MIL-C-24308 D Subminiature
D H
*
Materials and Finishes
Shell —
In accordance with ASTM 620, 619, 568 —
Low carbon steel, plated with electro-deposited tin
over cadmium over copper flash
Insulator —
Contacts —
Compression glass
In accordance with ASTM A108 —
Steel, plated with gold over nickel
Military vs. ITT Cannon Current Ratings
The ITT Cannon rating for #20 contacts is 5 Explanation
Average Maximum Temperature vs Connector Size
amps, which means 5 amps for all contacts simul- If 15 wires (normally rated at 7.5 amps per wire for various current ratings of mated pairs of D
taneously. MIL-W-5088 rates #20 contacts at 7.5 maximum, or at least a total bundle current of Subminiature connectors
amps maximum. The explanation is as follows:
112.5 amps) are not to carry more than 20% of
the total 112.5 amps, the average current rating
per wire is 20% of 112.5 amps (total bundle ca-
7.5 AMP CONFINED
7.5 AMP FREE AIR
MIL-W-5088B, Paragraph 3.9.2.1.2 specifies:
300
250
“Table 1 current ratings for cables in bundles are pacity) divided by 15 (number of wires).
based upon 15 or more cables carrying no more
than 20% of the total carrying capacity of the Conclusion
5 AMP CONFINED
bundle.”
The Military rating of #20 contacts or wires is 1.5
amps average (based on 15 wires per bundle or
200
150
Table 1 specifies a current rating of 7.5 amps 15 contacts per plug) vs an ITT Cannon rating of
maximum for single wires in bundles of 15 or 5 amps.
more wires. NOTE: Wires and contacts are both
5 AMP FREE AIR
100
150
considered to be in the category of conductors.
E
A
B
C
D
CONNECTOR SIZE
J
Notes:
1. Free air condition. Connectors not shielded from ambient
condition in any manner.
2. Confined condition. Connectors placed in insulated box (1 x 2
x 3.5) during test, with no moving air.
3. Average maximum temperature stabilization: 1 hour or less in
all cases.
4. All contacts in each mated pair tested were wired in series with
specified current flowing.
5. Ambient conditions 77°F, 50% rh.
Test Data
All voltages are measured from contact to shell,
in unmated condition.
Voltage Rating (ac)
Sea Level 20,000
750 625
Altitude (feet)
50,000
225
70,000
175
Test (Max.)
Insulation Resistance.....5,000 megohms min. when tested
per MIL-STD-202A, Method 302
Contact Voltage Drop ....6.67 millivolts per amp max. when
mated with any Original D or
GOLDEN-D connector receptacle
Air Leakage Rate ...........1 micron cubic ft/hour max. (1.04 x
10-5 cc/sec.) at 1 atm pressure
differential
Vibration Resistance......Exceeds test requirements of MIL-
Ref. MIL-C-24308
STD-202, Method 204, Condition B
Corrosion Resistance .....Exceeds requirements of 48 hour
Ref. MIL-C-24308
salt spray exposure, tested in
accordance with MIL-STD-202,
Method 101
Shock ............................Exceeds tests for MIL-STD-202
Ref. MIL-C-24308 Method 213
DWV..............................750 VAC rms
Dimensions shown in inches (mm)
Specifications and dimensions subject to change
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J-46