What is a DC plug?

This is a page that explains the types, shapes, selection methods, and sizes of DC plugs used in AC/DC Power Adapters — Desktop & Wall-Mount.

What Types of DC Plugs Are There?

There are various standards for DC plugs, and when using an AC adapter with a device, it is necessary to select the correct plug.

• EIAJ Standard (EIAJ-1,EIAJ-2,EIAJ-3,EIAJ-4,EIAJ-5)
• 3-pin, 4-pin DIN plug
• MINI USB
• MICRO USB
• Type-C, etc.

When selecting a DC plug, it is important to thoroughly check the shape and size.

UNIFIVE compatible plug list to check the sizes

How to Choose the Correct DC Plug

1. Check the Connector Polarity

First, check the polarity of the connector. Generally, devices have connectors where one electrode is connected to the inner hole and the other electrode to the outer hole.

The most common type is called center positive, where the positive electrode is connected to the center pin. When the negative electrode is connected to the center pin, it is called center negative.

If connected incorrectly, it may cause equipment failure, so caution is required.

Check the Shape of the DC Plug

There are two main types of DC plug shapes.

They are called the straight type and the L-shaped type.

Check the Size of the DC Plug

To understand the size of a DC plug, you need to know the outer diameter, inner diameter, and plug length.

• Outer diameter: the outside diameter of the plug's cylindrical barrel
• Inner diameter: the inside diameter of the plug's cylindrical barrel
• Plug length: the length of the metal portion. If it is too short compared to the depth of the insertion port, the metal part will not fully insert and electricity will not be supplied.

When measuring, you need to measure the diameter of the center pin and the inside of the port.

If the inner and outer diameters of both the male and female connectors do not match, they cannot be connected, so it is necessary to select the correct plug size.

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