What is semiconductor packaging?

Turning a bare, fragile die into a usable, connectable chip — everything that happens after the wafer.

What you’ll learn

What packaging is and where it sits after fabrication
The wafer → die → package → system journey
Why the wafer is not a finished product

Why it matters

The wafer coming out of the fab isn't something you can use; packaging is what turns it into a chip you can put in a product.

Explanation

Fabrication ends with a wafer holding many identical dies. Packaging is everything that comes after: cutting out each die, connecting it to the outside world, and protecting it inside a housing — the finished “chip” you can solder onto a board.

The journey is: wafer → die → die preparation (dicing) → interconnection (connecting the die's pads) → package assembly and sealing → testing → a component that goes into a system.

Packaging does three core jobs: it makes electrical connections between the tiny die and the much larger board, it protects the die mechanically and from moisture, and it gives heat a path to escape.

Visual explanation

A wafer of dies, one die singulated, then that die mounted and sealed in a package with balls underneath.

Key terminology

Die: A single chip cut from the wafer — the bare silicon with the circuit on it.
Package: The housing that protects the die and connects it to the board.
Singulation: Cutting the wafer into individual dies (dicing).

Example

A processor die is diced from its wafer, attached to a substrate, connected, sealed, tested, and shipped as the chip you see on a board.

Common mistakes

Watch out for:

Thinking a fabricated wafer is a finished product — it still needs packaging and test before it can be used.

Real-world application

Every chip in a phone, car, or data center went through packaging after its wafer was made.

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