How to decipher coding on Voltage Regulator
7805A is the part number - standard +5V regulator.

Usually the other numbers are things like batch numbers, lot codes, production dates etc. You are highly unlikely to find one where these numbers are identical to yours, but then you don't need to. Theoretically all 7805's should be compatible.



As to your one, if you google the part number (7805A) and manufacturer (KIA) you can very easily find the datasheet. Generally the package labelling is explained in the datasheet, although not in this one it seems. But at least if you have the datasheet you can find another 7805 and verify that the new one matches the specifications within the range which you are using it.