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Modular Connectors - Jacks

Modular connectors, also known as jacks, commonly referred to as phone jacks in telecommunication, are an essential component to many devices, from cell phones, computers to telecommunication systems. An important type of modular connector is the 44661–0021. So what are its application field and working principle? In this article, these two aspects will be addressed.

Application Field

The 44661–0021 is a type of 2.5mm two pole mono audio jack, widely used for various audio devices—especially headphones. This type of audio jack is popularly standardized in Europe and Asia, which is why it’s often seen on devices purchased from these regions. As one of the most commonly used audio connectors, the 44661–0021 is also typically used to connect various audio appliances such as walkie-talkie, two-way radios, Push-to-Talk radios, cordless phones, cellphones, and even for intercom paging systems.

Working Principle

The 44661–0021 consists of a mono plug and a receptacle with a 2.5mm diameter center pin, which is usually made of a copper alloy. This receptacle is sealed with a rubber sleeve and provides the necessary insulation. According to the design specifications, the 44661–0021 is a 2-pole mono audio plug, which means it only transmits audio in one channel and can carry up to 50 volts of DC power. However, the current capability is limited and this connector generally has a maximum current of 400mA.

When connecting, the 2.5mm plug slides into the 44661–0021 receptacle and the tiny pin presses against the receptacle’s terminal. This results in the electrical conductivity providing a low-resistance connection between the two. Often times, an additional locking mechanism is used to relieve any strain on the contacts, as well as providing a secure fit. This is a highly effective fail-safe, making sure the connection is not easily disconnected.

Conclusion

The 44661–0021 modular connector is an essential component in many audio devices, such as headphones, walkie-talkies, two-way radios, cordless phones, cellphones, and more. This 2.5mm two pole mono audio jack consists of a mono plug and a receptacle, and has a common current capacity of 400mA. The 44661–0021 is able to provide a low-resistance connection between two components by inserting the 2.5mm plug into the receptacle and pressing it against the receptacle’s terminal while the additional locking mechanism provides a secure fit and keeps the connection from easily being disconnected.

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