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.

The battery has high capacity as used in motorcycle. So battery life is not of much issue. But the heat dissipation is.

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?

I know the heat dissipation will be higher when using the linear regulator, but using switching regulator will make huge impact on the cost.

Any other alternative to step down supply from 12V to 5V with less heat dissipation and low BOM cost.?

Thermal Data of the part :