What is difference between LMC6482AIMX VS LMC6482AIMX/NAK2 ?

Welcome to the Digi-Key TechForum hsiaohua.wu
The NAK2 suffix is not on the normal datasheet. Since this is a MarketPlace product, you will have to check with the supplier (Rochester Electronics LLC) for the meaning of that suffix.

Hello @hsiaohua.wu, the NAK2 suffix is obsolete(custom) and looks to have to do with the lead finish materials (plating, epoxy, and leadframe). The part should have the same die and function the same. See link → LM2903MX/NAK1 - Meaning behind suffix - Amplifiers forum - Amplifiers - TI E2E support forums