The D-sub connector is a classic interface invented by ITC in 1952. It remains the cornerstone of reliable interconnection in the industrial and military sectors. Its name comes from the D-shaped anti-misinsertion structure of the metal shell. It can carry 9~108pin signal transmission and has a protection level of up to IP68.
Product Description
The D-sub connector is a classic interface invented by ITC in 1952. It remains the cornerstone of reliable interconnection in the industrial and military sectors. Its name comes from the D-shaped anti-misinsertion structure of the metal shell. It can carry 9~108pin signal transmission and has a protection level of up to IP68.
- D-sub connector pin layout: signal pins and power pins are staggered and isolated, and 1 ground pin is matched for every 2 power pins (anti-crosstalk)
Product Features
1. Electrical performance
- Current: signal pin ≤3A, power pin ≤30A (DD78 mixed type)
- Withstand voltage: AC 1500V (medical grade)/AC 3000V (military)
2. Mechanical strength
- Plug life: consumer grade 500 times → industrial grade 5000 times
- Vibration resistance: screw locking type passes 10G acceleration test (ISO16750)
3. Environmental protection
| Scenario |
Solution |
Test standard |
| Salt spray corrosion |
316L stainless steel shell + anti-sulfur silver plating |
96 hours salt spray test |
| High and low temperature cycle |
LCP base (-65°C~200°C) |
MIL-STD-810H |
| Chemical corrosion |
PPS shell + fluororubber seal |
IEC 60068-2-42 |
Core Functions
| Function |
Technical implementation |
Industry standard |
| Electrical connection |
Copper alloy pins (gold-plated/tin-nickel-plated) |
Contact resistance <10mΩ |
| Mechanical locking |
Screw/push-pull lock (vibration-resistant 10G) |
IEC 60512-9 |
| Environmental protection |
Metal shell + silicone seal (IP68) |
MIL-STD-1344 |
How to select a D-sub connector
1. Pin requirements
- ≤15 pins signal: DB/DE (low cost)
- ≥37 pins mixed: DC/DD (power + signal isolation)
2. Application scenarios
- Vibration scenario: metal shell + screw locking (suffix S/W4)
- Corrosion scenario: PPS/stainless steel + tin-nickel plating (salt spray > 96h)
3. Electrical strengthening
- High frequency signal: gold-plated pin + shielding shell (crosstalk: -60dB)
- High current: independent power pin (current carrying ≥ 30%)
4. Installation method
- Frequent plugging and unplugging: push-pull lock (operating force ≤ 15N)
- Permanent fixation: potting glue filling (thermal conductivity > 1.5W/mK)
Application Scenarios
| Scenarios |
Pain points |
Recommended models |
Key technologies |
| Industrial robots |
Contact failure caused by joint vibration |
DC37F (floating type） |
±0.5mm tolerance compensation |
| Railway contact network |
Salt spray corrosion of contacts |
DB25S-316L |
Sulfur-proof silver plating + IP68 |
| Medical CT machine |
High-frequency signal crosstalk |
DC37HD |
1 GND shielding pin for every 3 signal pins |
| Military aircraft avionics |
Electromagnetic pulse) medium interference |
M24308/2-04G |
Full metal shell + ferrite magnetic ring (EMI>80dB) |
| Energy storage power station |
High current temperature rise |
DD78HP |
Independent partition of power pins (copper thickness 1.5mm) |
