A sliver of germanium hums to life; Kilby proves the integrated circuit works
Texas Instruments had just returned from its summer shutdown, and Jack Kilby, a new engineer with no accrued vacation, had spent the quiet weeks alone with a problem the industry called the tyranny of numbers. On September 12, 1958, he brought a small piece of germanium, wired with a transistor, a capacitor, and three resistors linked by fine gold wires, into a room with company management, including Mark Shepherd. He attached an oscilloscope and pressed a switch. A continuous sine wave appeared on the screen, An entire circuit could live on a single piece of semiconductor.
Kilby's germanium sliver, built inside a Dallas lab because a junior engineer had nowhere else to be that August, became U.S. Patent 3,138,743 and the founding document of the American semiconductor industry. Every silicon chip made in Silicon Valley traces back to that oscilloscope reading.
QWhy did Kilby originally propose micromodules to the Army instead of an integrated circuit?
Kilby had pitched the U.S. Army on a different fix for circuit complexity: small ceramic substrates called micromodules, each holding one miniaturized component that could be stacked into a compact grid. The Army bit, launching the short-lived Micromodule Program in 1957, patterned after an earlier effort called Project Tinkertoy. Kilby continued developing this idea after joining Texas Instruments in 1958, before abandoning it for the integrated circuit. Kilby kept working the problem after moving to Texas Instruments, and as the micromodule project gained momentum he abandoned it for something more radical: putting every component on one piece of semiconductor rather than assembling many tiny finished parts. The integrated circuit grew directly out of walking away from his own government-funded idea.
QWhat made Kilby's germanium chip technically inferior to what powers phones and computers today?
Kilby's 1958 device was not a true monolithic chip. It depended on external gold-wire connections strung between components, a method that made large-scale manufacturing impractical. About six months later, Robert Noyce at Fairchild Semiconductor solved that problem with a silicon chip built using Jean Hoerni's planar process, which allowed reliable aluminum interconnections printed directly onto the chip surface. That approach, not Kilby's germanium-and-gold-wire original, became the template for every modern IC. The distinction mattered enough that patent law and Nobel committees treated the two men as co-inventors working on separate halves of the same breakthrough, one proving the concept, the other making it manufacturable at scale.
QWho bought the very first integrated circuits off the line?
The U.S. Air Force was the first customer for Kilby's invention, not a consumer electronics company. Military demand carried the technology through its expensive, unproven early years: Texas Instruments built the first computer incorporating integrated circuits for military use, and the Minuteman missile program contracted for TI integrated circuits in 1962. NASA's Apollo Program then became the largest single consumer of integrated circuits between 1961 and 1965, buying chips in volumes no commercial buyer would have risked on brand-new technology. Government contracts, not the consumer market, kept integrated circuit production alive long enough for prices to fall and civilian uses to catch up.
