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Failure Rate
The rate at which devices form a given population can be expected (or were found) to fail as a function of time (e.g. percent per 1000 hr of operation).

Film
Single or multiple layers or coatings of paste material used to form various elements (resistors, capacitors, inductors) or interconnections and crossovers (conductors, insulators). Thick films are deposited by screen printing.

Final Seal
The manufacturing operation that completes the enclosure of the hybrid microcircuit so that further internal processing cannot be performed with out de-lidding or disassembling the package.

Fine Leak
A leak in a sealed package less than 10-5 cm3/sec at one atmosphere of differential air pressure

Fire
The term used to describe the act of heating a thick-film circuit so that the resistors, conductors, capacitors, and other integrated elements will be transformed into their final form.

Flat Pack
An integrated circuit package with leads extending from the sides and parallel to the base.

Functional Trimming
Trimming of a circuit element (usually resistors) on an operating circuit to set a voltage or current of the output.