They do age on the shelf, though, but generally not as fast as when in use. What happens is you have a rising probability of ICs being dead when unpackaged, or dying earlier when used. Several aspects degrade the ICs over time.
The effect of these influences largely depends on the manufacturing process and the quality of the IC. A well-made IC may be less prone to oxidation, for instance. Older ICs (aka larger structures) have more material to be eaten away. Some ICs have dielectrics than can be more prone to aging. Modern ICs seem to be built with thinner, but more robust dielectrics.
Read More: IC Package Types: How to Choose the Right One?
#PCB Assembly
BGA reballing emerges as a critical repair technique for modern electronic devices. Nowadays, electronic devices…
Do you know what PCB stiffeners are? They are widely used in flex and rigid-flex…
In the PCB manufacturing process, PCB warpage is a common problem that manufacturers would encounter.…
In the world of printed circuit board design and manufacturing, precision and accuracy are paramount.…
Soldering is a cornerstone technique in electronics assembly, it's used to connect electrical pieces and…
Nowadays, electronic products are both compact and lightweight while performing a variety of functions. This…