How to Use XT90-BIG: Examples, Pinouts, and Specs

The XT90-BIG is a high-current connector designed for use in RC (radio-controlled) applications and other high-power setups. It is widely recognized for its robust design, reliability, and ability to handle high currents up to 90A. The XT90-BIG ensures secure connections with minimal voltage drop, making it ideal for demanding applications such as electric vehicles, drones, and high-performance battery packs.

• RC vehicles (cars, boats, planes, and drones)
• High-power battery packs for electric vehicles
• Solar power systems
• High-current DC power distribution
• Industrial equipment requiring secure, high-current connections

The XT90-BIG connector consists of two main terminals: Positive (+) and Negative (-). These terminals are clearly marked on the connector housing to prevent reverse polarity connections.

1. Prepare the Wires: Strip the insulation from the wires you intend to connect to the XT90-BIG. Ensure the wire gauge is between 10-12 AWG for optimal performance.
2. Solder the Wires:
   • Heat the soldering iron to an appropriate temperature (around 350°C).
   • Tin the exposed wire ends and the XT90-BIG terminals with solder.
   • Insert the tinned wire into the terminal and apply heat until the solder flows and creates a secure connection.
3. Assemble the Connector: Once the solder joints cool, slide the connector housing over the terminals to complete the assembly.
4. Connect to the Circuit: Plug the XT90-BIG connectors together, ensuring the positive and negative terminals align correctly.

• Polarity Check: Always double-check the polarity markings on the connector to avoid reverse polarity connections, which can damage your circuit.
• Soldering Precautions: Avoid overheating the terminals during soldering, as excessive heat can deform the nylon housing.
• Secure Connections: Ensure the connectors are fully mated to prevent loose connections, which can lead to arcing or increased resistance.
• Wire Gauge: Use the recommended wire gauge (10-12 AWG) to handle the rated current without overheating.
• Heat Shrink Tubing: Use heat shrink tubing over the soldered connections for added insulation and strain relief.

While the XT90-BIG is not directly connected to an Arduino, it can be used to supply power to an Arduino-based system. Below is an example of how to use the XT90-BIG in a power distribution setup for an Arduino UNO:

// Example Arduino code for a power distribution system
// This code assumes the XT90-BIG is used to connect a battery to a power
// distribution board, which powers the Arduino UNO and other components.

void setup() {
  // Initialize the Arduino system
  Serial.begin(9600); // Start serial communication at 9600 baud
  pinMode(13, OUTPUT); // Set pin 13 as an output (e.g., for an LED)
}

void loop() {
  // Example: Blink an LED to indicate the system is powered
  digitalWrite(13, HIGH); // Turn the LED on
  delay(1000);            // Wait for 1 second
  digitalWrite(13, LOW);  // Turn the LED off
  delay(1000);            // Wait for 1 second
}

Q: Can the XT90-BIG handle currents above 90A?
A: The XT90-BIG can handle peak currents of up to 120A for short durations. However, for continuous operation, it is recommended to stay within the 90A rating to avoid overheating.

Q: Is the XT90-BIG waterproof?
A: No, the XT90-BIG is not waterproof. If you need to use it in wet environments, consider additional waterproofing measures such as heat shrink tubing with adhesive or a waterproof enclosure.

Q: Can I use smaller gauge wires with the XT90-BIG?
A: It is not recommended to use wires smaller than 12 AWG, as they may not handle the rated current and could lead to overheating or voltage drops.

Q: How do I disconnect the XT90-BIG connectors?
A: Firmly grip both connectors and pull them apart. Avoid pulling on the wires to prevent damage.

By following this documentation, you can effectively use the XT90-BIG connector in your high-power applications with confidence and reliability.