Packaging · Topic 3 of 14
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Die vs package
The bare silicon chip versus the finished, connectable component it lives inside.
What you’ll learn
- The difference between a die and a package
- What a die is and where it comes from
- What the package adds around it
Why it matters
These two words come up constantly in packaging; mixing them up makes everything else confusing.
Explanation
A die is the bare piece of silicon cut from the wafer — the actual circuit, with microscopic connection pads, but fragile and impossible to handle or connect directly.
A package is the finished housing built around one (or more) dies: it mounts the die, routes its connections out to board-level pins or balls, seals it, and manages heat. The “chip” on a circuit board is the package; the die is inside it.
One package can hold a single die (traditional packaging) or many dies (advanced packaging — chiplets, 2.5D, 3D).
Visual explanation
Key terminology
- Bare die
- A die that has not yet been packaged.
- Known-good die (KGD)
- A die already tested and confirmed working before packaging.
Example
Common mistakes
Watch out for:
- Using “chip” loosely — usually the chip you handle is the package; the die is the silicon inside it.
Real-world application
“Bare die” versus “packaged parts” is a real distinction in the supply chain, especially for advanced packaging.
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Die vs package
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Package substrate
Packaging
The carrier inside the package that fans the die's tiny connections out to the board.
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