The M3H-Series of DC/DC converters are radiation tolerant, high reliability devices designed for moderate radiation environments such as those encountered by low earth orbit satellites and launch vehicles. For higher radiation environments, the M3G-Series of DC/DC converters is recommended. System upgrades to higher radiation tolerance applications can be easily accommodated with the M3G-Series converters because they have the same mechanical outline and are pin compatible. For physically smaller, lower output power single and dual output applications the M3L-Series of DC/DC converters are recommended. Features of the M3H-Series include up to 40 watt output power, small size, low weight and a high tolerance to total ionizing dose, single event effects and environmental stresses such as temperature extremes, mechanical shock, and vibration. All components are fully derated to meet the requirements of MIL-STD-975 and MIL-STD-1547. Extensive documentation including Radiation Susceptibility, Thermal Analysis, Stress Analysis and MTBF are available.