Fc 51 Ir Sensor Datasheet Hot

Double-check your physical wiring against the standard FC-51 layout:

If the wiring is perfect and the voltage is a flawless 5V, but the board still gets hot, inspect the physical PCB. Look for tiny balls of solder bridging the pins of the LM393 chip or the legs of the LEDs. If you find a bridge, use a soldering iron and desoldering braid to clear it. If no physical short is visible, the LM393 IC itself is likely blown internally, and the module must be replaced. Best Practices for System Stability fc 51 ir sensor datasheet hot

The FC‑51 is designed to work with any microcontroller that has 3.0–6.0 V logic levels. Below are ready‑to‑use examples for Arduino, ESP32, and Raspberry Pi Pico. Double-check your physical wiring against the standard FC-51

If the resistor paired with the clear IR transmitter LED has a resistance value that is too low, the LED will draw excessive current directly from the VCC rail. If no physical short is visible, the LM393