Connectors 101

Connectors 101

# A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
There are 82 names in this directory beginning with the letter S.
The feature of connector design that permits safety wiring of plug and/or receptacle to prevent loosening or vibrating free of plug from receptacle.

Scattering Parameters (S-Parameter), S11, S12, S21, S22
S11 is the reflection coefficient at the input port of the device under test, defined as the ratio of the reflected voltage to incident voltage. S12 is the reverse transmission coefficient (isolation), The 12 is derived from the signal appearing on the input port ( port 1) from signal applied to the output port (port 2). S21 is the forward transmission coefficient (gain), S21 are signals on the output (port 2) of the device under test, resulting from signals applied to the input (port 1). S22 is the output reflection coefficient as defined by the ratio of the incident voltage to the reflected voltage. The above S-parameters are for single ended systems. S-parameters are frequency dependent, and are by default normalized to 50 ohms. There are additional parameters for differential systems.

Scoop Proof (Scoop-Proof)
A design feature whereby exposed contacts of a connector cannot be inadvertently touched or damaged by any portion of the mating connector.

Screw Lock

Screw Machine Contacts
A contact made by screw machine operations.

A technique to prepare fibers for termination in which fibers are lightly scribed, then pulled apart to produce cleavage perpendicular to the fiber axis.

Seal, Interfacial
A seal provided at the interface of a connector designed to prevent fluids or other contaminants from entering the connector contact area.

Sealed Connector
A connector employing a seal capable of fulfilling specified gas tightness requirements.

The ability of a component to resist the ingress of contaminants.

Sealing Plug
A plug that is inserted to fill an unoccupied contact aperture in a connector insert. Its function is to seal unoccupied apertures in the insert, especially in environmental connectors.

Secondary Insulation
A nonconductive material whose prime functions are to protect the conductor against abrasion or other mechanical degradation and provide a second electrical barrier, placed over the primary insulation.

Selective Plating
The application of plating to a limited portion of a connector contact, especially those areas susceptible to wear.

Design of two mating parts so that they will engage in the proper relative position.

The inductance of a single conductor.

Alterations of the inside surface of a conductor barrel to provide better gripping of the conductor, or on the outside of a connector housing, to provide better gripping of the connector; protrusions on the rear of a connector housing for positive orientation of accessories.

Service Life
The period of time that a device is expected to perform satisfactorily.

Service Rating
The maximum voltage or current conditions of which a connector or electrical device is designed to function continuously at a specified temperature.

Cylindrical or rod-like portion of a connector or contact.

The outside case of a connector into which the insert and the contacts are assembled.

Shield, Electrical Connector
A device placed around that portion of a connector that is used for attaching wires or cables so as to both shield against electromagnetic interference and/or protect the connector wires or cable from mechanical damage.

Shielded Cable
One or more wires enclosed within a conductive shield to minimize the electrical interference effects of internal or external circuits.

Shielded Connector
A connector designed to prevent the radiation of electromagnetic interference to and from the internal conductor(s).

The metal sleeving surrounding one or more of the conductors, in a wiring circuit to prevent interference, interaction or current leakage to an adjacent wire. Usually grounded, the shielding is carried through the connector shell or through a special internal shell in the case of individual coaxial contacts.

Shore Hardness
A procedure for determining the indentation hardness of a material by means of a durometer. Shore designation is given to tests made with a specified durometer instrument.

Shrink Fit Connector
A type of connector in which the contact between the conductor and the connector contact is made by a shrink fit.

Shroud, Insulation
A part of a connector or device that provides physical protection to otherwise exposed contacts or terminals.

Single Hole Mounting
A method of mounting a component that has a shoulder and a captivating device, and installed through a single hole in a panel.

Sizing Tool
A tool simulating a specified maximum size male contact or a specified minimum size female contact.

The difference in propagation delay between two signal paths.

Skid Washer
A washer sometimes fitted between a clamp-nut and a pressure-sleeve, to reduce the transmission of torque to the pressure-sleeve.

A socket contact that is simply a conductive tube. Sleeves do not contain pin grips or any other amendments and are usually used with split pins.

Slotted Tongue Terminal
A terminal, having a bifurcated tongue, that allows attachment to a screw or stud without removal of the mounting hardware.

Used to describe the easy removal or assembly of one part to another. Example: certain connectors are provided with snap on plastic covers to permit quick and convenient installation.

Snap-On Contact
A push on contact in which retention is achieved by means of a deformation of the contact area that provides positive axial location.

A connector intended to mate with a plug in device such as tubes, relays, transistors, microcircuits, etc.

