See also: List of series integrated circuits Part number schemes varied by manufacturer. The part numbers for series logic devices often use the following designators: Often first, a two or three letter prefix, denoting the manufacturer and flow class of the device e. These codes are no longer closely associated with a single manufacturer, for example, Fairchild Semiconductor manufactures parts with MM and DM prefixes, and no prefixes. Two digits, where "74" denotes a commercial temperature range device and "54" denotes a military temperature range.
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