I wonder why (AFAIK) the military & space still use PTH components on their boards?
What is ROHS complaint and how it helps in MIL STD PCB?What does it mean when a SMD component is ROHS complaint?If you can't buy lead mil parts then you're stuck with switching to RoHS.
I haver had numerous SMD boards pass shock and ballistic tests, any ferrite cores were impregnated, components were generally tin finish, all BGA s re-balled, the only components that were problematic were SMD electrolytic so these are often replaced with a tant. or similar. Mil spec is different and more tolerant than designs for space, one of the main problems with space designs is the extreme temperature range experiences and the generally much more hostile environment... Hence the preference for true hermetically sealed ceramic packages, PTH is preferred due to the added lead compliance, some SMD components are approved, the rest of the complex circuitry is bonded chip in hybrid modules.....
In this case it is NOT the components that are at issue but the assembly process... It is this that needs sorting dry joints are unacceptable.
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