Symbol designation for capacitance, bias supply and centigrade.
Symbol designation and standard physics term for the velocity of light in vacuum/air (absolute). The velocity is equal to 3 x 108 m/sec.
A Premium line high density interconnect system based on a grid of .100". Single and dual row.
See also SL.
A Premium line interconnection system that offers complete design flexibility and modular components that provide the widest range of electronic packaging alternatives available. The C-Grid III system is fully compatible with the industry standard DIN 41651, as well as with the French norm HE-13/14. It is intermateable/interchangeable with Premium line's QF 50 product range.
A compliant press-fit pin used on Premium line DIN 41612 and other products. A simple press-fit solderless operation for PCB termination. Uses a C-shape that gives uniform contact forces over 300° (of the 360°) of the plated through hole.
See Box-to-Box.
A cable with plugs or connectors on each end, or within the assembly.
In fiber optics, general use of these cable assemblies include the interconnection of multimode and single mode fiber optic cable assemblies. If connectors are attached to only one end of the cable, it is known as a pigtail. If connectors are attached to both ends, it is known as a jumper.
A device used to give mechanical support to the wire bundle or cable at the rear of a plug or receptacle.
A mechanical adapter that attaches to the rear of a plug or receptacle to allow the attachment of a cable clamp.
Refers to ribbon cable that does not have a connector or terminal attached.
The direction (horizontal, vertical or at an angle) in which the cable will be terminated.
Specified length/direction between twists on stranded conductors.
See Insulation Pierce.
In power work, also known as a pothead or end bell, it is a device which seals the end of a cable and provides insulated egress for the conductors.
The method by which a group of insulated conductors is mechanically assembled (or twisted together).
Flexible copper, synthetic tapes, felted asbestos and lacquered braid, 1000 in, 125º C.
Application of SRAM to speed microprocessor. (Also called L2 Cache.)
A small high speed memory device designed to supply the processor with the most frequently requested instructions and data. Also known as cache Random Access Memory (RAM).
Cache memory can be three to five times faster than traditional system memory.
Level 1 (L1) cache refers to the processor's built-in cache memory, while level 2 (L2) cache refers to the cache memory on the motherboard external to the processor.
Computer Aided Design
Overall flat cable thickness.
Computer Aided Manufacturing
A structure (e.g. beam, a terminal, etc.) that is supported on one end only.
A spring contact in which the contact force is provided by one or more cantilevered springs. It permits more uniform contact pressure and is used almost exclusively in printed circuit board connectors.
Dual cantilever contacts have two cantilevers, which act in unison to provide a linear force increase as the pin is pushed into the housing.
The ability of a dielectric material between conductors to store electricity, when a difference of potential exists between the conductors.
The unit of measurement is the Farad, which is the capacitance value ( C ) in electrostatics which will store a charge ( Q ) of one coulomb on each conductor (of opposite polarity) when a one volt potential difference ( V ) is applied between the conductors or C = Q / V.
In AC or dynamic conditions, one Farad is the equivalent capacitance value which will permit one ampere of current, when the voltage across the capacitor changes at a rate of one volt per second.
Under DC conditions, capacitance represents an "open circuit" with no current flow. Under AC conditions, capacitance conducts AC current, improving with increased frequency.
Line capacitance is capacitance normalized per unit length of a distributed transmission line, as the equivalent circuit of the line. Its units of dimensions are then Farads / unit length.
The opposition to alternating current due to the capacitance of a capacitor, cable, or circuit. It is measured in ohms and is equal to l/6.28fC where f is the frequency in Hz and C is the capacitance in farads. Capacitance (C) is also the AC reactance (and a function of frequency) which resists a changing voltage in a circuit, storing / releasing energy reversibly in its electrical field every cycle. It is given as Xc = ( - j / w C ) in ohms, where C is the capacitance, w is the frequency, and j is an imaginary operator, respectively.
Electrical interaction between two conductors caused by the capacitance between them.
Two conducting surfaces separated by a dielectric material. The capacitance is determined by the area of the surfaces, type of dielectric, and spacing between the conducting surfaces.
Captive Device
A multi-part fastener, usually a screw-type, whose components are retained without separation when loosened from its base assembly.
Part of PC Card standard that allows PC Card and hosts to use 32-bits busmastering and to operate at speed of up to 132 MB/sec at a clock frequency of 3 3 MHz.
