Uni-body Plug-in Package is the main packaging form for hybrid integrated circuits, whose base material is Kovar (Fe-Ni-Co Alloy).
Cylindrical leads are introduced from package bottom and normally in dual-line plug-in layout. Number of leads varies from 8 to 84 according to different packages.
Commonly, package is entirely gold plated. Surface plated nickel and lead plated gold is also widely used. Applied sealing method of Uni-body Plug-in package is parallel seam welding, and etched step type lids are used as package covers.
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