Because NE555P and NE555N are common integrated circuit models, their pin arrangement, functions and parameters are the same, but the package is different, one is DIP package, one is SMD package.
In circuit design, as long as the electrical parameters and pin correspondence are consistent, the two models can be used instead of each other.
It should be noted that the appearance of the two is different, so it is necessary to choose different types for design and use according to their needs.
Because ne555p and ne555n are essentially the same chip, only slightly different in package form, but their pin functions and electrical characteristics are consistent, and the same circuit can be used to drive them
In addition, if you need to use these two models of chips, It should be noted that different packages may lead to different ways of installing the circuit board, and corresponding changes need to be made, but this does not affect the versatility of the chip.