SR

Silicone rubber control cable. 600 in, 125º C.

SR-AW

Flexible, nickel plated copper conductor, silicone rubber insulation, glass braid. 600 in, 200º C.

SR-C

Solid copper conductor, silicone rubber insulation, glass braid, 600 in, 200º C.

SR-H

Silicone rubber insulated, asbestos braid. 500 in, 125º C.

SRAM

Static Random Access Memory. A type of RAM that is volatile because it loses its contents whenever the source of power is removed. It does not have to have its contents continuously refreshed as does DRAM. It is faster than DRAM. SRAM is more expensive than an equivalent amount of DRAM.

SSA

Serial Storage Architecture. An industry standard for a bus and interconnect system typically used for connecting storage devices in servers and PCs. This standard uses a high-speed (Gbit/second) serial data path.

SSEC

Single Sided Edge Connector

See Edge Connector.

SSMS

Safe Sequential Mating System. A Premium line DIN 41612 system that is an alternative to FMLB extended pins (for early grounding) and multi-purpose DIN 41612 connectors with signal and power in same housing.

ST

Extra hard service cord, jacketed, all plastic construction. 600 in, 60º C, 75º C, 90º C, 105º C ratings, 2-18 AWG, 2 or more conductors.

Stability

The ability of a device or circuit to attain and hold a steady level of operation under several varying external conditions such as temperature, frequency, voltage, or other mechanical changes.

Stackable

The ability to place symmetrical housings/assemblies side-by-side and where the distance from the last contact in one assembly to the first contact in the next assembly is equal to the distance between any two contacts in the assembly itself.

Stacking

Installation of two or more terminals on a single screw or stud.

Stamped and Formed Contacts

A style of contact that can be single-beam or double-beam.

Stamped Contacts

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

Stamping Die

A tool that cuts and forms a flat strip of metal into connector contacts. A single die is usually dedicated to a single product group.

Stamping Press

A machine that runs stamping dies to create contacts. Capacity of these machines is usually measured in tons. The most common presses used in Premium line are terminal presses and pin presses.

Stand Alone Terminals

Crimp terminals for single cable application that need to be permanently fixed to a PCB.

Stand Off

Tiny spacers built into a housing to raise the housing from a PCB surface.

Standard High Voltage

See SHV.

Standing Wave

The apparent stationary pattern of waves produced by two waves of the same frequency traveling in opposite directions on the same transmission line. The existence of voltage and current maximum and minimum along a transmission line is a result of reflected energy from an impedance mismatch.

Standing Wave Ratio (SWR)

A ratio of the maximum amplitude to the minimum amplitude of a standing wave stated in current or voltage amplitudes. Also known as Voltage Standing Wave Ration (VSWR) or Current Standing Wave Ratio (ISWR).

See also Structural Return Loss.

Static Charge

An electrical charge that is bound to an object. An unmoving electrical charge.

Stay Cord

A component of a cable, usually a high tensile textile, used to anchor the cable ends at their points of termination and to keep any pull on the cable from being transferred to the electrical connections.

Step-plane

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

Stereo_Lithographic_Apparatus

See SLA.

Sticking Force

The force necessary to disconnect the two halves of a connector at zero applied load, usually exhibited by connectors with noble metal platings.

See also Withdrawal Force.

Stick(s)

Several parts (depending on circuit size) of the same product joined together on carrier.

Stiffener

A device, generally made of metal, used to secure together components of a modular connector system.

Stitcher Machine

An assembly machine that inserts (stitches) one pin/ terminal at a time into its housing. The rate of production is directly related to the circuit size of the product. Stitcher speeds range from 100-400 SPM (strokes per minute).

STM-N

Nth level synchronous transport module frame structure in the Synchronous Digital Hierarchy (SDH).

STO

Same as ST, but with oil resistant thermoplastic outer jacket. 600 in.

Stock

Differences in thickness of terminal material.

Stop Plate

Device attached to a crimping tool to properly locate a terminal, splice or contact in the tool prior to crimping. Also called locator.

Storage Area Network (SAN)

A high-speed, special-purpose network (or sub-network) that interconnects different kinds of data storage devices with associated data servers on behalf of a larger network of users.

STQ

Signal Transmission Quality.

Straddle Mount

A connector configuration in which a two row connector mounts to the edge of a PCB with one row of back end terminal tails on each side of the PCB. The connector is usually an edge card type connector.

Straight Connector

A connector that joins two lengths of conductor end-to-end in a straight line.

Straight Coupler Connector

A straight connector that joins two conductors of unequal sizes end-to-end in a straight line.

Straight Reducer Connector

A straight connector that joins two conductors of unequal sizes end-to-end in a straight line.

Strain Damage

The disconnection of conductors from their termination points due to a sharp pull on the cord.

Strain Gauge

A device for determining the amount of strain (change in dimensions) when a stress is applied.

Strain Relief

Any of several protective techniques used to reduce the transmission of mechanical stresses to the critical conductor termination. Usually designed into the termination or installation process. The strain relief device takes up the applied mechanical stress and strain.

Strain Relief Clamp

An adjustable collar, usually secured by a nut and bolt, that clamps the wire or cable attached to the connector to relieve the strain on the contact terminations. Also called cable clamp.

Strand

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

Stranded Conductor

A conductor composed of a group of wires or of any combination of groups of wires. The wires in a stranded conductor are usually twisted or braided together.

Stranded Tinned

Individual tinned copper wires, twisted together, plus insulation.

