This article details details DEC's Semiconductor Process Technology history for research and posterity.

The table below shows the history of DEC's process scaling. Values were taken from various DEC documents including historical presentations and journals, ISSCC papers, and IEDM papers. Note that while a great deal of effort was put into ensuring the accuracy of the values, some numbers vary to a small degree between DEC's own documents and therefore discrepancies may exist.

Timeline

Year	Process	Node	MLayers	µarchs	Attributes
	ZMOS	3 µm	2	V-11, MicroVAX II	Tox	43 nm
	CMOS-1	2 µm			Tox
	CMOS-2	1.5 µm			Tox
	CMOS-3	1 µm			Tox
1991	CMOS-4	0.75 µm	3	NVAX, Alpha 21064	Tox	10.5 nm
					Vdd	3.3 V	SRAM	100 µm²
					Lg	0.75 µm	Leff	0.50 µm
	CMOS-4S	0.675 µm	3		Tox
1994	CMOS-5	0.5 µm	4		Tox
	CMOS-6	0.35 µm	4		Tox
1997	CMOS-7	0.25 µm			Tox
1997	Fab-6 in Hudson, Mass was sold to Intel which consequently upgraded it for $800M to Intel's propiatery 0.18 µm (see Intel's Process).
2013	In late 2013 Intel announced that it will be closing the Hudson Fab due to no longer meeting their requirements such as aging technology.