DAMMP3C3PJ datasheet(277/301 Pages) ITT

277 / 301 page

Dimensions are shown in mm (inch)

Dimensions subject to change

D Subminiature

Glossary of Terms

In every job speciality there are certain words and

phrases used by the ‘‘insiders’’ which after a time

become almost a language unique to that

speciality. D Subminiature technology is a typical

example of that condition.

The following pages provide some explanations, in

an attempt to clarify some of the terms that are

commonly used by engineers and sales staff at ITT

Cannon.

The list is not comprehensive, but highlights many

of the expressions commonly used. Should you

have any comments or additions please contact

us. Feedback will be appreciated.

Accelerated Aging — A connector test in which

temperature, voltage, current, or other parameters

are increased beyond the normal operating values

to observe deterioration in a relatively short period

of time.

Accessories — Auxiliary devices such as cable

clamps, endbells, gaskets, or any number of

mechanical hardware devices that can be added to

a connector.

Alloy — A composition of two or more elements,

of which at least one is a metal. In connector

applications it is usually a combination of metals

which is used to create an alloy superior in

performance to any of its individual components.

Alternating Current — A flow of electricity which

reaches a maximum in one direction, decreases to

zero, then reverses itself and reaches maximum in

the opposite direction. This cycle is repeated

continuously. The number of such cycles per

second is the frequency. The average value of the

voltage during any cycle is zero. Abbreviated ac.

Ambient Temperature — The temperature of the

environment surrounding the connector. Usually

the air. Normally used as the reference when

specifying the OPERATING TEMPERATURE range

of the connector.

Ampere — A unit of electrical current or rate of

flow of electrons. One volt across one ohm of

resistance causes a current of 1 ampere.

Abbreviated Amp or A.

Anodize — A protective, insulating oxide layer

formed on a metal by electrolytic action.

Occasionally used as the outer most layer in

connector plating, anodize is a very tough, non-

conductive plating.

Attenuation — Power loss in an electrical system,

expressed in decibels.

AWG — American Wire Gauge. A standard for wire

diameters based on the approximate circular mil

area of the wire. As numbers get larger, wire

diameters decrease in size (a size 16 AWG wire

has a larger diameter than a size 22 AWG).

Backshell — (Also known as Endbell) The outer

rear end of the connector which is attached by

means of internal threads or screws. It adapts the

connector to its wire connections in a variety of

ways. Typical backshells might have cable clamps

to secure a wire bundle, ridges for heat shrink

tubing, pipe threads, or shielded termination

mechanisms. Backshells may be straight, 90

°, or

°.

Bandwidth — The range of frequencies within

which performance falls within specific limits.

Usually the bandwidth is given as an operating

range and the operating specifications apply only

to that bandwidth, unless otherwise stated.

Bar — A centimeter-gram-second unit of pressure

(force exerted on a unit of area) equal to 1,000,000

dynes per square centimeter. Formerly known as

microbar. Its symbol is b.

Base Metal — The metal which the connector or

connector component is made and over which

various platings will be deposited.

Beryllium Copper — An alloy of copper used to

make contacts. It is relatively expensive, but has

superior spring qualities, is resistant to fatigue, and

can operate at higher temperatures than other

materials such as phosphor bronze. It is used

when numerous insertion and extraction cycles

are required.

Body — The main portion of the connector made

of the shell, insulator, and contacts.

Boot — A rear accessory, usually made of a

resilient material, which is used around a

multiconductor cable to add additional insulation,

strength, abrasion resistance, or sealing.

Brass — Metal alloy of copper and zinc used for

contacts. It is low cost, an excellent conductor,

and resists fatigue.

Breakdown — An electrical discharge through a

connector insulator or insulation on a wire. A

catastrophic failure mode.

Breakdown Voltage — The voltage at which an

insulator ruptures.

Breakout — The point at which wires are

separated from a multi-conductor cable or wire

bundle for routing to other points.

C — Abbreviation for Centigrade, or more properly

Celsius, since the term Centigrade was officially

abandoned by international agreement in 1948.

See CELSIUS.

Cable Assembly — A cable (or bundle of cables)

with plugs and/or receptacles on each end.

Cable Clamp — A rear connector clamping

accessory which tightens over a cable or wire

bundle to provide strain relief to the cable. The

cable clamp may be part of a more elaborate

endbell or it may be used alone. Some cable

clamps also provide cable jacket sealing using a

resilient gland; for example the MS3057-C, others

provide only strain relief.

Cadmium — A metallic element chemically

related to zinc and mercury, widely used for

plating. It has an extraordinary ability to resist

outdoor corrosion. It is especially resistant to

alkali. Cadmium is electrically conductive and it is

easy to solder. Its symbol is Cd.

CECC — Abbreviation for Electronic Components

Committee of CENELEC, the European committee

for Electrotechnical Standardization. CECC uses

the IEC test methods, and thus is based upon

worldwide standards.

Celsius — A temperature scale in which the

freezing point of water is 0

° and the boiling point is

100

° at normal atmospheric pressure. Formerly

known as Centigrade, but officially changed to

Celsius by international agreement in 1948.

CEN — Abbreviation for European Committee for

Standardization. A European standards group

corresponding to the ISO at the European level.

CENELEC

—

Abbreviation

for

European

Committee for Electrical Standardization. A

European standards group corresponding to the

IEC at the European level.

Chamfer — A bevel cut on the inside edge of an

insulator contact cavity or a mounting hole. In a

contact cavity the chamfer is intended to guide the

mating pin into the cavity. In a mounting hole it is a

countersink to accept a cone shaped bolt.

Characteristic Impedance — The characteristic

impedance of a transmission line is the impedance

of the line when it is terminated in a perfect load (a

load that absorbs all the energy and reflects none,

such that VSWR

= 1.00).

Clearance Hole — See Through Hole.

Closed Entry — An insulator design which limits

the diameter of the mating contacts.

276

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