on July 22th 5,511

Molex Connectors

In the late 1950s and early 1960s, there was a big change in the way electrical connections were made with the introduction of Molex connectors. At first, these connectors were used for home appliances, but they soon became popular in many other fields because they were reliable and easy to use. The new pin-and-socket design of Molex connectors made electrical connections safer and more stable, setting a new standard in the industry. This article looks at how Molex connectors were developed, how they changed the industry, and their lasting impact on electrical and electronic systems.

Catalog

Figure 1: Molex Connector

What Is a Molex Connector?

A Molex connector is a common type of electrical connector used in many electronic devices. It has a pin-and-socket design that makes sure wires stay connected safely and reliably. The connector has four main parts: the pin, the socket, the nylon connector housing, and special tools for putting it together and taking it apart. Each connector links one wire to another, keeping a strong electrical connection.

The pin is a metal piece that gets attached to a wire using a special tool. This process has two important steps: one step fastens the pin to the wire's metal part, and the other step grips the wire's outer cover. This grip helps relieve strain and keeps the wire securely connected to the pin, even if pulled.

After attaching the pin to the wire, the pin is placed into the socket, which is part of a larger nylon connector housing. This housing organizes multiple pins into a rectangular grid of sockets. The number of sockets can range from one to several hundred, depending on what it's used for.

A metal spring inside the pin locks it into the nylon connector housing, stopping it from falling out and keeping the connection stable over time. During assembly, making sure the pin and socket designs match up well is very important for dependable connections. If needed, a special tool can be used to move the pin and wire to a different socket, allowing for flexible wiring setups.

Molex Connector Configurability

Figure 2: Molex Connector Configurations with Measurements

Molex connectors changed the 20th century with their flexible and dependable design. Their ability to be used in many ways quickly made them popular in different industries, leading to widespread use. The pin-and-socket method provides strong and stable electrical connections.

This design has stayed useful over the years and influenced other makers. For example, TE Connectivity, once known as AMP, created the MATE-N-LOK connector, which works in a similar way to Molex connectors. The MATE-N-LOK also uses a pin-and-socket system, showing how Molex's original design shaped the industry.

Molex connectors and their versions remain popular because they can be adjusted to fit many uses. They can be tailored for different numbers of pins, spacing, and voltage needs. This flexibility makes them suitable for a wide range of electronic and electrical systems, from simple consumer gadgets to complex industrial machines.

The accurate alignment of pins and sockets lowers the chance of connection failures, while strong materials ensure they last a long time and resist wear and tear. These features have led to the continued use and creation of similar connectors by other companies, making Molex connectors a basic part of connector technology.

Four-Pin Molex Connector

Figure 3: Four-Pin Molex Connector

The four-pin Molex connector is a common part used a lot for giving power and handling input/output tasks in electronic devices. One well-known type is the four-pin straight MATE-N-LOK connector from TE Connectivity, which is popular because it works well and is used often.

Another good example is the 5569 series right-angle wire-to-board connector. This connector can handle up to 13 amps of current with 16 AWG wire due to its 4.20mm pin spacing, making it suitable for higher power uses. The 5569 series has a 2x2 receptacle layout, which makes it perfect for being the main power source on small printed circuit boards (PCBs).

The matching piece for the 5569 series is the 5557 series four-pin plug connector. This plug uses crimp pins to hold the wires in place, which makes it easy to test and put together interconnect systems. This design is good for creating reliable and long-lasting power connections in different fields. By using these connectors, engineers can make sure their electronic projects get steady and efficient power.

Molex Two-Pin Connector

Figure 4: Molex Two-Pin Connector

The Molex Micro-Fit 3.0 connector is a popular two-position, 3mm plug-type connector commonly used in many electronic devices. It is designed for small spaces and provides reliable electrical connections.

For the best performance, it is recommended to use Micro-Fit 3.0 female crimp pins with this connector. These pins work well with wire sizes ranging from 20 to 24 AWG. When the crimp pins are properly attached to the wires, they ensure a secure and stable connection, which improves the overall reliability of the system.

The matching receptacle for the Micro-Fit 3.0 plug comes from the Molex 43020 family. These receptacles are designed to be mounted on cables and require crimp pins from the Molex 43031 series. Using this combination ensures a perfect fit with the Micro-Fit 3.0 plug, providing a strong and lasting connection.

To keep the Molex connector system working correctly, it is helpful to carefully pair the part numbers for each component, no matter how many terminals there are. Each part must match correctly to make sure the system functions properly. Checking the datasheets for each part is useful to confirm the right pairing and to maintain the reliability and performance of the entire connector system.

