Die-to-Wafer (D2W)

Die-to-Wafer (D2W) is an advanced semiconductor packaging and 3D integration technique in which individual semiconductor dies are bonded onto a target wafer. Unlike traditional wafer-to-wafer (W2W) bonding, where two complete wafers are joined together, D2W allows only selected dies—typically known-good dies (KGD)—to be integrated onto a wafer. This significantly improves manufacturing yield and enables heterogeneous integration.

D2W vs W2W

Characteristic	Die-to-Wafer (D2W)	Wafer-to-Wafer (W2W)
Bonding unit	Individual dies	Entire wafers
Yield	Higher (KGD selection)	Lower when one wafer contains defects
Throughput	Lower	Higher
Heterogeneous integration	Excellent	Limited
Chiplet support	Ideal	Less flexible
Manufacturing complexity	Higher	Lower

W2W offers superior throughput because complete wafers are bonded in a single operation. However, if either wafer contains defective dies, yield losses can be significant. D2W addresses this issue by allowing only tested, functional dies to be assembled.

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