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

High-performance CMOS process started at Digital's Hudson, Massachusetts foundry in the mid-1980s along with Digital's new CMOS VLSI microprocessor designs. Digital adopted a similar manufacturing strategy to Intel whereby scaling of feature sizes occurs along with their development of new generations of high-performance microprocessors. Digital continued to operate the Hudson fab until 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). Intel continued to operate the fab until late 2013 when they announced that it will be closing the Hudson Fab due to no longer meeting their requirements such as aging technology.

Year	Process	Node	MLayers	µarchs	Attributes
1984	ZMOS	3 µm	2	V-11, MicroVAX II	Tox	43 nm
					Lg	3 µm
1986	CMOS-1	2 µm	2	CVAX	Tox	30 nm	Masks	12
					Vdd	5 V
					Lg	2 µm
1988	CMOS-2	1.5 µm	2	CVAX+, Rigel	Tox	22.5 nm	Masks	13
					Vdd	5 V
					Lg	1.5 µm
1990	CMOS-3	1 µm	2	Mariah	Tox	15 nm	Masks	20
					Vdd	3.3 V
					Lg	1 µm
1991	CMOS-4	0.75 µm	3	Alpha 21064, NVAX	Tox	10.5 nm	Masks	21
					Vdd	3.3 V	SRAM	100 µm²
					Lg	0.75 µm	Leff	0.50 µm
1996	CMOS-4S	0.675 µm	3	NVAX, NVAX+, SOC	Tox
					Lg	0.675 µm
1994	CMOS-5	0.50 µm	4	Alpha 21164, NVAX++	Tox	9 nm
					Vdd	3.3 V
					Lg	0.50 µm	Leff	0.365 µm
1996	CMOS-6	0.35 µm	4	Alpha 21264, StrongARM	Tox	6 nm
					Lg	0.35 µm	Leff	0.25 µm
1997	CMOS-7	0.25 µm	5		Tox
1997	Changed ownership to Intel (see Intel's Process)
2013	Intel announced that it will be closing the Hudson Fab due to dated technology.

Additionally, DEC fabricated on Motorola's ECL process:

Mosaic1	3 µm ECL
Mosaic2	1 µm ECL
Mosaic3

Other processes

Semiconductor Process history by company:

• DEC
• Intel