For this kind of task, you probably want a model that has specifically been trained on every product datasheet ever, and not ten million reddit threads and forum posts about how a 555 or 328p can solve any problem.
I doubt that chatgpt has been fed every datasheet for every part made in the last decade or two. Even if it had, that's likely far outweighed by the amout of noise coming from people talking about the most common parts.
But fundamentally I'm not sure that LLMs are great for this type of work. No two datasheets are the same and I've never seen one that wasn't missing some kind of information. What you very much do not want is an LLM hallucinating a value that does not actually exist in the datasheet. Or have it conflate two parts and mix up their values. These models just don't seem to be up to the task of returning real information from abstract queries. They're just meant to generate probabilistic text sequences.