What is a DC plug?

AC/DC Power Adapter is a page explaining the types, shapes, selection methods, and sizes of DC plugs.

What Are the Types of DC Plugs?

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 plugs
• 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 is connected to the outer surface.

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 device failure, so caution is required.

Check the Shape of the DC Plug

DC plug shapes are broadly divided into two types.

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 the length of the plug.

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

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

The inner and outer diameters of both the male and female connectors must match in order to connect, so it is necessary to select the correct plug size.

Related content