Space Power Supplies - Modular Devices, IncAerospace units from space heritage designs offering realistic development costs and lead times. Modular Devices, Inc. (MDI) designs and manufactures many types of power supplies and DC–DC converters for space application. Our products have been used in applications such as the Space Station, Space Shuttle, and.mdi space grade screening spec,Part Numbering System - Modular Devices, IncMDI'S ALPHANUMERIC PART NUMBERING SYSTEM . Blank, Industrial Grade Unit - Full power output from -55°C to +85°C case temp, linearly derates to zero at 115°C; 24 hours burn-in, 25°C test data only. EU, Engineering Unit - Full power output from -55°C to +85°C case temp, linearly derates to zero at 115°C;.