SAN JOSE — Northrop Grumman has decided to shut a San Jose plant in a downsizing that will eliminate 78 jobs and widen employment losses in the Bay Area’s tech sector, a new state government filing shows.

Employees at 6379 San Ignacio Ave. are part of the cuts by the aerospace manufacturer. Northrop Grumman Info Systems, a unit of Northrop Grumman that often provides information technology services to federal government agencies, operates at the site.

“Due to a program winddown and location consolidation effort, Northrop Grumman is closing its San Jose facility,” Michelle Cacho, a director of human resources with Northrop Grumman, wrote in a WARN letter to the state Employment Development Department.

The relevant program that was winding down wasn’t disclosed in the WARN letter.

“The c

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