Description
A Female DC Power Socket (commonly referred to as a DC Barrel Jack) is a connector used to safely and easily connect a DC power source—typically from a wall adapter—to an electronic device.
These connectors come in several sizes and mounting styles. The most common “standard” size for hobby electronics (like Arduino projects, LED strips, and CCTV cameras) is the 5.5mm x 2.1mm barrel jack.
Typical Product Specifications
| Feature | Common Specification |
| Common Sizes (OD x ID) | 5.5mm x 2.1mm (Industry Standard), 5.5mm x 2.5mm, 3.5mm x 1.35mm |
| Contact Material | Brass or Copper, often nickel or silver-plated |
| Voltage Rating | Typically rated for 12V to 24V DC (varies by model) |
| Current Rating | Typically 1A to 5A (depends on pin/contact quality) |
| Mounting Types | PCB Mount (Through-hole or SMD), Panel Mount, or In-line Cable Mount |
| Polarity | Almost universally Center Positive (Inner pin is +, outer sleeve is -) |
Key Features
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Center Pin: The inner pin carries the positive (+) voltage, while the outer metal barrel sleeve carries the ground (-) connection.
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Switching Function: Many panel-mount versions include a third terminal (a built-in switch). This allows the device to automatically disconnect an internal battery when an external power plug is inserted.
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Compatibility: Always ensure the Outer Diameter (OD) and Inner Diameter (ID) of the female socket match the male plug on your power adapter exactly. A 2.1mm plug may not make a reliable connection in a 2.5mm socket.
Usage Tips
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Polarity: Always verify your power supply polarity. While most devices are “Center Positive,” reversed polarity can cause permanent damage to sensitive electronics.
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Current Capacity: Ensure the socket’s current rating meets or exceeds the maximum current your project will draw. Using a low-current-rated socket for a high-current load can lead to overheating, melting, or intermittent power failures.
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Mounting: If you are mounting this to a case or enclosure, check if you need a panel-mount version (which has a threaded metal or plastic nut) or a PCB-mount version (which has legs that solder directly onto a circuit board).
Are you looking for a specific size for a project, or do you need help determining how to wire one into your circuit?
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