A fabricated die is not yet a finished product

After wafers are processed, individual dies still need to be separated, connected to a package, tested and qualified before they can be integrated into systems. Assembly, test and packaging turn fragile silicon into a component that can be handled, mounted and operated reliably.

What packaging does

A package provides electrical connections, mechanical protection and a path for heat to leave the die. Depending on the product, the die may connect to a substrate through wire bonds or bumps, and the finished package may connect to a board through solder balls or leads.

Typical assembly steps

  1. Wafer probing or initial electrical screening.
  2. Wafer dicing into individual dies.
  3. Die attach to a substrate or package.
  4. Electrical interconnect through wire bonding or flip-chip attachment.
  5. Encapsulation or lid attachment.
  6. Formation of board-level contacts such as solder balls.
  7. Final electrical test and inspection.

Why test happens at several stages

Testing early can prevent additional assembly cost being spent on a defective die. Final test verifies that the packaged device meets functional and performance limits. Reliability qualification may add thermal, mechanical and environmental stresses depending on the target market.

Packaging affects performance

The package is part of the electrical and thermal system. High-speed interfaces depend on signal integrity through the substrate and board connection. High-power devices need an effective thermal path. Advanced packages may place several dies or chiplets close together to increase bandwidth and integration.

Yield and traceability matter

Manufacturing quality is not only about passing a test once. Process control, lot traceability and failure analysis help teams identify systematic problems and improve yield over time.

For modern AI hardware, package design cannot be treated as an afterthought. Power delivery, memory bandwidth, thermal limits and system form factor can all be constrained by the package.

Questions for an assembly and test partner

  • Which package technologies and die sizes are supported?
  • What electrical and thermal tests are available?
  • How are lots and failures traced?
  • What are the qualification options for the target market?
  • Can the partner support prototype volumes as well as scale-up?
  • How are test programs transferred and maintained?

Planning your next AI hardware step?

PathinAI works from workload requirements toward the right silicon or infrastructure path.

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