On March 4, 2026, Micross announced the AFLS28XX Class H+ series: hermetically packaged 28-volt, 120-watt DC-DC converters for space systems. The devices are rated to 50 kilorad(Si) total ionizing dose and 60 MeV·cm²/mg single-event effects, meet MIL-PRF-38534 Class H screening, and undergo particle-impact-noise detection and radiography testing. Single- and dual-output versions cover 5–28 volts; engineering samples were reported available within 4–6 weeks after order receipt.[1][4]
For a lunar ark, the principal value is failure containment in distributed power architecture. The converters’ radiation tolerance, hermetic packaging, internal current sharing, parallel operation above 120 watts, and synchronization near 525 kHz can support redundant power buses and modular loads. However, the stated qualification targets are aimed at LEO and “new space” environments, not automatically at the harsher and less shielded lunar-surface or deep-space mission profile; qualification must include cumulative solar and galactic radiation, thermal cycling, vacuum, dust effects at the system level, and single-event transients. The 50-kilorad(Si) rating should therefore be treated as a component limit, not a complete habitat reliability guarantee.[1][2]
The Ark team should obtain radiation-test data, derating curves, failure-rate projections, lot-control documentation, and long-duration thermal-vacuum results before adoption. Prototype a fault-tolerant power module using parallel AFLS28XX units, validate operation under lunar worst-case radiation and load transients, and compare lifecycle cost and supply continuity against higher-rated converters; Micross’s vertically integrated sourcing and obsolescence-mitigation claims merit audit rather than acceptance.[2]