PCMCIA specifies a 68-circuit 1.27 mm pitch dual row connector as the mating interface. The card receptacle has a metal plate with eight dimples. The header has eight spring members. The connector system provides an additional eight grounding paths to standard PC card connectors.
Containers that provide compact packaging of PCBs. They are sized differently and hold varying numbers of cards. They allow heat dissipation and sophisticated models incorporate a ground plane with connectors and DIP devices to take advantage of highly automated back panel wiring techniques.
A Level 2 two-piece connector also called a Post-and-Box connector used to join a motherboard and a daughterboard or wire assembly. Not to be confused with a one-piece card edge connector.
A one-piece card connector that is mounted directly on the motherboard. Contact fingers on the daughterboard are inserted into the contact pads of the card-edge connector. Card edge connectors for single-sided boards are called single-readout; those for double-sided boards are called dual-readout.
A plastic or metal support for printed boards. It relieves the stress on connector contacts; makes insertion into, and extraction from, the connector easier, and eliminates the possibility of twisting the board.
The lengthwise opening in a printed circuit edge connector that receives the printed circuit board.
The metal strip to which stamped parts are attached as they pass through the manufacturing processes.
In extrinsic semiconductors, the majority of charged carriers creating the current, which could be either the negative electric charges (electrons in n-type materials), or the positive electric charges (holes in p-type materials), respectively.
In extrinsic semiconductors, the minority of charged carriers creating the current--in n-type materials, the positively charged holes; in p-type materials, the negatively charged electrons.
See also Semiconductor Materials.
Metallized feature that is recessed on the edge of chip carrier used to interconnect conducting surfaces or planes within or on the chip carrier.
Terminal concept allowing for two points of contact that causes a higher normal force.
A substance that can initiate and/or accelerate a chemical reaction but remains chemically unchanged by that reaction.
The negative electrode or pole of a plating cell to which positively charged metal ions are attracted to and deposit there from the plating bath. In a battery or external circuit, the pole which receives electrons from the anode of the external circuit after completing the internal circuit of a plating cell, for example.
The natural electrochemical or galvanic protection of one metal against corrosion or oxidation at the expense of another, i.e., a sacrificial metal. For example, since steel is electronegative compared with zinc, a galvanized steel part, (i.e., a steel part plated or clad with zinc), will be protected environmentally from oxidation or corrosion by the steel becoming the cathode in the electrochemical cell of zinc/steel, where preferentially the zinc as the anode will oxidize or corrode, protecting the steel as a cathode or a reducing electrode rich in electrons.
The initials stand for Community Antenna Television, which is what it is still called in Europe. Known in the US as Cable Television.
CB
CBO
Neoprene insulated brewery cord.
Charged Coupled Device
Consultative Committee for International Telephony and Telegraphy. The primary international standards organization for the telecommunications industry.
Closed-circuit television
CE stands for "Communautee Europeene" or "European Community." CE Certification is an industry standard throughout Europe to help create a European market in which it is easy to trade between member states.
The CE mark on a product is the declaration by the supplier that they have complied with all the directives that apply to their product and cannot be refused access to the markets of EU Member States.
A distributive system that uses the space between a real ceiling and a suspended ceiling below it.
A single unit that produces a voltage (causing a direct current) by converting chemical, nuclear, solar, or thermal energy into electric energy.
Cellular telephone is a type of short-wave analog or digital telecommunication device in which a subscriber has a wireless connection from a mobile phone to relatively nearby transmitter. The transmitter's span of coverage is called a cell. Generally, cellular telephone service is available in urban areas and along major highways. As the used moves from one cell area of coverage to another, the telephone is effectively passed on to the local cell transmitter.
Expanded or "foam" polyethylene, consisting of individual closed cells of inert gas suspended in a polyethylene medium, resulting in a desirable reduction of dielectric constant.
A switch that has the moving contact closing the circuit at either extreme of its travel, but leaves both open in its center position.
See Pitch.
The space between leads.
A telephone company facility for switching signals among local telephone circuits; connects to subscriber telephones. Also called a switching office. Outside of the US this equipment location is generally referred to as an exchange.
Telephone company offering that provides service similar to that obtained using a PBX. The service is provided by the telephone company's central office switch.
CERamic DIP. A hermetic ceramic DIP package made of two ceramic pieces with a built in cavity sealed together using a melted glass frit.
Certificate of Compliance (COC)
Formal recognition that an item is approved for addition to the Qualified Parts List and conforms to military regulations.
Verification that specified testing has been performed, and required parameter values have been attained.
Conductive Elastomer Technology
