Meaning
Quality control protocols in semiconductor manufacturing verify the physical and electrical integrity of individual microchip dies before they are packaged. The execution of silicon die inspection identifies microcracks, contamination, and photolithographic defects on the wafer surface. Supply contracts for foundries and packaging houses define the permissible defect density and the specific inspection methodologies to be used.
These standards ensure that only known good dies are sent for assembly, minimizing packaging waste.
Sourcing Obligation
Purchase agreements between semiconductor buyers and foundries establish the inspection tools and automated optical systems that must be employed. The foundry must provide inspection logs for every processed wafer batch to demonstrate compliance with quality standards. If the silicon die inspection reveals a defect rate above the agreed threshold, the buyer can reject the entire wafer lot or demand a price reduction.
This contractual mechanism protects buyers from paying for non-functional silicon.
Financial Liability
Financial liability for defective dies that pass inspection but fail after packaging is a frequent point of contract negotiation. If the inspection failed to detect a wafer-level defect, the foundry often covers the cost of both the lost silicon and the packaging materials. This risk sharing encourages foundries to maintain rigorous silicon die inspection regimes.
Delivery Release
Shipment release is contingent upon the inspection report. Buyers require these electronic records to be delivered prior to or alongside the physical wafer shipment.
