Many were among the first analog integrated circuits commercially produced since late 1965;[1] some were groundbreaking innovations[opinion].
[2] The LM series originated with integrated circuits made by National Semiconductor.
[2][3] The prefix LM stands for linear monolithic, referring to the analog components integrated onto a single piece of silicon.
[4] Because of the popularity of these parts, many of them were second-sourced by other manufacturers who kept the sequence number as an aid to identification of compatible parts.
[3] Several generations of pin-compatible descendants of the original parts have since become de facto standard electronic components.