Can this EP1C6Q240I6 industrial part can be directly used in place of EP1C6Q240C6Ncommercial grade ?

Hi shamlal,

As long as the speed grade is the same it shouldn't be an issue. You should not have problems targeting a slow device and then running it on a faster device unless a minimum timing path is faster than the design can tolerate. You may only experience timing problems if targeting the place-and-route to a fast device and then download to a slower device. You may check the following KDB which applicable to your concerns:

Are programming and configuration files compatible across speed grades?

Are there any differences in the DC and switching characteristics of industrial temperature devices ...

Regards,

Fakhrul