DAMMP3C3PJ datasheet(278/301 Pages) ITT

278 / 301 page

D Subminiature

Glossary of Terms

Closed Socket Contact — A socket contact in

which the mating cavity limits the entry of a contact

or probe having a diameter larger than the mating

pin.

Coax — Abbreviation for coaxial.

Coaxial Cable — A cable that comprises a single

copper wire surrounded by insulating material,

wire shielding or mesh, and a plastic protective

sheath.

Component — An essential functional part of the

connector.

Contact — The conductive element in a connector

which makes the actual connection between the

wire and the mating connector for the purpose of

transferring electrical energy. Ideally the contact

should add nothing to the circuit. In the real world,

however, contacts typically have a small

CONTACT RESISTANCE and associated potential

drop.

Contact Alignment — The overall play that a

contact has in the insulator cavity to allow the

mating contacts to self align. Also called contact

float.

Contact Arrangement — See LAYOUT.

Contact Cavity — A defined hole in the connector

insulator into which the contacts fit. The cavities

are generally marked with a unique designation or

number for ease of identification.

Contact Resistance — The maximum amount of

resistance which a contact introduces into the

connection when carrying a specified current

(usually stated in milliohms). When not stated,

values are typically given for ‘‘Initial’’ or ‘‘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’’.

Contact Retention — The maximum allowable

axial load which can be applied to a contact from

either direction without it being dislodged from the

insulator. Usually stated in Newtons or pounds of

force.

Contact Separation Force — The force required

to separate a pair of mated contacts. Usually

stated in Newtons or pounds of force.

Contact Size — This usually relates to the

maximum size wire this contact can nominally

accommodate. It is based on that AWG size most

closely corresponds to the circular mil area of the

engaging end of a pin contact for that size. For

example, a size 16 contact can accomodate a size

16 AWG wire maximum and the pin corresponds to

the CMA of a size 16 AWG. Note, however, that

oversized crimp pots are available for some crimp

contacts which will allow, for example, a size 16

contact to accommodate a size 14 AWG wire.

Contact Spacing — The distance between the

centers of adjacent contacts.

Creepage — The conduction of electricity across

the surface of an insulator.

Creepage Distance — The shortest distance

between contacts of opposite polarities, or

between a live contact and ground, measured over

the surface of the insulator.

Creepage Path — A path across the surface of the

insulator between two conductors. Lengthening

the path reduces the possibility of arc damage.

Crimp — A method of attaching a contact to a wire

through the application of pressure.

Crimp Contact — A contact which is terminated to

a wire by means of crimping with an appropriate

die and tool. After termination, an insertion tool is

normally used to insert the crimped contact into

the connector. Removable crimp contacts can be

FRONT RELEASE or REAR RELEASE. An

extraction tool is usually required to remove the

contact.

Crosstalk — Undesired electrical currents in

conductors

caused

electromagnetic

electrostatic coupling from other conductors or

from external sources. Also, leakage of optical

power from one optical conductor to another.

CSA — Abbreviation for Canadian Standards

Association.

Current — The movement of electrons through a

conductor. Current is measured in amperes. Its

symbol is L.

Current Rating — The maximum current that a

particular wire, contact, or connector can

accommodate. NOTE: When several wires are

used in a single connector or elevated temperature

or altitude is involved, derating curves must be

applied to these ratings. A typical derating system

is MIL-W-5088 which allows the user to calculate

the

derating

effects

current,

ambient

temperature, number of wires in the bundle, and

altitude.

Decibel — A standard unit of measure for

transmission gain or loss. It expresses the ratio of

power input to power output. Abbreviated dB. The

term dBm is used when 1 milliwatt is the reference

level.

Derating — To reduce the voltage, current, or

power rating of a connector to improve its

reliability or to permit operation at high ambient

temperatures or altitudes.

Derating Curve — A graph of the change in power

handling capability of a connector as a function of

ambient temperature or altitude. Typically the

graphed function is curved, hence the name.

Diallyl Phthalate — A thermosetting plastic used

for insulators and some types of connector

housings. It has outstanding resistance to

chemicals, excellent dimensional stability, and

superior electrical insulating properties.

Dielectric — An insulator used to isolate two

conductors having a low loss factor (RF cables).

The perfect insulator is a vacuum.

Dielectric Constant — That property (K) of an

insulating material which is the ratio of the parallel

capacitance (C) of a given configuration of

electrodes with the material as the dielectric, to the

capacitance of the same electrode configuration

with a vacuum as the dielectric.

Digital — A signal comprising discrete elements.

DIN — Abbreviation for Deutsche Industrie Norm,

a German standards organization.

Direct Current — An essentially constant value of

current that flows in only one direction.

Abbreviated dc.

Dust Cap — A cover used in place of a mating

connector to seal it against dirt and moisture.

Usually secured to the connector by a captive

chain, wire, or rope.

Electroplating — To deposit a metal on the

surface of a conductor using electrolysis.

EMI/RFI — Electro-Magnetic Interference and

Radio Frequency Interference. This is unwanted

stray electronic radiation which may enter, and/or

be emitted by an electronic system. The most

common method of shielding interconnections

against this radiation is to use wires with a metallic

braided shield and a connector system which will

extend the shield through the interconnection. This

type of design will keep radiation from entering, or

being emitted by the system. Backshells for

shielded cable and connectors with threads or

grounding fingers are typically used for this

purpose.

Call

for

the

specific

EMI/RFI

accommodations of the connectors in this catalog.

Dimensions are shown in mm (inch)

Dimensions subject to change

277

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