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CURRENT CARRYING CAPACITY
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SMM/TMM
SAMTEC CORPORATION
67 MECHANIC STREET
AlTlEBORO, MASSACHUSETI’S 02703.
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To perform current carrying capacity testing on Connectors
as manufactured and submitted by the test sponsor, Samtec
Corporation.
TEST SAMPLES AND PREPARATION
1.
The following test samples were submitted by the test
sponsor, Samtec Corporation, for the evaluation to be
performed by Contech Research, Inc.
a)
b)
SMM Receptacle Connectors
TMM Pl-ug Connectors
Unless otherwise indicated, all materials were certified
by the manufacturer to be in accordance with the
applicable product specification.
The test samples as submitted were certified by the
manufacturer as being fabricated and assembled utilizing
normal product techniques common for this type of
product and inspected in accordance with the quality
criteria as established for the product involved.
.
Unless otherwise specified in the test procedures used,
no further preparation was used.
All equipment and measuring instruments used during
testing were calibrated and traceable to NIST according
to IS0 10012-l and ANSI/NCSL 2540-1, as applicable.
3
Contech Research
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EIA 364, TP70
SPECIFICATION:
PROJECT NO.: 96290H
-~~--_----___----_-------~~~~-~~~~-~----~~~~~~~~~~~~~~~~~~~~
PART DESCRIPTION: Socket Contact
PART NO.: SMM/TMM
---_______________-_---------------------------------------TECHNICIAN: SR
SAMPLE SIZE: One
---__________--__---~~---~~~~-~~~~-~~~~-~~~~~~~~~~~~~~~~~~~~
COMPLETE DATE: 9-10-96
START DATE: g-10-96
---_________--------~---------~~~--~~~~~~~~~~~~~~~~~~~~~~~~~
50%
RELATIVE HUMIDITY:
ROOM AMBIENT: 23°C
---______--__-------------A----- ------_----__----_---~-----EQUIPMENT ID#: 25, 250, 410, 440, 536, 580
__-___________--------- ~~~--_----____--____-~~~--~~--- -----CURRENT CARRYING CAPACITY
PURPOSE:
To establish the current carrying capacity of the test
sample under evaluation. This is achieved by determining
the temperature rise resulting at the contact interface at
specified current levels. The temperature rise at a given
current level plus the ambient operating temperature should
not exceed the temperature rating of the test sample. Thus,
the current rating of the system decreases as the operating
ambient increases. This data can also be used to determine
potential local "hot spots" internal to the test sample,
possible degradation factors, thermal effects on adjacent
areas and/or the acceptability for use of pulsing
techniques.
-----________________________ ------__---__---_---------~ ---PROCEDURE:
1.
The test was performed in accordance with EIA 364, TP 70.
2.
Test Conditions:
a)
b)
c)
d)
: 1,3,5 amps
Current Levels
No. of Contacts in Series : Five
: Yes
Derating Curve
: Solder
Termination
3.
The test samples were prepared to accept thermocouples
at the appropriate locations.
4.
The T-Rise was monitored on the middle position of the
five contacts in series.
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Contech Research
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PROCEDURE:
Continued
5.
An additional thermocouple was placed 2" outside of the
test samples adjacent to the locations to be monitored.
This is accomplished to evaluate the impact of ambient
conditions.
6.
The thermocouples were attached to a data acquisition/
scanner system which in turn was interconnected to a
plotter.
7.
The test specimen was placed in a chamber or room which
prevents air currents and the like, influencing the
observations.
8.
The current level indicated was applied until
temperature stabilization was reached.
9.
Temperature stabilization is defined as no change in
T-Rise greater than f 1°C over a 15 minute interval.
___________-___-----____________________-------------------REQUIREMENTS:
The temperature rise shall be measured and recorded and a
current derating curve established.
__-_---__-_----_---_____________________-~~~~--~~--~---~---RESULTS:
1.
Figures #Ol thru 03 indicates the temperature rise
characteristics at 1, 3 and 5 amps. The following is a
sum-u-nary of the data shown on these plots:
CURRENT LEVEL
1.0 amp
3.0 amp
5.0 amp
TEMPERATURE RISE ("C)
29.4
64.1
129.2
2.
The derating curve is evaluated with a maximum connector
operating temperature of 105°C. The base curve is
created by the data from Figures 01 thru 03. The
derated curve is 20% from the base curve.
3.
The current carrying capacity is defined as the
operating ambient (equipment) plus the T-Rise shall not
exceed the maximum connector operating temperature.
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