: extreme temperature swings (-55°C to +125°C+) and severe atmospheric radiation.

The aerospace and defense industry is currently stuck in a false dichotomy:

• Paying for overkill space-grade silicon; or

• Forcing standard, off-the-shelf parts into environments they weren't built for.

It is time for a third path to fill this industry gap—one that is more affordable than radiation-hardened microelectronics, more reliable than risky, up-screened components, and far cheaper than the lengthy software development required to "babysit" vulnerable hardware.

The Operational Threat: Soft Error Rate (SER)

While long-term radiation degradation, measured as Total Ionizing Dose (TID), is a predictable wear-out mechanism, the immediate, catastrophic threat to a tactical jet or drone is the Soft Error Rate (SER). It is the ultimate differentiator between true reliability and risky commercial workarounds.

What Exactly is a Soft Error?

• Technical Reality: A Soft Error, or Single Event Upset (SEU), is a transient fault. It happens when high-energy atmospheric radiation—typically a neutron—strikes the chip, flipping a memory bit or altering a signal without physically breaking the silicon.

• Mission Impact: This creates a "ghost" in the system—a garbage value in a flight control loop, a forced system reboot, or an uncommanded hard-over maneuver sent to a flight surface.

The Danger of the Pfotzer Maximum

Operating between 40,000 and 60,000 feet places tactical platforms directly in the Pfotzer Maximum—where atmospheric neutron radiation is densest. A TID failure might degrade a drone over ten years, but a single Soft Error can create havoc with a CCA today.

The Trap of "Up-Screened" COTS

Many aerospace, aviation, and avionics  - both defense and commercial – suppliers try to survive these altitudes by "up-screening" commercial chips—otherwise known as Commercial Off-The-Shelf (COTS) chips. But up-screening only tests if a chip might survive temperature extremes. It does very little to prevent radiation-induced bit flips. The silicon's commercial transistor geometry remains highly vulnerable to SER.

To mitigate this hardware vulnerability, engineers are forced to pay the Software Tax. They must write millions of lines of Triple Modular Redundancy (TMR) code to constantly check for and correct these errors. This burns CPU cycles, introduces latency, and makes DO-178C safety certifications incredibly complex and expensive.

Crushing Bit Flips: Radiation Tolerance Built into the Silicon

Vorago’s Radiation Tolerant by Design (RTBD) architecture integrates high-reliability protection directly into the silicon. This approach virtually eliminates Soft Errors (or bit flips) at a fraction of the cost of traditional space-grade components.

Rather than attempting to "patch" vulnerable commercial silicon, we engineer our RTBD microcontrollers from the ground up. They utilize the same intelligent implementation and Radiation Hardened by Process (RHBP) techniques as our flagship space-grade MCUs - minus the HARDSIL® technology.

By making protection against high-energy particles and SEUs native to the hardware, our MCUs comfortably achieve a Total Ionizing Dose (TID) tolerance of 30 krad(Si). They are also engineered for targeted immunity against Single-Event Latch-up (SEL)—a catastrophic, radiation-induced short circuit—withstanding heavy particle strikes with a Linear Energy Transfer (LET) exceeding 60. Because this deep-level resilience is built directly into the chip’s foundation, Vorago’s RTBD microcontrollers are exact drop-in replacements, remaining 100% pin-to-pin, software, and electrically compatible with their premium space grade HARDSIL counterparts.

Our Sales and Engineering teams are available for deep-dive discussions on how our built-in radiation and temperature protection ensures mission success. They will demonstrate why this RTBD foundational approach is vastly superior to the risks of "upscreened" COTS components or the heavy overhead of expensive software-based error correction.

Vorago’s Unified "Twin Chips" DNA

How is this high-reliability, rad-tolerance performance possible without HARDSIL?

It stems from Vorago’s unified “Twin Chips” silicon strategy. We engineer paired sets of rad-hard and rad-tolerant microcontrollers that share the exact same foundational design heritage—identical silicon DNA, design databases, and Arm® cores. By unifying the architecture from the ground up, Vorago virtually eliminates the massive aerospace "Redesign Tax."

Here are the first twin chips to illustrate how we’ve doubled the number of products, giving customers more choice across a multiple price points.

VA4 Series (Arm® Cortex®-M4)

• Rad-Tolerant MCU (VA42630): Purpose-built for Low Earth Orbit (LEO) atmospheric flight. Protected by Vorago’s unique RTBD architecture, it virtually eliminates Soft Errors (SER), targets robust immunity against bit flips with a Single Event Latch-up (SEL) immunity to a Linear Energy Transfer (LET) of >60, and delivers ~30 krad(Si) cumulative strike protection (TID)—with a 75% cost savings compared to its hard counterpart.

• Rad-Hard MCU (VA41630): Functionally identical to its rad-tolerant twin, the space-grade version is built for 300+ krad(Si) environments, protecting against the most extreme radiation and temperatures in orbit with >110 SEL immunity to a LET.

VA5 Series (Arm® Cortex®-M55)

• Rad-Tolerant Dual-Core MCU (VA54230): Operating 2x faster and 5x more capable than the VA4, this dual-core MCU delivers robust control for autonomous CCAs. It virtually eliminates Soft Errors, targets >60 SEL immunity to LET to prevent destructive system lock-ups, and features ~30 krad(Si) TID protection—with 75% cost savings compared to its rad-hard counterpart.

• Rad-Hard MCU (VA53230): Functionally identical to its rad-tolerant twin, this space-grade version is built for 300+ krad(Si) environments and delivers maximum SEL immunity to a LET of >110.

Because rad-hard and rad-tol "Twin Chips" are 100% pin-to-pin hardware, software, and electrically compatible, an engineer can design a flight controller for a wingman drone using the affordable RTBD chip, and port that exact design to a space-based satellite using the Radiation Hardened by Process (RHBP) twin—with zero code changes. This level of compatibility is a breakthrough not only in fast scalability, but also in cost and labor savings.

Conclusion

For the designers of next-gen military platforms, the goal is to increase reliability while decreasing weight and software complexity. Relying on "software-fixed" silicon in the Pfotzer Maximum is an expensive gamble that requires longer software qualification and more Non-Volatile Random-Access Memory (NVRAM) to store the bloated software.

By choosing purpose-built RTBD microcontrollers like the VA42630 or VA54230, you eliminate the Software Tax, kill the Redesign Tax, and ensure your platform survives the stratospheric dual-threat of severe radiation and extreme temperatures.

Stop babysitting your hardware and get reliability back into the silicon where it belongs.