D-Sub, D-Shaped Connectors - Backshells, Hoods

Part Number	Description / PDF	Quantity
979-025-020R121 NorComp	CONN BACKSHELL 25POS 180DEG SHLD	272
950-009-020R121 NorComp	CONN BACKSHELL 9P 60DEG SHLD SLV	100
972-037-01SR011 NorComp	CONN BACKSHELL 37POS 180DEG BLK	54
974-015-020R121 NorComp	CONN BACKSHELL 15POS 40DEG SHLD	145
983-015-020R121 NorComp	CONN BACKSHELL 15POS 180DEG SHLD	91
975M015-030R121 NorComp	CONN BACKSHELL 15P 60/180DEG SHD	74
975M025-030R121 NorComp	CONN BACKSHELL 25P 60/180DEG SHD	149
978-050-020R121 NorComp	CONN BACKSHELL 50POS 180DEG SHLD	0
975M037-030R121 NorComp	CONN BACKSHELL 37P 60/180DEG SHD	161
983-009-010R032 NorComp	CONN BACKSHELL 9POS 180DEG GRAY	0
978-037-020R121 NorComp	CONN BACKSHELL 37POS 180DEG SHLD	0
971-050-030R121 NorComp	CONN BACKSHELL 50POS 45DEG SHLD	0
970-050-030R121 NorComp	CONN BACKSHELL 50POS 180DEG SHLD	0
972-025-01SR041 NorComp	CONN BACKSHELL 25P 180DEG GREEN	0
972-037-01SR061 NorComp	CONN BACKSHELL 37POS 180DEG RED	0
974-050-010R011 NorComp	CONN BACKSHELL 50POS 40DEG BLACK	0
976-009-020R121 NorComp	CONN BACKSHELL 9POS 180DEG SHLD	0
983-025-010R012 NorComp	CONN BACKSHELL 25POS 180DEG BLK	0
958-009-010R011 NorComp	CONN BACKSHELL 9POS 180DEG BLACK	0
975M009-030R121 NorComp	CONN BACKSHELL 9P 60/180DEG SHLD	129

D-Sub, D-Shaped Connectors - Backshells, Hoods

1. Overview

D-Subminiature (D-Sub) connectors are electrical connectors with a D-shaped metal shell, providing reliable signal transmission and mechanical protection. Backshells and hoods are critical components that secure cable connections, provide strain relief, and protect against electromagnetic interference (EMI) and environmental factors. These components are essential in industrial, telecommunications, and medical applications where signal integrity and durability are paramount.

2. Main Types and Functional Classification

Type	Functional Features	Application Examples
Standard Backshells	Basic strain relief and EMI shielding	Industrial control systems
Panel-Mount Backshells	Secure connectors to panels or enclosures	Telecom rack equipment
EMI/RFI Shielded Hoods	Enhanced shielding for high-frequency signals	Military communication devices
Cable Clamp Backshells	Integrated cable clamping mechanisms	Factory automation machinery
Weatherproof Hoods	IP67-rated protection against moisture/dust	Outdoor surveillance systems

3. Structure and Components

Typical backshells/hoods consist of: - Metal Shell: Aluminum or steel for EMI shielding and durability - Locking Mechanism: Screws, threaded couplings, or bayonet locks - Cable Entry: Threaded ports or clamping systems - Sealing Glands: Rubber gaskets for environmental protection - Mounting Features: Flanges or panel cutouts for secure installation

4. Key Technical Specifications

Parameter	Importance
Shielding Effectiveness (100kHz-10GHz): 60-100dB	Maintains signal integrity in high-noise environments
IP Rating (IP65-IP68)	Determines protection against dust/water ingress
Operating Temperature: -55 C to +125 C	Ensures reliability in extreme conditions
Vibration Resistance: 10-2000Hz, 10G	Prevents disconnection in dynamic environments
Material Corrosion Resistance	Extends lifespan in industrial/chemical environments

5. Application Fields

Industrial Automation: PLCs, CNC machines, factory sensors
Telecommunications: Routers, base stations, fiber optic equipment
Medical Equipment: Imaging systems, patient monitors
Aerospace: Avionics, flight control systems
Railway: Signaling systems, onboard diagnostics

6. Leading Manufacturers and Products

Manufacturer	Representative Product	Key Features
TE Connectivity	D-Sub Backshell 1-1417087-0	EMI shielding, IP67 rated
Amphenol	97-3107 Series	Panel-mount with threaded coupling
Molex	1055 Series	Integrated cable clamp, RoHS compliant
ITT Cannon	CDM Backshell	Military-grade environmental protection

7. Selection Recommendations

Key considerations include: - Installation Type: Panel-mount vs. inline cable configurations - Environmental Demands: Temperature extremes, chemical exposure - Shielding Requirements: EMI levels in industrial vs. commercial settings - Mechanical Stress: Vibration levels in transportation applications - Compliance Standards: MIL-STD-810, IEC 60529 certifications

8. Industry Trends

Current development directions include: - Miniaturization while maintaining shielding performance - Integrated hybrid connectors for power/data transmission - Advanced materials (e.g., conductive polymers) for weight reduction - Smart backshells with built-in condition monitoring sensors - Increased adoption of IP67+ rated hoods in IoT edge devices