How to Use MBR20100CT: Examples, Pinouts, and Specs

The MBR20100CT is a Schottky barrier rectifier diode designed for high-efficiency rectification in power supply circuits and other electronic applications. With a maximum reverse voltage of 100V and a forward current rating of 20A, it is ideal for applications requiring low forward voltage drop and high current handling. Its dual-diode configuration in a TO-220AB package makes it suitable for use in switching power supplies, freewheeling diodes, and polarity protection circuits.

• Switching power supplies
• DC-DC converters
• Battery chargers
• Freewheeling diodes in motor control circuits
• Polarity protection in electronic devices

The MBR20100CT consists of two Schottky diodes in a common cathode configuration. The pinout for the TO-220AB package is as follows:

Below is a simplified representation of the TO-220AB package pinout:

   _______
  |       |
  |       |
  |_______|
   | | |
   1 2 3

1. Rectification: The MBR20100CT is commonly used in full-wave rectifier circuits. Connect the anodes (Pin 1 and Pin 3) to the AC input and the cathode (Pin 2) to the positive DC output.
2. Polarity Protection: Place the MBR20100CT in series with the power supply input to prevent damage from reverse polarity.
3. Freewheeling Diode: Use the MBR20100CT across inductive loads (e.g., motors) to suppress voltage spikes during switching.

• Heat Dissipation: The MBR20100CT can handle high currents, but it generates heat during operation. Use an appropriate heatsink to maintain safe operating temperatures.
• Voltage Ratings: Ensure the reverse voltage does not exceed 100V to prevent damage to the diode.
• Current Ratings: Do not exceed the maximum forward current of 20A. For continuous operation, consider derating to account for thermal conditions.

The MBR20100CT can be used in circuits interfacing with an Arduino UNO, such as a polarity protection circuit for the Arduino's power input. Below is an example circuit and code for monitoring the voltage after rectification.

• Connect the MBR20100CT in series with the Arduino's power input (Vin pin).
• Use a voltage divider to step down the rectified voltage for measurement by the Arduino's analog input.

// Example code to read rectified voltage using Arduino UNO
// Ensure the voltage divider output does not exceed 5V for safe ADC input

const int voltagePin = A0; // Analog pin connected to the voltage divider
float voltage = 0.0;       // Variable to store the measured voltage

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

void loop() {
  int adcValue = analogRead(voltagePin); // Read ADC value (0-1023)
  
  // Convert ADC value to voltage
  // Assuming a 10:1 voltage divider and 5V reference voltage
  voltage = (adcValue * 5.0 / 1023.0) * 10.0;
  
  // Print the measured voltage to the Serial Monitor
  Serial.print("Rectified Voltage: ");
  Serial.print(voltage);
  Serial.println(" V");
  
  delay(1000); // Wait for 1 second before the next reading
}

1. Excessive Heat Generation

   • Cause: High forward current or insufficient heatsinking.
   • Solution: Use a larger heatsink or improve airflow around the component.

2. High Reverse Leakage Current

   • Cause: Operating near the maximum reverse voltage or at high temperatures.
   • Solution: Ensure the reverse voltage is well below 100V and operate within the specified temperature range.

3. Diode Failure

   • Cause: Exceeding voltage or current ratings.
   • Solution: Verify circuit design and ensure proper derating for safe operation.

Q: Can I use the MBR20100CT for AC rectification?
A: Yes, the MBR20100CT is suitable for AC rectification in full-wave or half-wave rectifier circuits.

Q: What is the maximum operating temperature for the MBR20100CT?
A: The maximum operating temperature is +150°C. Ensure proper cooling to avoid exceeding this limit.

Q: Can I use the MBR20100CT without a heatsink?
A: It is not recommended for high-current applications. A heatsink is necessary to dissipate heat effectively.

Q: How do I connect the MBR20100CT in a full-wave rectifier?
A: Use two MBR20100CT diodes in a bridge configuration or a single MBR20100CT for a center-tapped transformer.

This concludes the documentation for the MBR20100CT.