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 are the types of DC plugs?

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

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

When choosing a DC plug, it is important to carefully check the shape and size.

UNIFIVE in the list of supported plugs from Unifive

How to Select the Right DC Plug

Step 1: Check the Connector Polarity

First, check the polarity of the connector. Typically, devices use connectors where one electrode is located in the inner hole and the other on the outer shell.

The most common type is called "center positive," where the positive electrode connects to the center pin. If the negative electrode connects to the center, it is called "center negative."

Connecting it incorrectly may cause damage to the device, so caution is necessary.

Check the Shape of the DC Plug

DC plugs mainly come in two shapes.

They are called straight type and 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 cylindrical plug
• Inner diameter: the diameter of the inside of the cylindrical plug
• Plug length: refers to the length of the metal part. If it is too short compared to the depth of the socket, 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.

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 size plug.

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