How to Use DC Barrel Jack 5.5x2.1mm Male: Examples, Pinouts, and Specs

The DC Barrel Jack 5.5x2.1mm Male is a widely used connector designed to supply DC power to electronic devices. It features a cylindrical shape with a 5.5mm outer diameter and a 2.1mm inner diameter, making it compatible with a variety of power adapters and devices. This connector is commonly used in DIY electronics, prototyping, and consumer electronics to provide a reliable and secure power connection.

• Powering Arduino boards, Raspberry Pi, and other microcontrollers
• Supplying power to LED strips, small motors, and sensors
• Used in consumer electronics such as routers, modems, and portable devices
• Ideal for prototyping and custom electronic projects

The following table outlines the key technical details of the DC Barrel Jack 5.5x2.1mm Male:

The DC Barrel Jack 5.5x2.1mm Male has two main connection points:

1. Identify Polarity: Ensure that the power adapter or power source matches the polarity of the device. Most devices use center-positive polarity, where the center pin is positive, and the outer sleeve is negative.
2. Connect to Power Source: Insert the DC Barrel Jack into the corresponding female connector or solder it to the circuit.
3. Soldering: If soldering the jack to a PCB or wires:
   • Solder the center pin to the positive voltage line.
   • Solder the outer sleeve to the ground line.
4. Verify Connections: Double-check the connections with a multimeter to ensure proper polarity and continuity before powering the circuit.

• Polarity Check: Always verify the polarity of the power source and the device to avoid damage.
• Voltage and Current Ratings: Ensure the power source does not exceed the voltage and current ratings of the DC Barrel Jack or the connected device.
• Secure Connection: Use heat shrink tubing or electrical tape to insulate soldered connections and prevent short circuits.
• Avoid Overheating: When soldering, avoid applying excessive heat to the connector to prevent damage to the plastic insulation.

The DC Barrel Jack 5.5x2.1mm Male can be used to power an Arduino UNO. Below is an example of how to connect it:

1. Use a 9V or 12V DC power adapter with a matching 5.5x2.1mm female connector.
2. Plug the male DC Barrel Jack into the Arduino UNO's power input port.
3. Ensure the adapter's polarity is center-positive.

If you are powering sensors or modules through the Arduino UNO, you can use the following code to test the setup:

// Simple LED Blink Test
// Ensure the Arduino is powered via the DC Barrel Jack

int ledPin = 13; // Built-in LED pin on most Arduino boards

void setup() {
  pinMode(ledPin, OUTPUT); // Set the LED pin as an output
}

void loop() {
  digitalWrite(ledPin, HIGH); // Turn the LED on
  delay(1000);                // Wait for 1 second
  digitalWrite(ledPin, LOW);  // Turn the LED off
  delay(1000);                // Wait for 1 second
}

1. No Power to the Device

   • Cause: Incorrect polarity or loose connection.
   • Solution: Verify the polarity of the power source and ensure the jack is securely connected.

2. Overheating of the Connector

   • Cause: Exceeding the current rating of the DC Barrel Jack.
   • Solution: Use a power source within the specified current rating (typically up to 5A).

3. Intermittent Power Supply

   • Cause: Poor soldering or damaged connector.
   • Solution: Inspect the solder joints and re-solder if necessary. Replace the connector if damaged.

4. Short Circuit

   • Cause: Exposed wires or incorrect connections.
   • Solution: Insulate all connections with heat shrink tubing or electrical tape and verify the wiring.

Q: Can I use this connector for AC power?
A: No, the DC Barrel Jack 5.5x2.1mm Male is designed specifically for DC power applications. Using it for AC power may damage the connector or the connected device.

Q: What happens if I reverse the polarity?
A: Reversing the polarity can damage the connected device. Always verify the polarity of the power source and the device before connecting.

Q: Can this connector handle high-power applications?
A: The DC Barrel Jack is typically rated for up to 5A and 24V DC. For higher power applications, consider using connectors with higher current and voltage ratings.

Q: How do I clean the connector?
A: Use a soft, dry cloth to clean the connector. Avoid using water or cleaning agents that may damage the metal or plastic parts.