Avionics components are always obsolete. By the time an aitcraft gets into service the permitted components have long been superseded, sometimes incrementally but all too often by a quantum leap.
One of the worst cases was in a uk missile system which standardised on a 4½V logic family which was quickly superseded by 5V logic. Reluctant to update the entire system, the gw manufacturer went on buying the old logic family, and when it became unavailable had to buy a silicon foundry and go on making long since obsolete chipware.
The US does it differently, a good old warhorse like the B-52 gets new electronics fits as often as once a decade. Dave purchasers should provision for frequent total system refit costs.