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Mask
The photographic positive (or negative) that serves as the master for making thick-film screens.

Mesh Size
The number of openings per inch in a screen. A 325 mesh screen has 325 openings per linear inch, or 105,625 openings per square inch.

Metallization
A film pattern (single or multi-layer) of conductive material deposited on a substrate to interconnect electronic components, or the metal film on the bonding area of a substrate which becomes a part of the bond and performs both an electrical and a mechanical function.

Metal to Glass Seal (or glass-to-metal seal)
An insulating seal made between a package lead and the metal package by forming a glass bond to oxide layers on both metal parts. in this seal, the glass has a coefficient of expansion that closely matches the metal parts.

Microcircuit
A small circuit (hybrid or monolithic) having a relatively high equivalent circuit element density, which is considered as a single part on (hybrid) or with (monolithic) a single substrate to perform an electronic circuit function. (This excludes print wiring boards, circuit card assemblies, and modules composed exclusively of discrete electronic parts).

Microelectronics
The area of electronic technology associated with or applied to the realization of electronic systems from extremely small electronic parts of elements.

Migration
An undesirable phenomenon whereby metal ions, notably silver, are transmitted through another metal, or across an insulated surface, in presence of moisture and an electrical potential.

MTBF
The Acronym for Mean Time Between Failures applied statistically to reliability studies.

Multilayer Ceramic Capacitor
A Miniature ceramic capacitor manufactured by paralleling several thin layers of ceramic. The assembly is fired after the individual layers have been electroded and assembled.

Multilayer Substrates
Substrates that have buried conductors so that complex circuitry can be handled. Assembled using processes similar to those used in multi-layer ceramic capacitors.


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