How to Use B0303S-1WR3 1W Isolated DC-DC Converter 3.3V→5V: Examples, Pinouts, and Specs

The B0503S-1WR3 is a compact, high-efficiency isolated DC-DC converter manufactured by Shenzhen Hi-Link Electronic Co., Ltd. This module is designed to step up a 3.3V DC input to a stable 5V DC output, delivering up to 1W of power. Its small size and high reliability make it ideal for powering low-power devices in applications such as industrial control systems, IoT devices, and embedded systems.

• Powering microcontrollers and sensors in embedded systems
• Isolated power supply for industrial control circuits
• Voltage level conversion in IoT devices
• Medical instrumentation and portable electronics

The B0503S-1WR3 has a 4-pin SIP (Single Inline Package) configuration. The pinout is as follows:

1. Input Voltage Connection: Connect the 3.3V DC input to the VIN+ pin and the ground to the VIN- pin. Ensure the input voltage is within the specified range (3.3V ± 10%) to avoid damage.
2. Output Voltage Connection: Connect the load to the VOUT+ and VOUT- pins. The module will provide a stable 5V DC output.
3. Bypass Capacitors: For optimal performance, place a 10µF capacitor across the input pins (VIN+ and VIN-) and a 10µF capacitor across the output pins (VOUT+ and VOUT-). These capacitors help reduce noise and improve stability.
4. Isolation: The module provides 1500V DC isolation between the input and output, making it suitable for applications requiring electrical isolation.

• Load Requirements: Ensure the load does not exceed the maximum output current of 200mA.
• Thermal Management: Operate the module within the specified temperature range (-40°C to +85°C). If used in high-temperature environments, ensure adequate ventilation or heat dissipation.
• Polarity: Double-check the polarity of the input and output connections. Reversing the polarity may damage the module.
• Testing: Before integrating the module into a final design, test it on a breadboard or prototype circuit to verify performance.

The B0503S-1WR3 can be used to power an Arduino UNO from a 3.3V source. Below is an example circuit and code:

• Connect the 3.3V source to VIN+ and VIN- of the B0503S-1WR3.
• Connect the VOUT+ pin to the Arduino UNO's 5V pin.
• Connect the VOUT- pin to the Arduino UNO's GND pin.

// Example code to blink an LED using Arduino UNO powered by B0503S-1WR3
// Ensure the B0503S-1WR3 is providing a stable 5V to the Arduino UNO.

const int ledPin = 13; // Pin connected to the onboard LED

void setup() {
  pinMode(ledPin, OUTPUT); // Set the LED pin as an output
}

void loop() {
  digitalWrite(ledPin, HIGH); // Turn the LED on
  delay(1000);                // Wait for 1 second
  digitalWrite(ledPin, LOW);  // Turn the LED off
  delay(1000);                // Wait for 1 second
}

1. Can the B0503S-1WR3 be used with a 5V input?

   • No, the module is designed specifically for a 3.3V input. Using a 5V input may damage the module.

2. What is the maximum distance between the module and the load?

   • For best performance, keep the distance as short as possible to minimize voltage drops and noise.

3. Can I use this module to power a Wi-Fi module?

   • Yes, as long as the Wi-Fi module's power requirements do not exceed 5V and 200mA.

4. Is the module protected against reverse polarity?

   • No, the module does not have built-in reverse polarity protection. Always double-check connections before powering the circuit.

This concludes the documentation for the B0503S-1WR3 1W Isolated DC-DC Converter. For further assistance, refer to the manufacturer's datasheet or contact Shenzhen Hi-Link Electronic Co., Ltd.