Sixty years after transistors were invented and nearly five decades since they were first integrated into silicon chips, the tiny on-off switches dubbed the "nerve cells" of the information age are starting to show their age.
The devices -- whose miniaturization over time set in motion the race for faster, smaller and cheaper electronics -- have been shrunk so much that the day is approaching when it will be physically impossible to make them even tinier.
Once chip makers can't squeeze any more into the same-sized slice of silicon, the dramatic performance gains and cost reductions in computing over the years could suddenly slow. And the engine that's driven the digital revolution -- and modern economy -- could grind to a halt.
Even Gordon Moore, the Intel Corp. co-founder who famously predicted in 1965 that the number of transistors on a chip would double every two years, sees that the end is fast approaching -- an outcome the chip industry is scrambling to avoid.
"I can see (it lasting) another decade or so," he said of the phenomenon now known as Moore's Law. "Beyond that, things look tough. But that's been the case many times in the past."
Preparing for the day they can't add more transistors, chip companies are pouring billions of dollars into plotting new ways to use the existing transistors, instructing them to behave in different and more powerful ways.
Intel, the world's largest semiconductor company, predicts that a number of "highly speculative" alternative technologies, such as quantum computing, optical switches and other methods, will be needed to continue Moore's Law beyond 2020.
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