) that represents a statistical measure called Standard
Deviation. A contact style in which the female contact mates with the flat, wide side of a male connector.
The Greek letter () that represents a statistical measure called Standard
Deviation.
For example, for a Gaussian or normal distribution of data, the expression
written about the mean or average (µ) of the data ( [µ ± 3] ) means that that 99.73 % of
the total data (y-variable) fall within this range window (x-variable) ; at the
value of = 2 it
is 95% of the data; and at = 1 it is 67% , respectively.
An individual conductor used to transmit an impressed signal.
A sharp or fast signal edge means a signal waveform with a short zero rise time or equivalently an infinite slew rate.
See also Rise Time, Slew Rate.
Signal Velocity of Propagation
See Vp.
Signal Integrity.
The broadening or decrease in the slope of the signal's Voltage--Time waveform (i.e., its sharpness and edge speed) that increases the rise time of the signal usually due to reflective noise, attenuation, and/or dielectric skew and loss.
See also Characteristic Impedance, Discontinuity.
A conductor layer intended to carry signals, rather than serve as a ground or other fixed voltage function.
A semiconductor material used to fabricate electronic devices such as diodes, transistors, integrated circuits, and photovoltaic devices.
See also Semiconductor Material.
Silicon Carbide Reinforcement (SiC)
A potential low cost, high performance filament, suitable for advanced metal matrix applications. The SiC filament is produced in a manner similar to the boron filament using chemical vapor deposition (CVD) on to continuous substrates.
Silicon Controlled Rectifier (SCR)
A three-junction semiconductor device that is normally an open circuit until turned on, at which time it rapidly switches to a conducting state in one direction only. Formal name is reverse-blocking triode thyristor. Terminals are called anode, cathode, and gate.
A material made from silicon and oxygen. Can be in thermosetting elastomer or liquid form. The thermosetting elastomer form is noted for high heat resistance.
A highly conductive metal with atomic number 47. When applied as terminal plating, it provides a hard-oxide, soft-base finish that requires only moderate pressure for a metal-to-metal contact. Silver plating is normally used on metals that are relatively good conductors, such as copper and brass. Silver is primarily used in power connectors.
Subscriber Identification Module. Each GSM mobile phone requires a SIM card. The SIM card is a personalized identification card used for security and billing purposes.
Single In-line Memory Module. A Premium line electronic interconnect device designed to allow high-density memory of a million bytes or better on a minimum of board space. SIMM devices engage contacts by rotating module to a maximum stop.
A socket used to connect a SIMM to a PCB.
Single element as in a single fiber cable or single fiber connector.
See Surface Mount Automated Placement Equipment.
An alternating wave form whose instantaneous value is related to the trigonometric sine function of time or angle.
A stamped-and-formed contact in which the female contact holds the male contact between itself and the housing wall. Contrasted with a dual beam contact (bifurcated design), which holds the contact with two beams.
See also Dual Beam.
See SIMM.
See SIP.
An optical waveguide (or fiber) in which the signal travels in one "mode." The fiber has a small core diameter and the light path is one of minimal reflections.
Contact arrangement in which all contacts connect to one common contact.
Single Pole, Double Throw (SPDT)
A three-contact switching arrangement that connects a circuit to one of two alternate connections.
Single Pole, Single Throw (SPST)
A two-contact switching arrangement which opens or closes one circuit; the circuit may be normally open or normally closed.
A term that refers to a board-to-board connector designed for single-sided PCBs.
Unbalanced transmission line having one signal conductor and one ground current return path.
See also Balanced Line.
Solderless terminal that allows a crimp to the wire only.
See also Double-Grip Terminal.
A socket characterized by a single row of external connecting terminals, or pins, which are suitable for insertion into the holes of the PCB. SIP's low profile conserves PCB real estate.
Hard service, rubber insulated pendant or portable cord. 300 in, 60 or 75° C rating, 18-l0 AWG, 2-6 conductors.
Same as SJ, neoprene, oil resistant compound jacket, 300 in, 60° C, 75 or 90° C rating, 18-10 AWG, 2-6 conductors.
Hard service thermoplastic or rubber insulated conductors with overall thermoplastic jacket, 300 in, 60° C, 75° C, 90° C, 105° C rating, 18-10 AWG, 2-6 conductors.
Same as SJT, oil resistant thermoplastic outer jacket.
The difference in time it takes for signals to arrive at the receiver.
In fiber optics, a ray that never intersects the axis of a fiber while being internally reflected, in contrast with a meridional ray.
The tendency of dynamic current (AC or transient), with increased frequency, to travel within a thinner and thinner outer "skin" of the cross-section of a conductor, increasing correspondingly the AC resistance of the circuit with frequency.
Stackable Linear. A Premium line single row, fully stackable connector system which is an extension of the C-Grid range.
Stereo-Lithographic Apparatus. An apparatus using typically lasers together with a special sensitive curing polymer liquid. A CNC (Computer Numerically Controlled) program allows the three dimensional fabrication of very complex prototype parts within a short period of time.
An insulated or metallic covering over a terminal barrel.
Refers to the rate at which the output of a system or op amp can be driven from one end of its dynamic range to the other end. Usually expressed in volts per microsecond. For signal waveforms, the slew rate is the rate or the slope of the full voltage swing value divided by the rise time Trise, assuming a linear ramp of the signal waveform to its full maximum voltage value.
See also Rise Time.
A switch controlled by a sliding button on the face of the switch.
A naked header with a protective cover that is dispensed with once the header has been attached to a PCB. The cover protects the pins.
A terminal with a slot, rather than a hole, in the tongue. The slot permits the terminal to engage and disengage from a stud without completely removing the nut.
Premium line fiber optic connectors that are specially designed for multimode data communication applications. Premium line SMA connectors are fully compatible with existing SMA 905 hardware.
The connector is designed using the latest ceramic, metal and engineering polymer materials. Consistent field terminations are easily achieved with the unique Premium line termination process and the connector's pre-polished ceramic ferrule. This connector is available with either metal or polymer coupling nuts.
A through-hole connector which is manufactured from a high temperature material, thereby making the connector suitable to withstand the high temperatures of vapor phase or I/R reflow soldering processes.
See also SMT.
Switched Multi-megabit Data Service. A fast, connectionless, packet-switched telephone service. SMDS is "connectionless" in that every packet has an address field and can be independently routed to its source. Frame Relay and X.25 are connection-oriented services in that the first packet transmitted sets up a connection between the sending and receiving point over which subsequent packets are transmitted.
Surface Mount Technology. The general technology related to mounting components on the surface of a carrier. SMT is sometimes referred to as SMC, but they are different processes. The difference between SMT and SMC is that SMC uses through-holes, whereas SMT uses solder tails. Both techniques require that the connector be made of high-temperature plastic. The housings must be able to withstand the high temperatures of soldering.
There are three types of SMT processing:
A contact actuating mechanism that produces a high velocity transfer of the moveable contact from one extreme to the other.
Pegs that give a positive lock between the header and the PCB prior to the wave soldering operation.
A style of package-to-board socket that can be snapped or broken into different sizes.
