Tented Via
A via with solder mask completely covering both its pad and its plated through-hole. This completely insulates the via from foreign objects, thus protecting against accidental shorts, but it also rend...
Temperature Profile
The depiction of the temperature that a selected point traverses as it passes through the re-flow process.
Tape-and-reel
A packaging method of housing surface-mount parts in their own tape cavities in a long continuous strip. The cavities are covered so that the tape can be wound around a reel for convenient handl...
Swaged Lead
A component lead wire that extends through a hole in a printed board and its lead extension is flattened(swaged)to secure the component to the board during manufacturing operations.
Surfactant
A chemical added to the cleaning solution to lower surface tension and to promote wetting.
Surface Tension
The natural, inward, molecular attraction force that inhibits the spread of a liquid at its interface with a solid material.
Surface Mounting
The electrical connection of components to the surface of a conductive pattern that does not utilize component holes.
Surface Leakage
The passage of current over the boundary surface of an insulator as distinguished from passage through its volume.
Surface Insulation Resistance(SIR)
A measure in ohms of an insulating material’s (as in FR-4) electrical resistance between conductors.
Surface Insulation Resistance(SIR)Test
Test for the level of resistance of an insulating material, such as FR-4.between conducting members of a board (traces, contacts).
Supported Hole
A hole in a printed board that has its inside surface plated or otherwise reinforced.
Subtractive Process
A process for obtaining conductive patterns by selective removal of unwanted areas of conductive foil from a metal clad base material.
Stripline
A type of transmission line configuration which consists of a single narrow conductor parallel and equidistant to two parallel ground planes.
Straight-through Lead
A component lead that extends through a hole and is terminated without subsequent forming.
Step-and-repeat
A method by which successive exposures of a single image are made to produce a multiple-image production master.
Step Soldering
The making of solder connections by sequentially using solder alloys with successively lower melting temperatures.
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