MIL-STD-2118, MILITARY STANDARD: FLEXIBLE AND RIGID-FLEX PRINTED-WIRING FOR ELECTRONIC EQUIPMENT, DESIGN REQUIREMENTS FOR (04 MAY 1984) [S/S BY IPC-2223 and IPC222]

MIL-STD-2118, MILITARY STANDARD: FLEXIBLE AND RIGID-FLEX PRINTED-WIRING FOR ELECTRONIC EQUIPMENT, DESIGN REQUIREMENTS FOR (04 MAY 1984) [S/S BY IPC-2223 and IPC222]., This standard establishes design requirements governing flexible printed-wiring with or without shields or stiffeners and rigid to flexible printed-wiring (hereinafter referred to as rigid-flex) with or without plated-through holes and design considerations for the mounting of parts and assemblies thereon. In the rigid-flex applications, the conductor layers that are in the flexible portion are also a layer in the rigid multilayer board. All board types shall havc the conductor patterns (excluding the lands) protected by an insulating layer, except for the external conductors on the rigid section of type 4 boards. When components are mounted on flexible and rigid-flex printed-wiring, the mounting area shall be conformally coated. Conformal coating shall be in accordance with Mil-I-46058.