# [TECH] Integrated Circuit

**The Integrated Circuit (IC)** — a single semiconductor chip containing multiple transistors, resistors, and capacitors — was independently invented by Jack Kilby (TI, 1958) and Robert Noyce (Fairchild, 1959) and became the engine of the digital revolution.

## Overview

Before ICs, electronic systems were built from discrete components hand-soldered together. The IC allowed miniaturisation, cost reduction, and reliability improvements of orders of magnitude. Gordon Moore observed (1965) that transistor density doubles approximately every two years ("Moore's Law"), a trend that held for 50 years. The Intel 4004 (1971, 2,300 transistors) was the first commercial microprocessor; NVIDIA's H100 (2022) contains 80 billion transistors. The foundry model (TSMC, 1987) industrialised IC manufacturing to the most complex manufacturing process ever devised.

## Key Actors

- **Companies**: Texas Instruments (1951), Fairchild Semiconductor (1957), Intel (1968), TSMC (1987), Samsung (1969), NVIDIA (1993)
- **Inventors**: Jack Kilby (1923–2005, **Nobel Prize 2000**), Robert Noyce (1927–1990, no Nobel)

## Key Patents

- Kilby, J. US Patent 3,138,743 (1964) — integrated circuit
- Noyce, R. US Patent 2,981,877 (1961) — semiconductor device-and-lead structure

## Economic Value

Global semiconductor market: **USD 600 billion/year** (WSTS 2023). Electronics, computing, and communications enabled by ICs: USD 10–15T/year. The IC is arguably the single most economically important invention of the 20th century.

## Notes

WSTS *Semiconductor Market Forecast* 2023. McKinsey estimates cumulative IC-enabled economic value at >USD 100T since 1960.

## What This Enables

- **[TECH] Personal Computer** — The microprocessor (an IC) is the central processing unit of every personal computer.
- **[TECH] Mobile Phones & Smartphones** — Smartphone SoCs integrate CPU, GPU, modem, and AI accelerator on a single die — advanced IC engineering.

## Discovery Character
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**Surprise level**: Extreme — Moore's Law — transistor density doubling every ~18 months for 50 years — was not anticipated. Kilby's original IC contained 5 components; NVIDIA's H100 (2022) contains 80 billion transistors. The enabling of the digital economy (USD 15T+/year) was wholly unforeseen.
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**Mode**: Serendipitous conceptual insight, systematic execution. Jack Kilby arrived at Texas Instruments in the summer of 1958, too new to take a company vacation. Alone in the lab, he conceived the monolithic idea — put everything (transistors, resistors, capacitors) on the same piece of semiconductor — in a flash. He sketched it on 24 July 1958. Noyce had the same insight independently at Fairchild. Both insights were simple; both were overlooked by established engineers who believed discrete components were necessarily separate objects.
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# Parents

* [TECH] Transistor
* [TECH] Transistor