D-sub Connectors

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Sub-D Connectors: Versatile solutions for signal transmission in your electronic devices

Standard Specifications of SUB-D Connectors and Types of Housings

SUB-D connectors, also known as D-subminiature connectors, are essential for connecting electronic devices and transmitting data signals efficiently. In this article, we explore the specifications, types of housings, and common applications of SUB-D connectors.

What Are SUB-D Connectors?

SUB-D connectors are standard electrical connectors used in a variety of industrial, computing, and telecommunications applications. They are characterised by their "D" shape and ability to handle multiple pins, making them ideal for transmitting signals and data in diverse environments.

Standard Specifications of SUB-D Connectors

SUB-D connectors come in different configurations, with the most common being the following:

DE-9: A 9-pin connector, commonly used for RS-232 serial ports.
DB-25: A 25-pin connector, used for parallel communications and extended RS-232 ports.
DA-15: A 15-pin connector, used for joystick interfaces or older VGA connections.
DC-37: A 37-pin connector, used for high-speed data applications.

Types of Housings for SUB-D Connectors

The housings for SUB-D connectors are essential components that provide protection and organisation for the connectors. These housings can be found in different materials, shapes, and mounting types. Below, we detail the most common types:

By Material

Plastic: Lightweight and cost-effective but with lower EMI (electromagnetic interference) protection.
Metallic: Provides effective EMI shielding and is resistant to harsh industrial conditions.
Metallic-plated plastic: Offers a compromise between lightness and EMI protection.

By Mounting

With lateral screw mounting: Used in applications where the connection must be securely fastened.
Snap-fit: A quick and cost-effective connection, ideal for less demanding projects.
With latch locking: A more secure closure system for industrial or sensitive applications.

By Cable Entry Shape

Straight: The cable enters directly from the rear of the connector.
90° angled: Ideal for tight spaces and when the cabling needs to be diverted laterally.

With EMI/RFI Shielding

Some housings include shielding to protect against electromagnetic interference (EMI) and radio-frequency interference (RFI), which is essential for industrial or high-speed applications.

Common Applications of SUB-D Connectors

SUB-D connectors are widely used in various fields due to their versatility. Some of their most common applications include:

Data Communications: DB-25 and DE-9 connectors were widely used for printer ports and serial communication devices such as RS-232.
Industrial Applications: Shielded connectors, such as DB-25 or DC-37, are used for high-speed connections in machinery or industrial networks.
Video Connections: DA-15 was used in older graphics cards and monitors, especially in the VGA system.

How to Choose the Right SUB-D Connector

When choosing a SUB-D connector, it is important to consider factors such as the number of pins, the type of shielding required, and the environment in which the connector will be used. For industrial applications or where high electromagnetic interference is present, connectors with EMI shielding are an ideal choice.

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