High Quality NEC PN3645 (TO-92) Transistors AU Stock- Fast Post!. This listing is for one brand new (old stock) PN3645 (also known as. 2N3645 or CPN3645). Sourced from a recently closed retail electronics business these high quality transistors may be ideal for your next electronics repair or design project!. Please contact me if you have any questions, thankyou for viewing my listing. Note- Beware of imitations!, we will only sell you genuine components from the original manufacturers that will work well, as intended in your equipment!.