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LM117K/883B has been replaced by the LMK117/883. It is a military grade part. The letter "B" was dropped from the product name due to a change in the military standard, MIL-STD-883. It used to require that the revision of MIL-STD-883 be included in the part name but that was dropped after rev. C in the 1990s.
LM117K, also known as LM117K STEEL is the commercial version of the part.