Stranded Topcoat

A number of bare copper wires twisted together and then coated with tin.

Streamlined

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

Strength Member

A part of a fiber optic cable used to support the fiber during its installation. May be composed of special yarns, steel strands, or fiberglass filaments.

Stress-rupture Test

A soldered joint test performed under constant stress at the solder joint. Records the time to joint failure at a given load.

Strip

  1. To remove insulation from a cable.
  2. Strip contacts, or a continuous length of formed contacts for use in an automatic installation machine.

Strip and Retain

Round ribbon cable that is stripped but not completely removed from the conductor. This prevents damage during shipping and handling.

Strip Contacts

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

Strip Length

The length of insulation that must be removed from a cable prior to crimping.

Strip Terminal

A terminal supplied in continuous form for use in automatic or semiautomatic crimping machines. Also called tape terminal.

Stripe Plating

A stripe (2-4 mm wide) that is plated on one side across the surface of a raw material strip. The rest of the surface is usually nickel-plated.

Stripline

Similar in design to a Microstrip except with two plane conductors (ground current return paths) sandwiching a dielectric having at its center a signal conductor (a narrow metal strip). Very effective shielding of the signal line is achieved with this almost "closed" transmission line design.

Structural Return Loss

The dB expression of the ratio of the reflected power to the incident power (1% reflected power = -20 dB Return Loss); and also correlated to the SWR or VSWR value of a transmission line system.

See also Return Loss, Standing Wave Ratio, VSWR.

Stubbing

A mismating of two terminals in which one collides head-on with the other. Also known as butting.

Stud

Threaded or serrated insert or post used for connecting wires or terminals.

Stud Angle Terminal Connector

A connector that joins a conductor to the round terminal stud of electrical apparatus at a specified angle.

Stud Hole

The hole or opening in the tongue of a terminal, which accommodates a screw or stud.

Stud Terminal Connector

A connector that joins a conductor to the round terminal stud of electrical apparatus.

Stud-type Board

Terminal board used for connecting conductors or terminals using binding posts or stud terminations.

Stuff

See Ramp.

Stuffing

Assembly of components on a PCB.

Subassembly

A component of an electronic product.

Subminiature D Connector

A rectangular input/output electronic interconnect device with contacts in a D-shape configuration. Commonly used in computers and computer peripherals.

Substrate

The supporting insulating material upon which parts, substances, or elements are deposited and/or attached.

Suppressor

A device used to reduce or eliminate unwanted actions in electric or electronic circuits. For example, a resistance conductor in a sparkplug cable suppresses interference that would otherwise affect radio reception in and near the vehicle.

Surface Conductance

Conductance of electrons along the outer surface of a conductor.

Surface Leakage

The passage of current over the boundary surface of an insulator.

Surface Mount

See SMT.

Surface Mount Automated Placement Equipment

Equipment used to place surface mount components onto a PCB. Common types include:

Surface Mount Compatible (SMC)

See SMC, SMT.

Surface Mounted Device (SMD)

Components housed in small or minimum size packages that have short leads or no leads at all, and mount on the surface of a PCB without holes for leads. SMDs include integrated circuits, resistors, diodes, capacitors, and transistors.

Surface Mounting

See SMT.

Surface Mount Technology

See SMT.

Surface Resistivity 

The resistance of a material between two opposite sides of a unit square of its surface. It is designated by the symbol . Surface resistivity is often termed "Ohms per Square," with actual units of dimensions as Ohms equal to "Volume Resistivity/Unit Layer Thickness" of the effective conducting surface layer of the substrate. Surface resistivity may vary widely with the conditions of measurement.

See also Ohms Per Square.

Surge

A temporary and relatively large increase in the voltage or current in an electric circuit or cable. Also called transient.

Surge Current

The maximum peak current that a switch can carry in its closed position without impairing performance.

SV

Vacuum cleaner cord, two-or three-conductor, rubber insulated. Overall rubber jacket. 300 in, 60º C, 18 AWG.

SVO

Same as SV, neoprene jacket, 300 in, 60º C, 75º C, 18 AWG.

SVT

Same as SV, all plastic construction. 300 in, 60º C, 75º C, 90º C, 18 AWG.

SVTO

Same as SVT, oil resistant thermoplastic jacket, 60º C°, 75º C, 90º C, 105º C.

Swaged Leads

Component lead wires that extend through the PCB and are flattered, or swaged, to secure the component to the board during manufacturing operations.

Swamp

The condition that prevails when an excessive signal is applied to an electronic device, resulting in distortion of the output.

Sweeptest

A test that checks frequency response by generating an RF voltage with a frequency that is varied back and forth through a given frequency range at a rapid constant rate. Results are observed on an oscilloscope.

In CATV applications, a structural return loss sweeptest determines internal reflections in the cable. A high structural return loss is desirable.

Switch Connector

Premium line terminology for a micro switch or limit switch. An automotive door courtesy light and refrigerator door light are examples.

Switches

Devices that make or break connections in an electrical or electronic circuit.

In computer systems, switches are also used to make selections.

Switching Current Rating

The designated RMS current that a loadbreak connector can connect and disconnect for a specified number of times under specified conditions.

Synchronous

Describes a device or system in which all events occur in a predetermined timed sequence. Terminals can be designed to function in a synchronous or asynchronous mode.

System Unit (SU)

The modular sizing that a connector system is based upon.

In Premium line's OmniGrid 2.5 mm system, for example, one SU is 25 mm long by five rows high.