How to Use JST 2 pin: Examples, Pinouts, and Specs

The JST 2 pin connector is a compact and reliable electrical connector designed to join two wires together. It features two pins for connection, ensuring a secure and stable interface for low-voltage applications. These connectors are widely used in electronics due to their ease of use, durability, and compatibility with a variety of devices.

• Battery connections in small electronic devices (e.g., RC cars, drones, and LED strips)
• Power supply connections for low-voltage circuits
• Signal transmission in sensors and modules
• Prototyping and DIY electronics projects

The JST 2 pin connector is available in various series (e.g., JST PH, JST XH), but the general specifications are as follows:

The JST 2 pin connector has two pins, typically used for power or signal connections. Below is the pin configuration:

1. Prepare the Wires: Strip approximately 5-7 mm of insulation from the ends of the wires you want to connect.
2. Crimp the Terminals: Use a crimping tool to attach the metal terminals to the stripped wire ends. Ensure a secure connection by crimping both the conductor and insulation sections.
3. Insert the Terminals: Push the crimped terminals into the plastic housing of the JST connector until they click into place.
4. Connect the Mating Connector: Align the male and female connectors and push them together until they lock securely.

• Wire Gauge: Ensure the wire gauge matches the connector's specifications to avoid loose connections or overheating.
• Polarity: Double-check the polarity of the connections to prevent damage to your circuit.
• Crimping Tool: Use a proper crimping tool designed for JST connectors to achieve a reliable connection.
• Insertion Force: Avoid excessive force when inserting or removing the connector to prevent damage to the pins or housing.

The JST 2 pin connector can be used to power an Arduino UNO or connect peripherals like sensors. Below is an example of connecting an LED strip to an Arduino using a JST 2 pin connector.

• Connect the positive wire of the JST connector to the Arduino's 5V pin.
• Connect the negative wire of the JST connector to the Arduino's GND pin.

// Example code to control an LED strip connected via a JST 2 pin connector
// Ensure the LED strip is compatible with the Arduino's 5V output

int ledPin = 9; // Pin connected to the LED strip

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

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

1. Loose Connections

   • Issue: The connector feels loose or the circuit intermittently disconnects.
   • Solution: Ensure the terminals are properly crimped and fully inserted into the housing.

2. Overheating

   • Issue: The connector becomes warm during operation.
   • Solution: Verify that the current does not exceed the connector's rated capacity (2A). Use thicker wires if necessary.

3. Polarity Reversal

   • Issue: The circuit does not work or components are damaged.
   • Solution: Double-check the polarity of the connections before powering the circuit.

4. Difficulty Inserting Wires

   • Issue: The wires do not fit into the crimp terminals.
   • Solution: Ensure the wire gauge is within the supported range (28 AWG to 22 AWG).

Q: Can I solder wires directly to the JST connector instead of crimping?
A: While it is possible, crimping is recommended for a more secure and reliable connection.

Q: Are JST 2 pin connectors waterproof?
A: Standard JST connectors are not waterproof. For outdoor or moisture-prone applications, consider using waterproof connectors.

Q: Can I use a JST 2 pin connector for high-current applications?
A: No, JST 2 pin connectors are designed for low-current applications (up to 2A). For higher currents, use connectors rated for higher amperage.

Q: How do I remove a terminal from the housing?
A: Use a small flathead screwdriver or a terminal removal tool to gently release the locking tab and pull the terminal out.

By following this documentation, you can effectively use the JST 2 pin connector in your electronic projects with confidence!