DAMMP3C3PJ datasheet(281/301 Pages) ITT

281 / 301 page

Dimensions are shown in mm (inch)

Dimensions subject to change

Performance Class 3 — Performance class per

European specification DIN 41652, specifying

contact performance to 50 mating cycles,

followed by testing per DIN 41640, Part 21. The

contact is subjected to severe environmental

conditions, including industrial gasses, after the

50 mating cycles, and must meet basic contact

resistance, engaging force, and separation force

tests.

Peripheral Seal — A resilient seal used to keep

moisture from entering the connector at the point

where the plug and receptacle shells meet. A

common method is to use flat gaskets on

receptacles and O-rings on plugs.

Phosphor Bronze — An alloy of copper, tin, and

phosphorus used to make spring contacts. It is

typically used in lower cost contacts where

frequent insertions and withdrawals and high

temperatures are not a factor.

Pin — A male contact. See PIN CONTACT.

Pin Contact — The contact which has a long shaft

at the engagement end which enters the socket

contact.

Plating — See FINISH.

Plug — The male portion of a connector pair

usually employing a coupling nut to secure it to the

receptacle half. A plug may have either pin or

socket contacts.

Polarization — A mechanical mechanism that

allows connector halves to intermate in only one

specific orientation. This can be accomplished by

asymmetrical shapes of the two halves as in a D

Subminiature connector, insulator rotation, keys,

keyways, ramps, or other means. Polarization

prevents connectors of the same size and/or same

layout from intermating when this is undesirable,

such as when two otherwise identical connectors

are used on the same panel. Polarization is

typically done by the assembler and can not be

changed by the user, while keying is typically done

by the user with an auxiliary keying device.

Polarizing Pin — A mechanism used to polarize

connectors, manufactured into the connector. See

KEYING.

Potting — The permanent sealing of a cable to a

connector using an insulating material such as

potting compound to exclude moisture or provide

strain relief. See POTTING CUP.

Potting Compound — A sealing material used in

potting to fill a potting cup.

Potting Cup — A bell-shaped (plastic) backshell

with an enlarged opening for the wires. After the

connector is loaded with wired contacts, the

potting cup is attached to the rear of the connector.

The inside of the cup is then filled with a potting

compound. When the compound hardens, it forms

a solid, permanent, watertight mass around the

wires.

Potting Ring — A portion of the POTTING CUP

which secures the bell shaped cup to the rear of the

connector, usually by means of internal threads.

Pre-Tin — To apply tin-lead solder to the contact

solder cup and/or conductor prior to soldering the

two together.

Rear Mounting — A receptacle that mounts

through the panel from the rear, with its mounting

flange inside the equipment. Typically, rear mount

receptacles are slightly longer than front mount

types to allow for the thickness of the panel. Flange

mount receptacles usually come in front and rear

mount versions. All Jam nut receptacles are rear

mount.

Rear Release — For crimp type removable

contacts, rear release means that the appropriate

extraction tool is

inserted from the rear, or wire

side, of the connector. The contact is then pulled

out the rear of the connector.

Receptacle — The connector half that mates with

the plug. The receptacle has threads, pins or

ramps which engage the coupling nut on the plug,

locking the two halves together. A receptacle may

have either pin or socket contacts.

REF — Abbreviation for Reference.

Removable Contact — A contact which can be

inserted and removed from the insulator by the

user. An insertion tool and extraction tool are

normally required to insert and remove the contact.

Removal Tool — See EXTRACTION TOOL

Resistance — That property of a substance which

impedes current and results in the dissipation of

power in the form of heat. The unit of resistance is

the ohm.

Return Loss — The ratio of the power reflected

from a discontinuity in a transmission line to the

power incident.

RFI — See EMI/RFI.

Root Mean Square — The square root, of the

average of the squares, of the values of a periodic

quantity (like alternating current), taken through

one complete period. It is the effective quantity of a

periodic quantity. Abbreviated rms.

Salt Spray Test — A test, or series of tests, in

which mated and/or unmated connectors are

subjected to salt water under specified conditions.

Used to test the connector’s resistance to corrosion

and any associated degradation in electrical

function.

Screw Machine Contact — A contact made from a

solid bar or rod using screw machine operations.

Some screw machine contacts include secondary

elements which are welded, crimped, or formed

around the basic screw machined part to complete

the contact.

Selective Plating — The application of metal

PLATING to selective areas of the contact,

particularly those areas subject to wear. Precious

metal platings may be applied selectively to those

contact surfaces responsible for the electrical

connection, reducing the contact cost without

sacrificing electrical performance.

Shell — The outside case of a connector into which

the insulator and contacts are situated.

Shell Size — A standard system developed for

military circular connectors for indicating the

diameter of the shell. The system is based upon 1⁄16

increments, that is, a size 16 shell is one inch in

diameter.

Shield Effectiveness — The ability of a shield to

screen out undesirable signals.

Shock — An abrupt impact applied to a stationary

object. It is usually expressed in gravities (g).

Socket — A female contact. See SOCKET

CONTACT.

Socket Contact — The contact which has an

opening at the engagement end to accept the pin

contact.

Solder Contact — A contact which is terminated to

the wire with solder. Solder contacts are normally

bonded into the insulator and can not be removed

by the user. The alternative is crimp contacts to

which a wire is attached by crimping. Crimp

contacts can usually be inserted and removed by

the user.

Solder Cup — The end of a SOLDER CONTACT is

designed to accept a wire which will then be

soldered to the contact.

Stamped and Formed Contact — Contacts made

by stamping and forming a sheet of metal rather

than by machining metal stock. Also see SCREW

MACHINE CONTACTS.

D Subminiature

Glossary of Terms

280

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