Socket Contact Sleeve
A sleeve that holds the contact spring in the correct position within the socket contact.

Socket or Receptacle Contact
A contact designed to interconnect with a pin contact, generally, by capturing or surrounding it.

An alloy that melts at relatively low temperatures, and that is used to join or seal metals with higher melting points.

Solder Connection
A connection made by soldering.

Solder Contact
A contact designed for the attachment of the conductor by solder.

Solder Cup
The cup or well at the end of a contact or terminal into which a wire is inserted prior to being soldered.

Solder Eyelet
A solder type contact provided with a hole at its end through which a wire can be inserted prior to being soldered.

Solder Flux
A substance that transforms a passive, contaminated metal surface into an active, clean, solderable surface.

Solder Projection
An undesirable protrusion of solder from a solidified solder joint or coating.

Solder Sleeve
A heat shrinkable tubing device containing a predetermined amount of solder and flux used for environmental resistant solder connections and shield termination.

Solder Type Connector
A connector in which the contact between the conductor and the connector is made by a solder joint.

The property of a metal to be wetted by solder.

Solderless Connection
The joining of two materials by pressure means without the use of solder, brazing or any method requiring heat.

Solderless Contact
A contact with a termination portion that is a hollow cylinder to allow it to accept a wire. After a bared wire is inserted, a swaging tool is applied to crimp the contact metal firmly against the wire. Usually called a crimp contact.

Solderless Wrap
A technique of connecting uninsulated solid wire or stripped insulated wire to a terminal post containing a series of sharp edges, by winding the wire around the terminal. (see WIRE-WRAP)

Solid Press-In Termination
A press-in termination having a solid press-in section.

The lowest temperature at which a metal alloy begins to melt.

Spade Tongue Terminal

Specimen Environment Impedance
The impedance presented to the signal conductors of the device under test by the test fixture. This impedance is a result of transmission lines, termination resistors, attached receivers or signal sources, and fixture parasitics.

A device used to join two or more conductors or optical fibers to each other.

Spring Contact
A contact having elastic properties to provide a force to its mating part.

Spring Finger Action
Design of a contact as used in a printed circuit connector or socket contact, permitting easy stress free spring action to provide contact pressure and/or retention.

The installation of two or more terminals on a single screw or stud.

Staggered Contact Connector
A connector having a staggered arrangement of the terminations and/or the contacts.

Stake Contact
A contact for individual mounting to a printed board by staking, and normally soldered to a land.

Stamped Contacts
Contacts made by stamping and bending sheet metal rather than by machining of metal stock.

Step Amplitude
The voltage difference between the 0% and 100% levels, ignoring overshoot and undershoot.

An internal keying-type device incorporated into plugs and receptacles allowing the connector to be mated only one way. The connector is rotated until the step-planes match; then it is pushed together.

Stop Plate

Straddle Mount
A method of mounting a connector or other electrical element to a circuit board or other similar member such that the connector contact elements can be attached to both opposing surfaces of the circuit board, with the connector mounting means straddling both sides and the edge of the circuit board.

Strain Relief
A technique involving devices or methods of termination or installation, that reduce the transmission of mechanical stress to the conductor termination.

Strain Relief Clamp
A clamp designed to remove the strain of a cable pulling on the connector’s contacts. Strain reliefs may be attached to the connector or may be part of a cable support system.

Strain Relief Slot (IDC)
The specially shaped opening in an insulation displacement termination suitable to provide for strain relief.

One of the wires, or groups of wires, of any stranded conductor.

Design of high voltage connectors to eliminate sharp points or corners and to recess all hardware to reduce corona discharge.

The removal of insulation material from wire or cable.

Strip Contacts
A continuous length of formed contacts for use in an automatic installation machine.

Strip Terminal
A contact or terminal supplied in some means of continuous form, for use in automatic or semiautomatic crimping machines.

A tool or chemical used to remove insulation material from wire or cable.

Stripping Force (Wrap Post)
The amount of force required to be applied to the wrapped connection along the major axis of the post to move the wrapped conductor sufficiently to break the gas tight union of the contact area.

A post used for connecting conductors or terminals. It may be threaded, serrated or plain.

Stud Hole
The hole or opening in the tongue of a terminal lug that is intended to accommodate a screw or stud.

Stud Type Board
A terminal board used for connecting conductors or terminals by means of binding posts or stud terminations. (see TERMINAL BOARD).

Submersible Connector
A connector capable of withstanding submersion to a specified depth.

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

Surface Mounting
The electrical connection of components to the surface of a conductive pattern without utilizing component holes.

The mechanical reshaping of barrels; an obsolete term for crimping.