How to Use Jst1.25_2pin_male: Examples, Pinouts, and Specs

The Jst1.25_2pin_male connector, manufactured by Tdat, is a compact 2-pin male connector with a 1.25mm pitch. It is widely used in electronic circuits for creating reliable and space-efficient wire-to-board or wire-to-wire connections. Its small size makes it ideal for applications where space is limited, such as in drones, robotics, and compact consumer electronics.

• Connecting sensors, modules, or small devices to a circuit board
• Power delivery in low-current applications
• Signal transmission in compact electronic systems
• Use in battery packs, LED strips, and small motors

Below are the key technical details of the Jst1.25_2pin_male connector:

The Jst1.25_2pin_male connector has two pins, which are typically used for power and ground or signal connections. The pin configuration is as follows:

1. Connector Assembly:
   • Use a compatible JST 1.25mm female connector to mate with the male connector.
   • Ensure the wires are securely crimped into the female connector before insertion.
2. Soldering:
   • If the male connector is through-hole, solder the pins to the PCB pads.
   • Ensure proper alignment and avoid excessive solder that could cause shorts.
3. Wiring:
   • Connect the wires to the female connector, ensuring correct polarity (VCC to Pin 1, GND to Pin 2).
   • Double-check the connections to avoid reverse polarity, which could damage components.
4. Testing:
   • After assembly, test the connection with a multimeter to verify continuity and correct voltage levels.

• Current and Voltage Limits: Do not exceed the rated current (1A) or voltage (50V DC) to avoid overheating or damage.
• Secure Connections: Ensure the female connector is fully inserted into the male connector for a reliable connection.
• Wire Gauge: Use wires with an appropriate gauge (e.g., 28-30 AWG) to fit the crimp terminals of the female connector.
• Environmental Conditions: Avoid exposing the connector to extreme temperatures or moisture, as this may degrade performance.

The Jst1.25_2pin_male connector can be used to connect a sensor or module to an Arduino UNO. Below is an example of connecting a sensor with a JST 1.25mm connector to the Arduino:

• Pin 1 (VCC) of the connector is connected to the Arduino's 5V pin.
• Pin 2 (GND) of the connector is connected to the Arduino's GND pin.

// Example code for reading data from a sensor connected via Jst1.25_2pin_male
// Pin 1 (VCC) is connected to Arduino 5V
// Pin 2 (GND) is connected to Arduino GND
// Signal pin of the sensor is connected to Arduino A0

const int sensorPin = A0; // Analog pin connected to the sensor signal
int sensorValue = 0;      // Variable to store the sensor reading

void setup() {
  Serial.begin(9600); // Initialize serial communication at 9600 baud
  pinMode(sensorPin, INPUT); // Set the sensor pin as input
}

void loop() {
  sensorValue = analogRead(sensorPin); // Read the sensor value
  Serial.print("Sensor Value: ");      // Print the sensor value to the serial monitor
  Serial.println(sensorValue);
  delay(500); // Wait for 500ms before the next reading
}

1. Loose Connection:

   • Issue: The connector is not securely attached, causing intermittent signals.
   • Solution: Ensure the female connector is fully inserted into the male connector. Check for damaged or bent pins.

2. Reverse Polarity:

   • Issue: The VCC and GND pins are swapped, potentially damaging the circuit.
   • Solution: Double-check the wiring and pin configuration before powering the circuit.

3. Overheating:

   • Issue: The connector becomes hot during operation.
   • Solution: Ensure the current does not exceed 1A. Use thicker wires if necessary to reduce resistance.

4. Signal Interference:

   • Issue: Noise or interference in the signal line.
   • Solution: Use shielded cables for signal transmission and keep power and signal wires separate.

Q1: Can I use the Jst1.25_2pin_male 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 DC.

Q2: What is the recommended wire gauge for this connector?
A2: The recommended wire gauge is 28-30 AWG to ensure proper crimping and secure connections.

Q3: Is the connector compatible with other JST series connectors?
A3: No, the Jst1.25_2pin_male connector is specifically designed for the 1.25mm pitch series and is not compatible with other JST series (e.g., 2.54mm pitch).

Q4: Can I use this connector in outdoor applications?
A4: The connector is not weatherproof. For outdoor use, additional protection (e.g., waterproof housing) is required.