1-207303-3 Datasheet, PDF (9/51 Pages) Tyco Electronics – AMP Circular Connectors for Commercial Signal & Power Applications

AMP Circular Connectors for
Note: All part numbers
Commercial Signal and Power Applications ^{are RoHS Compliant.}
Current Rating
The presentation of current-
carrying capacity in AMP
product specifications includes
two parts:
I First, a base curve showing
current levels versus T-rise for
a single circuit and the largest
wire size (See figure 1). This
represents the maximum
current capacity of the
contact. The curve is usually
flat up to 75°C ambient and
then drops off. Up to 75°C, the
30°C T-rise limits the amount
of current, and above 75°C
the current must be reduced
to keep the combination of
ambient temperature and
T-rise from exceeding the
maximum operating tempera-
ture of 105°C.
I Next are rating factors, a
table of multipliers to account
for connector loading and for
smaller wire sizes (See figure 2).
The designer first determines
the base current for the
ambient conditions of the
application; then multiplies
this base current by the rating
factors to find the current
level for the application’s
loading factor and wire size.
Practical Values
The current-rating method
gives designers practical
values applicable to their appli-
cations. While the specified
current levels for a contact may
be lower than for other testing
methods, they are more practi-
cal and simplify the system
design process.
“Spec-manship” is replaced
by a realistic assessment of the
current-carrying capacity of a
contact under varying condi-
tions of temperature, connector
loading, and wire size.
Specific current-carrying data
based on EOL and % loading is
available from Tyco Electronics.
Please contact your local
Tyco Electronics Sales Engineer
or call Tyco Electronics.
Connector/Contact Acceptability
As previously stated, choosing
the correct connector/contact
combination is fundamental
to the successful function of
all connectors. The Selector
Chart shown at right, is
designed to simplify your choice
Presentation — An Example*
of connectors and their accept-
able contacts. Once you have
selected the wire size, current-
carrying capacity need,
number of positions required,
and the type of contacts
needed in your choice of
connector, refer to this matrix
for a quick look at exactly what
is acceptable in a given
connector type.
Figure 1
15
Single Contact
18 AWG
10
5
*Note: Data is not typical of a
specific CPC connector configu-
ration. For specific current
rating information based on %
connector loading, contact
Tyco Electronics.
To demonstrate the method of
specifying current, consider the
following application conditions;
an ambient temperature of 65°C,
a 50% loading of contacts in
the housing, and 20 AWG
[0.6mm²] wire.
I From Figure 1, the base
current rating is 14 ampere
with 18 AWG [0.8mm²] wire.
I Figure 2, the rating factor for
50% loading and 20 AWG
[0.6mm²] wire is 0.68.
I The specific rating for this
application is the product of
the base rating and the rating
factor:
14 x 0.68 = 9.5 ampere
I Each of the contacts can
carry 9.5 ampere.
I However, if the ambient temper-
ature is 80°C the allowable
T-rise becomes 25°C. The base
current must be lowered to
12.8 ampere so that the 105°C
maximum operating tempera-
ture is not exceeded. The
current rating then becomes:
12.8 x 0.68 = 8.7 ampere.
0
0 10 20 30 40 50 60 70 80 90 100
Ambient Temperature (°C)
Graph shows the relationship between base current, ambient
temperature, and contact T-rise.
AWG
18
20
22
24
26
Single
1
.83
.69
.59
.50
30%
.97
.80
.66
.57
.49
50%
.83
.68
.57
.48
.42
70%
.65
.53
.45
.38
.33
100%
.55
.45
.38
.32
.28
Figure 2
Rating factors allow the base current to be adjusted for various
connector loading and wire sizes.
Contact Selector Chart
Connector
Type
CPC Series 1
CPC Series 2
CPC Series 3
CPC Series 4
CPC Series 5
CPC Series 6
CPC 5015
CMC Series 1
CMC Series 2
CMC Series 3
CMC Series 4
20 DF


Type I

Type II





Type III+






Posted
Type III+

Type XII





Sub-Mini POWERBAND
Coax
Contacts






Catalog 82021
Revised 7-07
www.tycoelectronics.com
Dimensions are in inches and
millimeters unless otherwise
specified. Values in brackets
are metric equivalents.
Dimensions are shown for
reference purposes only.
Specifications subject
to change.
USA: 1-800-522-6752
Canada: 1-905-470-4425
Mexico: 52-55-1106-0800
C. America: 57-1-254-4444
9
South America: 55-11-2103-6000
Hong Kong: 852-2735-1628
Japan: 81-44-844-8013
UK: 44-208-420-8341