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Glossary of terms

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Term Definition
jackscrews   A means of controlling the plugging together of connectors and locking them in place. Rotation of the screws jacks the connectors together or apart. This is particularly useful for connectors having a large number of contacts and therefore a high insertion and withdrawal force.
JEDEC   (Joint Electronic Device Engineering Council). JEDEC is the semiconductor engineering standardisation body of the Electronic Industries Association (EIA), and develops and publishes configuration standards for semiconductor device packages.
JIT (Just-In-Time )   Minimizing inventory by supplying material and components directly to the manufacturing line just before incorporating them into the product.
J-lead   A lead configuration typically used on plastic chip carrier packages which have leads that are bent underneath the package body. A side view of the formed lead resembles the shape of the letter ‘J’ . The PLCC has J-leads on all four sides, and the limiting factors regards lead dimension is the need to form the leads. In consequence, PLCCs typically have a lead spacing of 1.25mm (0.05 in). J-leads made with thinner material, and on closer pitches, are generally only found in the SOJ package, used for memory devices, which has leads only on the two shorter edges. Whilst the J-lead configuration appears to conserve board space, as opposed to the gull-wing design, the high lower limit on lead spacing means that J-lead packages are generally substantially bigger than the gull-wing equivalents
jumper   A component or wire that forms a discrete electrical connection between conductive areas on the external surface of a circuit board. Some jumpers are added during normal assembly, through-hole components using formed wire, and surface mount assemblies using zero-ohm chip resistors. Others are pluggable components. Another use of the term ‘jumper’ is for an electrical connection which is added after fabrication, usually to correct errors or to enable modification of circuitry. Such jumpers are typically made of wire (exceptionally of flexible circuit board), soldered to the surface, and thus referred to as “wire adds”. In order to ensure a reliable joint, this repair operation has to be conducted with extreme care, An alternative way of making jumpers uses wire-wrapping around terminals
jump-scoring   Similar to v-scoring, this is a process that is used when a printed circuit board is panelized. It allows for a score line to jump over most of the panel border, leaving the border largely intact, and as a result, stronger and more rigid, resulting in a stiffer and stronger assembly panel.
junction temperature   The operating temperature of the active element of a circuit component.