How to Use R4 Minima: Examples, Pinouts, and Specs

The R4 Minima is a compact resistor designed for applications where space is a critical factor. It offers precise resistance values and low power dissipation, making it ideal for modern electronic devices that require high performance in a small form factor. Its reliability and accuracy make it a popular choice for use in consumer electronics, IoT devices, and compact circuit designs.

• Portable electronic devices (e.g., smartphones, wearables)
• IoT modules and sensors
• High-density PCBs
• Precision circuits requiring stable resistance values
• Low-power applications

The R4 Minima is available in various resistance values and tolerances to suit a wide range of applications. Below are the key technical details:

The R4 Minima is a two-terminal component with no polarity, making it easy to integrate into circuits. Below is the pin description:

1. Determine the Required Resistance Value: Select the appropriate R4 Minima resistor based on the resistance value needed for your circuit. Refer to the resistance range and tolerance in the technical specifications.
2. Placement on PCB: As an SMD component, the R4 Minima should be soldered onto the PCB pads designed for its package size. Ensure proper alignment to avoid soldering errors.
3. Power Dissipation: Verify that the power dissipation in the circuit does not exceed the resistor's power rating of 0.125 W. Use the formula: [ P = I^2 \times R ] where ( P ) is power, ( I ) is current, and ( R ) is resistance.
4. Voltage Rating: Ensure the voltage across the resistor does not exceed 200 V to prevent damage.

• Thermal Management: Avoid placing the resistor near heat-sensitive components, as it may slightly heat up during operation.
• Soldering Temperature: Use a soldering temperature below 260°C to prevent damage to the resistor.
• Testing: After soldering, test the resistance value using a multimeter to ensure proper functionality.

The R4 Minima can be used in conjunction with an Arduino UNO for various applications, such as creating a voltage divider. Below is an example of a simple voltage divider circuit:

• Two R4 Minima resistors (10 kΩ each) are used to divide a 5V input voltage into 2.5V.
• The divided voltage is read by the Arduino's analog input pin.

// Define the analog pin where the voltage divider output is connected
const int voltagePin = A0;

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

void loop() {
  int sensorValue = analogRead(voltagePin); // Read the analog value
  float voltage = sensorValue * (5.0 / 1023.0); // Convert to voltage
  Serial.print("Voltage: ");
  Serial.print(voltage);
  Serial.println(" V"); // Print the voltage value
  delay(1000); // Wait for 1 second before the next reading
}

Note: Ensure the total power dissipation of the resistors in the voltage divider does not exceed their combined power rating.

1. Incorrect Resistance Value Measured

   • Cause: Poor soldering or damaged resistor.
   • Solution: Recheck solder joints and replace the resistor if necessary.

2. Resistor Overheating

   • Cause: Exceeding the power rating.
   • Solution: Verify the power dissipation using the formula ( P = I^2 \times R ) and replace with a higher-rated resistor if needed.

3. Circuit Malfunction

   • Cause: Incorrect resistor placement or value.
   • Solution: Double-check the circuit design and ensure the correct resistor value is used.

Q: Can the R4 Minima be used in high-frequency circuits?
A: Yes, the R4 Minima is suitable for high-frequency circuits due to its low inductance and compact size.

Q: Is the R4 Minima available in different package sizes?
A: Yes, the R4 Minima is available in standard SMD sizes such as 0603, 0805, and 1206.

Q: How do I calculate the required resistor value for my circuit?
A: Use Ohm's Law (( V = I \times R )) to calculate the resistance value based on the desired voltage and current.

Q: Can I use the R4 Minima in a breadboard?
A: The R4 Minima is an SMD component and is not directly compatible with breadboards. However, you can use an SMD-to-DIP adapter for breadboard prototyping.