A 2026 MDPI Aerospace study experimentally validated radiation-tolerant designs using commercial off-the-shelf bipolar junction transistors (BJTs). A voltage-clamp circuit maintained stable operation through 100 kilorads (krad) total ionizing dose (TID)—twice the stated 50-krad mission requirement—with negligible parametric degradation despite no prior component screening or lot control. The study also addresses single-event effects up to a linear energy transfer of 34 MeV·cm²/mg and evaluates a proportional base-driver architecture operating from 5 W to 40 W.[1]
The central method is topological overdesign: a fivefold base-current margin compensates for radiation-induced BJT gain degradation. This indicates that carefully designed linear circuits can preserve function in lunar electronics without relying exclusively on radiation-hardened components. For the Ark, the approach could protect long-duration power regulation, thermal control, environmental monitoring, data preservation, and autonomous fault-management systems; however, the 100-krad result applies to tested circuit architectures and conditions, not automatically to complete systems or all lunar radiation threats.[1]
The Ark team should establish a qualification programme for candidate COTS BJTs, voltage clamps, and proportional base drivers under representative lunar proton, electron, heavy-ion, and secondary-radiation spectra. Reproduce testing at 50, 100, and higher krad levels; characterize single-event burnout, latch-up, displacement damage, aging, temperature cycling, and vacuum operation; and require lot-to-lot verification before deployment. Integrate fivefold gain-margin design rules where validated, while retaining shielded, redundant architectures for irreplaceable life-support and archive-control functions.[1]