
MIL-DTL-38999 series III
Part number
D38999 20 W B 35 P N
Basic series
Type of connector
20 = Square flange receptacle
24 = Jam nut receptacle
26 = Shielding plug
Finish
W = Olive green cadmium plating
F = Electroless nickel plating
K = Stainless steel passivated
Shell size
09 (A), 11 (B), 13 (C), 15 (D), 17 (E), 19 (F), 21 (G), 23 (H), 25 (J)
Contact layout (See below)
Type of contact
P = Crimp pin
S = Crimp socket
PH = Solder pin
SH = Solder socket
PL = Long PCB pin
PC = Short PCB pin
SL = Long PCB socket
SC = Short PCB socket
Orientation
N = Normal
A, B, C, D = Alternative
Electrical
Contact resistance and current rating
| Contact ID | Diameter (mm) | Resistance (mΩ) | Current (A) |
| 22D# | Φ 0.76 | ≤ 12.0 | 5.0 |
| 20# | Φ 1.00 | ≤ 5.0 | 7.5 |
| 16# | Φ 1.60 | ≤ 2.5 | 13.0 |
| 12# | Φ 2.40 | ≤ 1.5 | 23.0 |
| 10# | Φ 3.15 | ≤ 1.0 | 40.0 |
EMI shielding:
At 1GHz: minimum attenuation 85dB (F and W)
At 10GHz: minimum attenuation 65dB (F)
At 10GHz: minimum attenuation 50dB (W)
Withstanding voltage (V):
| Service rating | M | I | II | N |
| Sea level | 1300 | 1800 | 2300 | 1000 |
| 21000m | 800 | 1000 | 1000 | 600 |
Insulation resistance:
Normal ≥ 5000 MΩ, damp heat ≥ 100 MΩ
Electrical continuity between shells:
W class ≤ 2.5 mΩ, F class ≤ 1.0 mΩ, K class ≤ 5.0 mΩ
Mechanical
Shell: Aluminum alloy, stainless steel or copper-alloy
Plating:
Class W: Olive green cadmium plating
Class K: Stainless steel passivated
Class F: Electroless nickel plating
Insulator: Thermo-set plastic
Grommet and seal: Silicon rubber
Contact: Copper alloy with gold plated
Endurance: 500 cycles
Vibration:
Sine: 60g, with temperature cycling and simulated accessory (36 hours)
Random: 44.1 grms in high temperature
49.5 grms in ambient temperature
Shock: At 3 ms half sinusoid, peak value of acceleration: 300g
Contact retention: 22D# , 45N 20# , 67N 16# , 111N 12# , 111N 10# , 111N 8 # , 111N
Environmental
Operating temperature:
W class: -65 oC ~ +175 oC
K, F class: -65 oC ~ +200 oC
Salt spray: according to method from MIL-DTL-38999
F class 48h
W class 500h
K class 1000h













