Welcome: Rucoe Electronics


What size are DC jacks?

DC jacks, also known as barrel connectors, come in various sizes to accommodate different voltage and current requirements, ensuring compatibility with a wide range of devices. These connectors are crucial for supplying power to electronic devices, and their size is defined by two main dimensions: the outer diameter (OD) and the inner diameter (ID). Here’s a breakdown of the common sizes and their applications:


Common Sizes of DC Jacks:

5.5mm x 2.1mm (OD x ID)

Description: The most commonly used size for many consumer electronics, including routers, LED strips, and some small appliances.

Applications: Widely used for devices requiring 12V to 24V DC power.

5.5mm x 2.5mm (OD x ID)

Description: Similar to the 5.5mm x 2.1mm jack but with a slightly larger inner diameter.


Applications: Used in some laptops, monitors, and other higher power devices.

3.5mm x 1.3mm (OD x ID)

Description: Smaller than the 5.5mm jacks, suitable for more compact devices.

Applications: Commonly found in small electronic devices such as handheld gadgets, and older mobile phones.

4.0mm x 1.7mm (OD x ID)

Description: Another popular size for medium-sized devices.

Applications: Used in some laptops, cameras, and other portable electronics.

2.5mm x 0.7mm (OD x ID)

Description: One of the smallest sizes available, used for very low-power applications.


Applications: Common in certain mobile phones and small electronic accessories.

1. Voltage and Current Rating: Ensure the DC jack’s voltage and current rating matches the power requirements of the device.

2. Polarity: DC jacks usually have a positive center pin, but it’s crucial to verify as some devices might have a different configuration.

3. Physical Fit: The jack must fit snugly to prevent power interruptions.

DC jacks come in several standard sizes, with the most common being 5.5mm x 2.1mm. Selecting the right size is essential for ensuring proper electrical connection and power delivery to electronic devices. Always check the device’s specifications to match the correct DC jack size for safe and efficient operation.



Contact: Bella

Phone: 15999819066

E-mail: rucoe@rucoe.com


Add: Taoyuan Street, Nanshan, Shenzhen