TSOP 1738

What Is TSOP1738?

• A miniature IR (Infrared) receiver module used to detect remote control signals.

• Designed to receive modulated IR signals at 38 kHz frequency.

• Commonly used in TV remotes, AC remotes, and Arduino IR projects.

Key Features

• 38 kHz Carrier Frequency (optimized for most IR remotes)

• Built-in Amplifier & Filter

• High Noise Immunity (rejects ambient light interference)

• Digital Output (active LOW)

• Low Power Consumption

• Compact 3-pin package

Technical Specifications

Pin Configuration

(Front view, pins downward)

• Pin 1 OUT (Signal)

• Pin 2 GND

• Pin 3 VCC

Always verify pin order from datasheet (may vary slightly by manufacturer).

How It Works

• IR remote sends modulated infrared signals (38 kHz).

• TSOP1738 receives IR light via its photodiode.

• Internal circuitry:

  • Ampmodulates 38 kHz carrier

   

• Outputs a clean digital signal.

Output Behavior

• No IR Signal Output HIGH

• IR Signal Detected Output LOW (pulses)

Output is active LOW.

Applications

• TV / AC remote decoding

• Home automation systems

• IR communication projects

• Robotics control systems

• Wireless control using IR remotes

Important Notes

• Works only with 38 kHz signals (not all IR sources).

• Avoid direct sunlight or strong IR sources.

• Use decoupling capacitor (100nF) across VCC & GND for stablight required for best performance.

Summary

• Type: IR receiver (demodulated)

• Frequency: 38 kHz

• Output: Digital (active LOW)

• Use Case: Remote control signal detection

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