How to Use tcr1500: Examples, Pinouts, and Specs

The TCR1500, manufactured by QW (Part ID: SD), is a precision temperature coefficient resistor designed for high accuracy in temperature sensing applications. This component is engineered to provide stable resistance over a wide temperature range, ensuring reliable performance in circuits requiring precise temperature measurements. Its robust design and high accuracy make it a preferred choice for industrial, automotive, and consumer electronics applications.

• Temperature sensing and compensation circuits
• Precision measurement systems
• Industrial process control
• Automotive temperature monitoring
• Consumer electronics requiring thermal stability

• Resistance Range: 1 kΩ to 10 kΩ (varies by model)
• Temperature Coefficient: ±5 ppm/°C
• Operating Temperature Range: -55°C to +155°C
• Tolerance: ±0.1%
• Power Rating: 0.25 W (at 70°C)
• Maximum Voltage: 200 V
• Stability: Long-term drift < 0.05% per 1,000 hours
• Package Type: Axial or SMD (Surface Mount Device)

The TCR1500 is a two-terminal resistor. Below is the pin configuration:

1. Determine the Resistance Value: Select the appropriate resistance value (e.g., 1 kΩ, 5 kΩ) based on your circuit requirements.
2. Connect the Terminals:
   • Terminal 1 should be connected to the input side of the circuit.
   • Terminal 2 should be connected to the output side or ground, depending on the circuit design.
3. Ensure Proper Power Rating: Verify that the power dissipation in the resistor does not exceed its rated 0.25 W at 70°C.
4. Temperature Compensation: Use the TCR1500 in circuits where precise temperature compensation is required, such as Wheatstone bridges or voltage dividers.

• Avoid Overheating: Ensure the resistor operates within its specified temperature range (-55°C to +155°C) to maintain accuracy.
• Minimize Noise: Place the resistor away from high-frequency or high-power components to reduce noise interference.
• Soldering Precautions: When soldering, use a temperature-controlled soldering iron to avoid thermal damage to the resistor.
• Use in Arduino Projects: The TCR1500 can be used in temperature sensing circuits with an Arduino UNO. Below is an example code snippet for reading temperature using the TCR1500 in a voltage divider configuration.

// Example Arduino Code for Reading Temperature with TCR1500
// Assumes TCR1500 is part of a voltage divider circuit connected to A0

const int sensorPin = A0; // Analog pin connected to the voltage divider
float referenceVoltage = 5.0; // Reference voltage of the Arduino
float resistorValue = 10000.0; // Resistance of the fixed resistor in ohms

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

void loop() {
  int sensorValue = analogRead(sensorPin); // Read the analog value
  float voltage = (sensorValue / 1023.0) * referenceVoltage; 
  // Calculate the resistance of the TCR1500
  float tcrResistance = (resistorValue * voltage) / (referenceVoltage - voltage);

  // Print the resistance value to the Serial Monitor
  Serial.print("TCR1500 Resistance: ");
  Serial.print(tcrResistance);
  Serial.println(" ohms");

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

1. Inaccurate Resistance Readings:

   • Cause: Operating outside the specified temperature range.
   • Solution: Ensure the ambient temperature is within -55°C to +155°C.

2. Overheating:

   • Cause: Exceeding the power rating of 0.25 W.
   • Solution: Reduce the current through the resistor or use a resistor with a higher power rating.

3. Noise in Measurements:

   • Cause: Placement near high-frequency components.
   • Solution: Relocate the resistor or use shielding to minimize interference.

4. Soldering Damage:

   • Cause: Excessive heat during soldering.
   • Solution: Use a temperature-controlled soldering iron and limit soldering time.

Q1: Can the TCR1500 be used in high-frequency circuits?
A1: While the TCR1500 is primarily designed for precision temperature sensing, it can be used in high-frequency circuits if proper noise reduction techniques are applied.

Q2: What happens if the resistor is exposed to temperatures beyond its operating range?
A2: Exceeding the specified temperature range may result in permanent damage or a significant drift in resistance value.

Q3: Is the TCR1500 available in different resistance values?
A3: Yes, the TCR1500 is available in a range of resistance values from 1 kΩ to 10 kΩ. Check the datasheet for specific part numbers.

Q4: Can I use the TCR1500 with a 3.3V microcontroller?
A4: Yes, the TCR1500 can be used with a 3.3V microcontroller, but ensure the voltage divider circuit is designed accordingly.

By following this documentation, users can effectively integrate the TCR1500 into their projects and achieve precise temperature measurements.