The module runs warm because of the linear regulator and continuous IR LED drive. As long as you can touch it for a few seconds without burning, it’s likely fine. If it smells or exceeds ~75°C, cut power and inspect your wiring.
John learned several valuable lessons from this experience: fc 51 ir sensor datasheet hot
Digital signal (LOW when an obstacle is detected, HIGH otherwise). Dimensions: ~3.1cm x 1.4cm (PCB size). Pin Configuration The module runs warm because of the linear