PCB Glossary

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...

Tented Via

PCB Glossary

Temperature Profile

The depiction of the temperature that a selected point traverses as it passes through the re-flow process.

Temperature Profile

PCB Glossary

Teflon

Du Pont trade name as an inventor for PTFE(Polytetrafluoroethylene).

Teflon

PCB Glossary

Taped Components

Components attached to continuous tape for automatic assembly.

Taped Components

PCB Glossary

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...

Tape-and-reel

PCB Glossary

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.

Swaged Lead

PCB Glossary

Surfactant

A chemical added to the cleaning solution to lower surface tension and to promote wetting.

Surfactant

PCB Glossary

Surface Tension

The natural, inward, molecular attraction force that inhibits the spread of a liquid at its interface with a solid material.

Surface Tension

PCB Glossary

Surface Mounting

The electrical connection of components to the surface of a conductive pattern that does not utilize component holes.

Surface Mounting

PCB Glossary

Surface Leakage

The passage of current over the boundary surface of an insulator as distinguished from passage through its volume.

Surface Leakage

PCB Glossary

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)

PCB Glossary

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).

Surface Insulation Resistance(SIR)Test

PCB Glossary

Supported Hole

A hole in a printed board that has its inside surface plated or otherwise reinforced.

Supported Hole

PCB Glossary

Subtractive Process

A process for obtaining conductive patterns by selective removal of unwanted areas of conductive foil from a metal clad base material.

Subtractive Process

PCB Glossary

Substrate

See Base Material.

Substrate

PCB Glossary

Stripline

A type of transmission line configuration which consists of a single narrow conductor parallel and equidistant to two parallel ground planes.

Stripline

PCB Glossary

Strain

The deformation resulting from a stress.

Strain

PCB Glossary

Straight-through Lead

A component lead that extends through a hole and is terminated without subsequent forming.

Straight-through Lead

PCB Glossary

Step-and-repeat

A method by which successive exposures of a single image are made to produce a multiple-image production master.

Step-and-repeat

PCB Glossary

Step Soldering

The making of solder connections by sequentially using solder alloys with successively lower melting temperatures.

Step Soldering

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