Texas Instruments SNJ54S240J IC

​National Semiconductor LM123K Voltage Regulator

​This is a vintage dual-output positive voltage regulator manufactured by National Semiconductor (now part of Texas Instruments).

​Specs: The LM123K is a highly-reliable voltage regulator designed for demanding applications. The "K" suffix specifies the high-power, hermetically sealed TO-3 metal can package. The date code Y8830 indicates it was manufactured in the 30th week of 1988. This type of component was commonly used in military, aerospace, and high-end industrial power supplies.