121073-0151 ITT Cannon, 121073-0151 Datasheet - Page 279

• Manufacturer Part Number: 121073-0151
• Description: DSUB BACKSHELL SIZE 25 STR 5PCS
• Manufacturer: ITT Cannon

Specifications of 121073-0151

• Accessory Type: Two Piece Backshell
• Number Of Positions: 25
• Cable Type: Round
• Cable Exit: 180°
• Shielding: Shielded
• Plating: Nickel over Copper
• Hardware: Cable Clamp
• Color: Silver
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Features: -
• Other names: 1003-1085; DB121073-151

278
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
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.
designed
to
improve
conductivity,
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
simultaneously.
Insulation
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.
to
Glossary of Terms
Resistance
terminate
Dimensions are shown in mm (inch)
Dimensions subject to change
—
many
The
conductors
minimum