TST24AS01T datasheet(87/96 Pages) ITT

87 / 96 page

www.ittcannon.com

Dimensions shown in mm (inch)

Specifications and dimensions subject to change

Cannon Trident Connectors

Glossary of Terms

GLOSSARY OF TERMS

In every job speciality there are certain

words and phrases used by “insiders”

which after a time become almost a

language unique to that speciality. Trident

technology is a typical example of that

condition.

This page provides some explanations, in

an attempt to clarify some of the terms

that are commonly used by engineers and

sales staff at Cannon.

The list is not comprehensive, but high-

lights many of the expressions commonly

used. Should you have any comments or

additions please contact us. Feedback will

be appreciated.

ADAPTER – A device used to modify the

accessory threading on the rear of the

connector. Typical adapters are used to

attach conduit, heat shrink, overmolds,

or tubing to the connectors. They are

generally used in place of a cable clamp.

AWG – American Wire Gauge. A method

of specifying wire diameter. The higher

the number, the smaller the diameter (a

size 16 AWG wire has a larger diameter

than a size 22 AWG).

BAYONET COUPLING – A quick coupling

mechanism for mechanically mating and

unmating connector halves. The plug

half has a coupling nut with internal

ramps and the receptacle has three

“bayonet” pins. The two halves are

mated and unmated by rotating the

coupling nut. The two haves are mated

and unmated by rotating the coupling nut.

BACKSHELL – See ENDBELL.

BODY - The main portion of the connec-

tor made of the shell, insulator, and con-

tacts.

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, others provide only strain

relief.

CABLE SEAL – An endbell or cable

clamp that is used to seal a round

jacketed cable as it enters the rear of

the connector.

CONTACT – The conductive element in

a connector which makes the actual con-

nection 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. Contacts come

in many styles such as solder, crimp,

printed circuit (PC), to name just those

found in this catalog. Also see SOLDER

CONTACT, CRIMP CONTACT, STAMPED

AND FORMED CONTACT, PIN CONTACT,

and SOCKET CONTACT.

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 (4.45 = 1 lbf).

CONTACT SEPARATION FORCE – The

force required to separate a pair of mated

contacts. Usually stated in grams or

ounces.

CONTACT SIZE – The size of the

engaging pin and socket contacts in

AWG size or metric diameter of the pin.

CONTACT SPACING – The distance

between two centers of adjacent

contacts.

COUPLING NUT (Also known as LOCK-

ING RING) - The rotating ring on plug

style connectors which mechanically locks

the two connector halves together.

CRIMP CONTACT – A contact which is

terminated to a wire by means of

mechanical deformation of the receiving

area by means of an appropriate tool.

CSA – Abbreviation for Canadian

Standards Association.

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.

DERATING CURVE – A graph of the

change in power handling capability of a

connector as a function of ambient tem-

perature or altitude. Typically the graphed

function is curved, hence the name.

DISCRIMINATION – A method of

ensuring that two similar size connectors

cannot be mated. This may be achieved

by inclusion of discriminating pins, which

enter an empty contact cavity, or by other

mechanical means.

DISCRIMINATING PINS – See KEYING.

ENDBELL (also know as BACKSHELL) –

The outer rear end of the connector,

which is attached by means of internal

threads or screws. It adapts the connec-

tor to its wire connections in a variety of

ways. Typical endbells might have cable

clamps to secure a wire bundle, ridges for

heat shrink tubing, pipe threads, or shield

termination mechanisms.

EXTRACTION TOOL – A device used to

remove a contact from a connector

insulator. The extraction tool is inserted

into the mating face of the insulator and

the contact comes out the rear, or wire

side, of the connector.

FIRST-MAKE LAST-BREAK CONTACT –

A contact which is longer than a standard

contact or which sits in the insulator in

such a way that it mates with the

opposing connector half before any of

the other contacts. Used to ensure that

a ground connection between the

connector halves mates before any of the

other contacts.

FLANGED RECEPTACLE – The shell of

this connector has a square flange with

mounting holes at each corner.

Mounting holes are usually clearance

holes, but may be threaded. Receptacle

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