The comprehensive guide to Molex Connectors
Welcome to DeyTrade, your specialist for electronic components and accessories. We are pleased to present our comprehensive guide to Molex Connectors. As a leader in our field, we understand the importance of reliable and durable connections in all areas of electronics. That’s why we’ve taken the time to put together this resource for you to learn everything you need to know about Molex connectors.
Introduction to Molex connectors
Molex connectors are high quality, versatile interconnects used in a wide range of industries and applications. From simple power supply applications in PCs to highly complex custom connectors in industrial and automotive applications, Molex offers a wide range of solutions. The name “Molex” is often used as a generic name to refer to connectors of this type, regardless of whether they actually come from the manufacturer Molex.
Product diversity of Molex connectors
The product diversity of Molex connectors reflects the breadth and depth of solutions we at DeyTrade offer our customers. Molex, a globally recognised industry leader, produces an impressive range of connectors, ranging from simple to highly complex bespoke designs. This variety ensures that we are able to meet even the most demanding requirements of our customers.
Molex connectors in industrial electronics
Robust, application-specific connectors are used in industrial plants and in the automotive sector. These are often protected against foreign matter and offer features such as a high IP rating, pull-off protection and mechanical insertion/extraction aids such as levers. These connectors are ideal for demanding applications due to their robust design and high quality.
Molex connectors in PCs
PCs generally use simple, standardised connector shapes. Unfortunately, some manufacturers make these connectors with inferior materials and low material thicknesses, which can lead to a reduced service life. An example of such a connector is the 4-pin Molex connector used in the power supply of PCs.
The 4-pin Molex connector and its pinout
The 4-pin Molex connector, also known as the Molex 8981 series, is a standardised connector typically used to power internal PC devices such as hard drives, CD-ROM drives and similar devices with medium to high power consumption. Originally, this connector was used for 5.25″ floppy drives, but it is also used to power fans and other internal components. The assignment and colours of the 4-pin Molex connector are as follows:
Yellow: +12 V
Black: Ground
Black: Ground
Red: +5 V
It is important to note that the colours and the assignment are not chosen arbitrarily. The red wire carries +5V, the yellow wire carries +12V and the two black wires serve as ground.
Applications of the Molex connector
Besides its widespread use in desktop computers and servers, the Molex connector is also used in some automotive applications. For example, it can be used in automotive wiring to connect accessories such as additional fans, lighting or audio systems. It ensures a reliable and robust connection that can withstand the often harsh conditions in the vehicle environment.
Safety instructions when using the 4-pin Molex connector
Observing the correct assignment of the Molex connector is particularly important when it is used in the automotive environment, as incorrect connections can lead to considerable problems. As the electrical systems in vehicles are often complex and interconnected, a fault can not only damage the connected components but also affect other parts of the vehicle electrical system. Furthermore, a faulty connection could even pose a danger to driving safety if it affects the lighting or engine control system, for example.
Differences and alternatives to the Molex connector
The 4-pin Molex connector is a proven and robust solution, but automotive electronics often use more specialised connector types that are better suited to the specific requirements and challenges in vehicles. For example, waterproof connectors are often necessary to withstand the effects of weather and environment. In addition, smaller and more compact connectors, such as the SATA power connector, are often better suited to the tight spaces and special form factors found in modern vehicle designs.
Other Molex connectors and adapters
In addition to the 4-pin Molex connector, other Molex connectors exist for specific applications. 3.5″ floppy drives, for example, use their own power connector, sometimes called a mountain connector. S-ATA drives have their own connector, and the PCIe power connector has been introduced for powering graphics cards. For all these plugs there are adapters that allow a connection with a 4-pin Molex plug. This is of course irrelevant for automotive electronics, but with the rise of smart technologies it is becoming more important.
Frequently asked questions (FAQ) about Molex connectors
Here are answers to some of the most frequently asked questions about Molex connectors:
What is a Molex connector?
Molex connectors are high quality, often customised, interconnect devices used in many different applications and industries. They range from simple connectors used in PC power supply to complex, customised connections for industrial applications.
Why is the name “Molex” often used as a generic name?
Because of its widespread use and familiarity, the name “Molex” is often used as a generic name to refer to connectors of this type, even though they are not necessarily manufactured by the Molex company. This is similar to other brand names that are often used as generic terms, such as “Tempo” for handkerchiefs.
What is the difference between Molex connectors in the automotive industry and PCs?
In the industrial and automotive sector, robust, application-specific Molex connectors are often used. They are characterised by high IP protection classes, pull-off protection and mechanical plugging/unplugging aids. In comparison, the Molex connectors used in PCs are usually standardised and simpler in design.
What are the colour codes for the 4-pin Molex connector?
On a 4-pin Molex connector, the colours and their functions are assigned as follows: Yellow stands for +12V, Red for +5V and the two Black wires stand for Ground.
What other types of Molex connectors are there?
There are several types of Molex connectors in the automotive industry, each designed for specific applications and conditions. Some are designed for high current applications where high current flow is required. Such connectors can be used for components such as starter motors, alternators or power distribution boxes in the engine compartment.
There are also Molex connectors designed specifically for use in harsh conditions. These are usually heat resistant and can withstand vibration and corrosive substances, making them ideal for use in engine compartments or other extreme environments.
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