MIL-STD-883 revision differences

Q

Analogue Devices web-site and some distributors state availability of */883C
screened device. What is the difference of above with */883B devices? I was
confused between the Standard revision letter (B,C,D etc.) and the device Class
Code (B=high reliability military, S=space radiation hardened). I assume that a
device complying with MIL-STD-883C has been subjected to all tests defined
therein, and that the tests are at least as stringent as those defined in
MIL-STD-883B. Also that device data sheets assume the default Class Code as
‘B’, and if Class Code ‘S’ is required (not in my case) then the customer has
to request it.

Am I correct in my assumptions?

A

The difference is the level of testing/screening of the device and the
environment it operates in (i.e. mil temp range).
MIL-STD-883C refers to the revision standard when the device was released. Any
new production units are required to comply with the latest revision of
MIL-STD-883. MIL-STD-883C and MIL-STD-883B are equivalent today and both must
comply with the latest revision of MIL-STD-883 currently at Rev J.