DAMMP3C3PJ datasheet(279/301 Pages) ITT

279 / 301 page

Dimensions are shown in mm (inch)

Dimensions subject to change

D Subminiature

Glossary of Terms

EN — Abbreviation for Euro Norm. A European

market-wide product standard.

Endbell — See BACKSHELL.

Extraction Tool — A device used to remove a

(removable) contact from a connector insulator.

The extraction tool may be inserted into the mating

face of the insulator (FRONT RELEASE) or the wire

side (REAR RELEASE). In either case, the contact

comes out the rear, or wire side, of the connector.

Fahrenheit — A temperature scale in which the

freezing point of water is defined as 32

° and the

boiling point is 212

° at normal atmospheric

pressure. See the conversion tables for converting

Fahrenheit to Celsius. Abbreviated F.

Female Contact — See SOCKET CONTACT.

Ferrule — A bell shaped ring which is placed over

a WIRE SEALING GROMMET to provide uniform

axial compression of the grommet and to minimize

the transmission of torque to the grommet when

the backshell is screwed on to the rear of the

connector. Ferrules are a part of the sealing

mechanism at the rear of a connector. Ferrules are

normally a separate component part of the

connector although some backshells have

integrated ferrules. Ferrules are usually made from

a thermoplastic material, but occasionally ferrules

are made of metal.

Finish — The metalic coatings used on contacts

and metal connectors. These are thin layers of

metal

designed

improve

conductivity,

solderability, or to resist corrosion. Typical contact

finishes are gold or silver. Typical shell finishes are

olive drab over cadmium, electroless nickel, or

black anodize.

Flange — A square mounting flange with four

mounting holes for bolting the connector to a

panel. The mounting holes may be through holes

or threaded.

Flanged Receptacle — (Also known as a Box

Mount or Wall Mount) The shell of this connector

has a square flange with mounting holes at each

corner. Mounting holes are usually through holes,

but may be threaded. Flanged receptacles can

usually be front or rear panel mounted depending

upon panel thickness. Some connectors have two

different versions, one for front mounting, and one

for rear panel mounting.

Flash Plating — As commonly used in connector

terminology, flash refers to extremely thin platings

of metal, for example: gold flash is a very thin

plating of gold. So thin, that the thickness is

generally not specified.

Front Mounting — A receptacle that can only be

mounted to the front of a panel with its mounting

FLANGE outside the equipment.

Front Release — For crimp type removable

contacts, front release means that the appropriate

extraction tool is

inserted from the front, or mating

face, of the connector. The contact is then pushed

out the

rear (wire side) of the connector.

Gas Tight — The mating of two contact surfaces

which are so tight that corrosive gasses can not

enter the joint.

Gold — A precious metal that is more conductive

than silver or copper. Because it does not corrode

and is highly conductive, it is used as plating for

contacts. Its chemical symbol is Au.

Grommet Cavity — A defined hole in the WIRE

SEALING GROMMET through which the wires are

passed. The cavities are generally marked with a

unique designation or number for ease of use.

Guide Pin — A special pin which is inserted into a

socket contact before the contact can be inserted

into the connector insulator. Guide pins provide a

rounded surface at the front of the socket and

greatly aid in pushing the contact into the insulator

thus avoiding damage to both the insulator and the

contact. Typically, small size socket contacts

require the use of guide pins while larger sizes can

be inserted without them.

Harness — A group of wires or cables bundled

together

with

attached

connectors

and/or

components in a preshaped assembly.

Hz — Symbol for Hertz, an international unit of

frequency equal to one cycle per second. That is,

20,000 Hz is 20,000 cycles per second.

I/O — Input/Output

IEC — Abbreviation for the International

Electrotechnical Commission. An international

organization that develops standards exclusively

for electrical engineering. CENELEC is the

equivalent organization at the European level.

Impedance Match — When a transmission line is

terminated so that VSWR = 1.00. Another

definition is when a source is terminated in an

impedance that allows optimum energy transfer.

Indentor — The part of a crimping die which

indents the contact barrel to form the actual crimp.

Indentors normally make six or eight multiple

indentions for each crimp.

Initial — A test result taken prior to any other

environmental testing. For example, contact

resistance is frequently specified ‘‘Initial’’, that is,

with ‘‘new’’ contacts. Most specifications also

limit the maximum resistance during or after each

of a series of extreme tests, such as ‘‘Contact

Resistance After Corrosion Test’’. These figures

are typically slightly higher than ‘‘Initial’’.

Insert — See INSULATOR.

Insert Arrangement — See LAYOUT.

Insert Retention Force — The maximum

allowable force which should be applied to the face

of the insulator without dislodging it from the shell

or causing any change in connector performance

specifications. Usually stated in Newtons or

pounds of force.

Insertion Force — The effort, usually stated in

ounces or Newtons, required to engage two

contacts or connector halves.

Insertion Loss — The attenuation that results

when a transducer is inserted in a transmission

line. It is the ratio of the power input to the

transducer to the power out of the transducer

expressed in decibels.

Insertion Tool — A small, hand-held tool used to

insert contacts into a connector.

Insulation — A material that has high electrical

resistance and is suitable for covering or encasing

electrical components to prevent a short circuit.

Insulation Displacement Connector (IDC) — A

connector contact with sharp tines which pierce

and displace the wire insulation and make direct

electrical connection with the conductor. Normally

used with multipin connectors which must be

terminated to flat cable. This is a fast, low cost

method

terminate

many

conductors

simultaneously.

Insulation

Resistance

—

The

minimum

resistance (usually stated in Megohms) between

adjacent contacts and between the contacts and

the shell at a specific voltage. When not stated,

values are typically given for new insulators. Most

specifications also specify minimum resistance

figures during or after each of a series of extreme

tests, such as ‘‘Insulation Resistance During Dry

Heat’’.

Insulation Support — An extended portion at the

rear of a crimp contact that is crimped around the

wire insulation to provide extra strain relief. This

crimp is in addition to the crimp over the conductor

which provides the actual electrical termination.

278

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