Chips built taller need more of the tools that stack them

Memory makers increasingly add density by stacking more layers rather than by shrinking features. Each extra layer means more etch and deposition steps for every wafer, which raises tool demand even when the number of wafers barely changes.

Intensity, not just volume

Equipment demand is usually discussed as a function of how many wafers the industry produces. Stacking changes that. A taller device needs more of the steps that build and cut the layers, so tool intensity per wafer rises with each generation.

Suppliers strong in those steps benefit twice in an upturn: more wafers, and more work per wafer.

What I'm watching

• Layer counts on new memory generations
• Memory makers' spending on technology upgrades against new capacity
• Etch and deposition revenue against the rest of the equipment market

Where I stand

Long, on rising process intensity per wafer as devices grow taller. It is demand that does not depend on the industry building new fabs.

What would change my mind

Memory makers slowing the move to taller devices to save capital. That would cap the intensity gains, and demand would fall back to wafer volumes alone.