I have battery source which provides 12V supply and I need to feed 5V to the MCU. The electronic in which it will be use, will be running continuously for 10-12 hours per day. I have very less current requirement of around 100 mA.

I am planning to use L78L05 positive regulator from ST. Here is the part :

I could have use the switching regulator but it will be expensive, I have to keep BOM cost as less as possible. So is it a good idea to use above part? Any other part can I use?