How to Use JST PH 2.54 connector: Examples, Pinouts, and Specs

The JST PH 2.54 Connector (Manufacturer Part ID: JST 2.54 2P) is a compact, reliable connector designed for connecting wires in electronic circuits. With a 2.54mm pitch, it is widely used in low-power applications where space-saving and secure connections are essential. This connector is part of the JST PH series, known for its durability and ease of use.

• Consumer Electronics: Used in devices like remote controls, toys, and small appliances.
• Prototyping and Development: Ideal for connecting sensors, modules, and other components to microcontrollers.
• Battery Connections: Commonly used for connecting rechargeable batteries in small devices.
• LED Strips and Lighting: Provides a secure connection for low-power LED strips.

The following table outlines the key technical details of the JST PH 2.54 Connector:

The JST PH 2.54 Connector typically has two pins (for the 2P variant). The pin configuration is as follows:

1. Wire Preparation:

   • Strip the insulation from the wire ends (approximately 2-3mm).
   • Ensure the wire gauge is within the supported range (28-22 AWG).

2. Crimping:

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

3. Connector Assembly:

   • Insert the crimped terminals into the connector housing until they click into place.
   • Verify that the terminals are securely locked in the housing.

4. Mating:

   • Align the connector with its counterpart (e.g., a PCB header or another JST connector).
   • Push the connector gently until it clicks into place.

• Polarity: Always ensure correct polarity when connecting the wires to avoid damage to the circuit.
• Current and Voltage Limits: Do not exceed the specified current (2A) and voltage (100V) ratings.
• Secure Connections: Double-check that the terminals are fully inserted and locked into the housing.
• Crimping Tool: Use a high-quality crimping tool designed for JST PH connectors to ensure reliable connections.
• Avoid Overheating: If soldering is required, avoid overheating the connector to prevent damage to the insulation material.

The JST PH 2.54 Connector can be used to connect a sensor or module to an Arduino UNO. Below is an example of connecting a temperature sensor with a JST PH connector:

• Pin 1 (Positive) → Arduino 5V
• Pin 2 (Negative) → Arduino GND

// Example code for reading a temperature sensor connected via JST PH 2.54 connector
// Ensure the sensor's output is connected to Arduino analog pin A0

const int sensorPin = A0; // Analog pin connected to the sensor
float voltage, temperature;

void setup() {
  Serial.begin(9600); // Initialize serial communication
}

void loop() {
  int sensorValue = analogRead(sensorPin); // Read the sensor value
  voltage = sensorValue * (5.0 / 1023.0); // Convert to voltage
  temperature = (voltage - 0.5) * 100.0; // Convert voltage to temperature (Celsius)

  // Print the temperature to the Serial Monitor
  Serial.print("Temperature: ");
  Serial.print(temperature);
  Serial.println(" °C");

  delay(1000); // Wait 1 second before the next reading
}

1. Loose Connections:

   • Cause: Terminals not fully inserted into the housing.
   • Solution: Reinsert the terminals until they click into place.

2. Incorrect Polarity:

   • Cause: Wires connected to the wrong pins.
   • Solution: Verify the pin configuration and ensure correct polarity.

3. Overheating or Melting:

   • Cause: Exceeding current or voltage ratings, or improper soldering.
   • Solution: Stay within the specified ratings and use proper soldering techniques.

4. Crimping Issues:

   • Cause: Poor-quality crimping tool or incorrect wire gauge.
   • Solution: Use a compatible crimping tool and ensure the wire gauge matches the specifications.

• Check Continuity: Use a multimeter to check for continuity between the connector pins and the wires.
• Inspect the Connector: Look for physical damage or misaligned terminals.
• Test with a Known Good Component: Replace the connector with a new one to rule out manufacturing defects.

By following this documentation, users can effectively integrate the JST PH 2.54 Connector into their electronic projects, ensuring reliable and secure connections.