The KA79M12TU from onsemi is a linear voltage regulator Integrated Circuit with a negative fixed -12 V output rated at 500 mA, with 1 output in a TO-220-3 package.
The KA79M12RTM from Fairchild Semiconductor is a negative fixed linear voltage regulator Integrated Circuit with 1 output rated at 500 mA, in a D-Pak package.