Which logical element is better to use for optimality?

Question

Electronics

It is necessary to produce one disjunction of two variables with inversion at the output.
Which element will be more optimal, K155LE1 or K155LE3?

Answer 1

Depends on the task. Is there still a need for NOR? As said above, it can be assembled on LA3, but this (maximum) requires 4 NAND elements. But if you have the values ​​of those two variables already inverted, then only 2 elements are required. So, if you use any LA3 in the unused element mode (twice), you will be able to reduce one chip.
One of the options.
In general, there is a lot of room for minimization, but you need to know the full scheme.

Answer 2

PLIS, of course! ☺
How can you judge optimality without having a general idea about this device? If you just need to make a block in a children's constructor, then this is one thing. And if in some complex circuit it’s completely different (there, for the sake of such elementary things, it makes no sense to solder a discrete element, and even in a DIP package - this is generally tin!).