Fc 51 Ir Sensor Datasheet Hot ✦ Real & Complete

| Parameter | Value | | :--- | :--- | | Operating Voltage | 3.3V to 5V DC | | Current Consumption | 20mA to 40mA (LED + comparator) | | Detection Distance | 2cm to 30cm (adjustable) | | Sensing Angle | 35 degrees | | Output Type | Digital (TTL) – Active Low (0V when obstacle detected) | | Comparator IC | LM393 or LM358 | | Indicator LEDs | Power (Red), Output (Green) | | PCB Dimensions | 32mm x 14mm |

“FC 51 IR sensor datasheet hot” is not a red flag—it’s a yellow one.

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. fc 51 ir sensor datasheet hot

Pro tip: For battery-powered or heat-sensitive projects, switch to a 5V supply and add a transistor to pulse the IR LED. Your sensor—and your fingers—will thank you.

Have you experienced an FC-51 melting down? Or is yours just “pleasantly warm”? Drop your experience in the comments below! | Parameter | Value | | :--- |

The FC-51 IR sensor is a compact, active infrared module designed for obstacle avoidance and proximity detection. It operates by emitting a beam of infrared light; if an object is within its path, the light reflects back to a photodiode receiver, triggering a digital output. Core Technical Specifications

The FC-51 is built around the LM393 dual comparator IC, which ensures a stable digital signal. Specification Typical Value Operating Voltage 3.0V to 6.0V DC (Standard 3.3V/5V) Current Consumption ~23 mA (at 3.3V) to ~43 mA (at 5V) Detection Range 2 cm to 30 cm (Adjustable via potentiometer) Detection Angle Approximately 35° Output Type Digital (Low: Obstacle detected, High: No obstacle) Module Dimensions 3.1 cm x 1.4 cm (PCB) Pinout and Interface “FC 51 IR sensor datasheet hot” is not

The module typically features a 3-pin male header for easy connection to microcontrollers like Arduino or Raspberry Pi.

A: Slightly warm (5–10°C above ambient) is normal. If it’s hot to the touch (>50°C), you have a defective module or are running >6V.

Before we tackle the “hot” issues, let’s review what the official (though often generic) datasheet states. Most FC 51 modules are built around the LM393 dual differential comparator and an infrared LED/phototransistor pair.

The LM393 comparator, while low-power, still dissipates energy. At 5V and 40mA, the module consumes 0.2W. This is not much, but the FC 51 has no thermal relief. The small PCB, lack of a ground plane, and proximity of the potentiometer to the LM393 cause localized heating.