Significant space savings (see photo), as well as improved performance and reliability can be achieved using Hybrid construction, and as such has traditionally been used in Military, Space and Aviation applications where size, performance and reliability cannot be compromised.

Many Hybrid Microcircuits are "custom" designed for specific (Analog and/or Digital) applications, using "chip" versions of the packaged parts traditionally used on printed circuit boards.  Hybrid circuits can also incorporate custom thick or thin-film resistors which can be "actively" laser trimmed for precision circuit performance.  For long term reliability, most Hybrids are contained within a metal or ceramic "hermetically" sealed package.