The first techno-thriller was not penned by Tom Clancy, but by Craig Thomas. It was called Firefox and it’s a great read. It’s not cheesy or poorly written like many of the genre and actually presents a plausible aircraft of then-Soviet design: The Mig-31. NATO Codename: Firefox.
The book spawed a movie, starring Clint Eastwood and is pretty good in itself. The novel is now out of print, having been written in 1979, so you’ll have to grab it on Amazon.com.