How to Use jst 1.25_3pin_Female 2 : Examples, Pinouts, and Specs

The JST 1.25_3pin_Female connector is a compact, 3-pin female connector with a 1.25mm pitch. It is widely used in electronic applications where secure and reliable electrical connections are required in a small form factor. This connector is ideal for use in compact devices, such as drones, wearables, and other portable electronics, due to its small size and lightweight design.

• Connecting sensors, modules, or peripherals in compact electronic devices
• Power delivery and signal transmission in drones and robotics
• Wearable technology and IoT devices
• Battery connections in small-scale projects
• Prototyping and development of compact circuits

The following table outlines the key technical details of the JST 1.25_3pin_Female connector:

The JST 1.25_3pin_Female connector has three pins, typically used for power, ground, and signal connections. The pinout is as follows:

Note: The pinout may vary depending on the specific application or device. Always refer to the datasheet or circuit diagram for your project.

1. Prepare the Wires:

   • Use wires with a gauge of 28-32 AWG for compatibility.
   • Strip approximately 2-3mm of insulation from the ends of the wires.

2. Crimp the Contacts:

   • Use a compatible crimping tool to attach the metal contacts to the stripped wire ends.
   • Ensure a secure crimp to avoid loose connections.

3. Insert the Contacts:

   • Insert the crimped contacts into the connector housing until they click into place.
   • Verify that the contacts are fully seated and aligned with the housing.

4. Connect to the Circuit:

   • Plug the JST 1.25_3pin_Female connector into the corresponding male connector on your device or circuit board.
   • Ensure proper alignment to avoid damaging the pins.

5. Secure the Connection:

   • If necessary, use additional securing mechanisms (e.g., adhesive or cable ties) to prevent accidental disconnection.

• Polarity: Double-check the pinout and polarity before connecting the connector to avoid damage to your circuit.
• Current and Voltage Limits: Do not exceed the rated current (1A) or voltage (50V) to ensure safe operation.
• Crimping Tool: Use a high-quality crimping tool designed for JST connectors to achieve reliable connections.
• Environmental Conditions: Avoid exposing the connector to extreme temperatures or moisture, as this may degrade performance.

The JST 1.25_3pin_Female connector can be used to connect a sensor or module to an Arduino UNO. Below is an example of how to connect a sensor with a JST 1.25_3pin_Female connector to the Arduino:

• Pin 1 (VCC) → Arduino 5V
• Pin 2 (GND) → Arduino GND
• Pin 3 (Signal) → Arduino digital pin (e.g., D2)

// Example code for reading a digital signal from a sensor connected via
// a JST 1.25_3pin_Female connector to an Arduino UNO.

const int signalPin = 2; // Pin connected to the Signal pin of the sensor
int sensorValue = 0;     // Variable to store the sensor reading

void setup() {
  pinMode(signalPin, INPUT); // Set the signal pin as an input
  Serial.begin(9600);        // Initialize serial communication
}

void loop() {
  sensorValue = digitalRead(signalPin); // Read the digital signal
  Serial.print("Sensor Value: ");
  Serial.println(sensorValue);         // Print the sensor value to the Serial Monitor
  delay(500);                          // Wait for 500ms before the next reading
}

Note: Ensure the sensor or module connected to the JST 1.25_3pin_Female connector is compatible with the Arduino's voltage levels.

1. Loose Connections:

   • Issue: The connector feels loose or disconnects easily.
   • Solution: Ensure the crimped contacts are fully inserted into the housing. Use a compatible male connector for a secure fit.

2. Incorrect Pinout:

   • Issue: The circuit does not work as expected.
   • Solution: Verify the pinout and ensure the connections match the circuit diagram.

3. Overheating:

   • Issue: The connector becomes hot during operation.
   • Solution: Check that the current and voltage do not exceed the rated limits (1A, 50V).

4. Damaged Contacts:

   • Issue: The metal contacts are bent or broken.
   • Solution: Replace the damaged contacts and ensure proper crimping.

Q1: Can I use the JST 1.25_3pin_Female connector for high-power applications?
A1: No, this connector is designed for low-power applications with a maximum current rating of 1A and voltage rating of 50V.

Q2: What crimping tool should I use for this connector?
A2: Use a crimping tool specifically designed for JST 1.25mm pitch connectors to ensure reliable connections.

Q3: Can I solder wires directly to the connector?
A3: While possible, soldering is not recommended as it may damage the plastic housing. Crimping is the preferred method.

Q4: Is this connector compatible with other JST series connectors?
A4: No, the JST 1.25_3pin_Female connector is only compatible with male connectors of the same series and pitch (1.25mm).