Definition
A complete electronic circuit — including transistors, resistors, diodes, and the connections between them — manufactured as a single small chip of semiconductor material, usually silicon. The entire circuit is formed within and on the surface of one piece of material rather than being built from separate components wired together.
Plain English
A tiny chip that contains a whole electronic circuit built into it, instead of being made from lots of separate parts joined by wires.
Context Anchor
Seen in discussions of aircraft electronics, radios, navigation equipment, digital instruments, and electronic control units.
Derivation
Integrated comes from the Latin integrare, meaning to make whole or combine into one. Circuit comes from the Latin circuitus, meaning a going around — the closed path that electricity flows through. So an integrated circuit is a complete electrical loop combined into a single piece.
Why Pilots Care
Integrated circuits are what made compact, reliable avionics possible. Understanding that a single chip replaces hundreds or thousands of older components helps explain why modern equipment is lighter, uses less power, and fails differently than older wired electronics — usually the whole unit is replaced rather than repaired.
Analogy
An integrated circuit is like taking a large table full of small electronic parts and shrinking their work into one tiny package.
Intuition Check
Do not read integrated as meaning simply “installed in the airplane.” Here it means the circuit’s parts are built together into one small electronic unit.
Example Sentence 1
The transponder failed in flight, and the technician traced the problem to a faulty integrated circuit on the main board.
Example Sentence 2
Technicians replaced the faulty integrated circuit in the autopilot module before the next flight.