AMP Mate-n-Lok 1-480424-0 Power Connector

Figure 5: AMP Mate-n-Lok 1-480424-0 Power Connector

• Type: Electrical power connector

• Manufacturer: AMP

• Production Started: 1963

• Dimensions: 21 mm (female), 23 mm (male) width; 6 mm (female), 8 mm (male) height

• Pins: 4

• Electrical Specifications: Max. voltage 12V, Max. current 11A/pin (18AWG with 30°C rise)

• Pinout Configuration:

Pin 1: Yellow, +12V

Pin 2: Black, Ground

Pin 3: Black, Ground

Pin 4: Red, +5V

• Wire Size: Typically 18 AWG or 0.823 mm²

Historical Context and Design

Figure 6: Historical Context and Design of Molex Connectors

In the late 1950s and early 1960s, Molex changed the way we connect electrical devices by creating and patenting the first pin-and-socket connectors. These connectors were first made for home appliances, but they quickly became popular in many other fields because they were reliable and worked well. In 1963, another connector called the AMP Mate-n-Lok was introduced. Although it looked similar to Molex connectors, it could not be used with them. Despite this difference, both types of connectors became very common in the growing computer industry. Over time, the name "Molex connector" started being used for all types of nylon plugs and sockets, showing how much Molex's original design influenced the industry overall.

Uses and Adaptations

Figure 7: Molex Connectors Used in Computer Hardware

Molex connectors have played a big role in powering various computer parts like motherboards, fans, floppy disk drives, CD/DVD drives, video cards, and older hard drives. One of the main connectors used in today's computers is the Mini-Fit Jr. connector, which comes in 20 or 24-pin setups and serves as the main power connector for ATX motherboards. In contrast, older AT motherboards used two separate connectors called "P8" and "P9," placed side by side to supply different voltages and signals.

Modern ATX power supplies have changed a lot, adding new features that let the motherboard manage power better. These include wake-on-LAN, which allows a computer to be turned on or awakened from sleep mode remotely via a network connection, and scheduled alarms that can turn the system on at set times. These updates have made computer systems more efficient and easier to control, leading to better power management and overall performance.

Furthermore, the introduction of SATA disk drives marked a move towards more advanced connection systems, initially developed by companies like Molex. SATA connectors have largely replaced the older Molex connectors for disk drives, offering faster data transfer rates and better reliability. To keep up with modern hardware setups, adaptors are available that convert Molex connectors to newer standards, such as PCIe power connectors. This ensures that older power supplies can still be used with today's components, making sure that older and newer technologies can work together smoothly.

Conclusion

Molex connectors have had a lasting impact on the world of electrical connections. Their reliable pin-and-socket design became a model for many other connector systems, including the well-known AMP Mate-n-Lok. Over the years, Molex connectors have been used to power a wide range of devices, from early home appliances to modern computer systems. Their ability to adapt, their durability, and their ease of use have kept them relevant in a constantly changing technological world. As a basic part of many electronic and electrical systems, Molex connectors show how a well-designed solution can support technological progress for many years.

Frequently Asked Questions [FAQ]

1. What is the most common Molex connector?

The most common Molex connector is the four-pin power connector found in computer power supplies. It connects older hard drives, CD/DVD drives, and other internal computer parts. This connector has two black ground wires, one yellow wire for +12V, and one red wire for +5V, making it versatile for various devices within a computer. Despite the move to SATA and other connectors in modern systems, the four-pin Molex remains common in older systems because of its reliability.

2. Is a Molex connector safe?

A Molex connector is safe when used properly. Its design ensures securely crimped pins and a durable nylon housing, which provides good insulation and reduces the risk of accidental contact with live wires. The pin-and-socket design ensures a firm connection that resists vibration and movement, which is important in environments with physical stress. Proper use includes not overloading the connectors beyond their rated capacity to maintain safety.

3. Is Molex a good connector?

Molex connectors are good connectors because they are tough, easy to use, and work reliably. The pin-and-socket mechanism ensures strong and stable electrical connections, which is needed for consistent power and signal transmission. Made from high-quality materials, they resist wear and tear, ensuring they last a long time. The design allows for easy assembly and disassembly, making them great for connecting and disconnecting parts as needed. This versatility has made Molex connectors a popular choice in many uses, including cars, factories, and household electronics.

4. Do people still use Molex?

People still use Molex connectors, particularly in older computer systems and various industrial applications. Although modern computers have mostly switched to SATA and other more efficient connectors, many older systems and older hardware still rely on the traditional four-pin Molex connectors. They are also commonly used in custom-built PCs and some power supply setups where multiple power sources are needed. In industrial settings, Molex connectors are valued for their reliability and ease of maintenance.

5. How much power can Molex deliver?

Molex connectors can deliver up to 11 amps per pin using 18 AWG wire, which provides good power for many electronic devices. The standard four-pin Molex connector, with its +12V and +5V power lines, can supply enough power for various internal computer parts like hard drives and CD/DVD drives. The strong construction and secure connections ensure stable and reliable power delivery, minimizing the risk of power problems that could damage sensitive electronic parts. This power capacity makes Molex connectors suitable for a wide range of uses.