TSOP1738 38kHz IR Infrared Receiver Sensor Module (Active Low Output)

Decode remote control signals reliably with the TSOP1738 38kHz IR Receiver Sensor. Integrating a PIN photodiode, Automatic Gain Control (AGC), preamplifier, bandpass filter, and demodulator into a single epoxy-shielded DIP package, the TSOP1738 is explicitly tuned to standard 38kHz modulated infrared signals. Designed with high immunity against ambient sunlight, fluorescent light, and electromagnetic noise, it provides an active-low TTL/CMOS-compatible digital output. It is an essential component for TV/AC remote decoding, robotics line/obstacle sensing, and smart home automation projects using Arduino, ESP32, or Raspberry Pi.

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Tags TSOP1738 IR Receiver 38kHz Infrared Receiver Sensor TSOP1738 Sensor Module Remote Control IR Decoder TSOP IR Receiver Arduino 38kHz Remote Sensor TSOP1738 Pinout Infrared Receiver IC

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Product Details :

The TSOP1738 IR Receiver is a standardized infrared receiving component designed for IR remote control and wireless data transmission systems. Operating at a carrier frequency of 38kHz, it is tuned to match the modulation frequency used by standard TV, air conditioner, and set-top box remote controls.

Internally, the TSOP1738 houses a complete optical signal conditioning chain: a high-sensitivity PIN photodiode, an Automatic Gain Control (AGC) amplifier, a bandpass filter centered at $38 ext{ kHz}$ , and a PCM demodulator. When a $38 ext{kHz}$ IR light burst hits the photodiode, the module strips away the $38 ext{kHz}$ carrier frequency and produces a clean, digital demodulated pulse train on its output pin. Because of its integrated optical filter and metal shielding, it is highly resistant to false triggers caused by ambient sunlight, incandescent bulbs, or electrical noise.

Key Features and Benefits

Fully Integrated Optical Receiver: Combines photodiode, amplifier, gain control, and demodulator in a single 3-pin package.
38kHz Tuning: Tuned to the most widely used remote control carrier frequency ( $38 ext{ kHz}$ ).
Active LOW Digital Output: Output stays HIGH ( $pprox 5 ext{V}$ ) during idle, and drops LOW ( $0 ext{V}$ ) when a valid $38 ext{kHz}$ IR signal is detected.
Ambient Light Immunity: Built-in bandpass filter suppresses interference from sunlight and indoor fluorescent lighting.
Microcontroller Compatibility: Directly interfaces with $3.3 ext{V}$ and $5 ext{V}$ logic levels (TTL/CMOS compatible).

Technical Specifications

Feature Component	Specification Details
Model Designation	TSOP1738
Carrier Center Frequency	$38.0 ext{ kHz}$
Operating Supply Voltage ( $V_{S}$ )	$2.7 ext{V DC} - 5.5 ext{V DC}$ (Nominal $5.0 ext{V}$ )
Supply Current	$0.4 ext{ mA} - 1.5 ext{ mA}$ (Low Power Standby)
Output Type	Active-LOW Digital Output
Reception Distance	Up to $5 ext{m} - 10 ext{m}$ (Depending on IR transmitter power)
Detection Angle / Viewing Angle	$pm 45^circ$ (Overall $90^circ$ detection cone)
Max Data Rate	Up to $2400 ext{ bps}$
Operating Temperature	$-25^circ ext{C to } +85^circ ext{C}$

Pinout & Wiring Guide

Looking at the curved front dome of the TSOP1738 with pins pointing downward:

Pin 1 (GND / Left Pin): System Ground ( $0 ext{V}$ ).
Pin 2 ( $V_{S}$ / Middle Pin): Supply Voltage Positive ( $+5.0 ext{V DC}$ ).
Pin 3 (OUT / Right Pin): Demodulated Active-LOW Signal Output (Connect to Arduino Digital Pin 2).

STABILITY TIP: To prevent power supply ripple noise from affecting reception, place a $100 Omega$ resistor in series with Pin 2 ( $V_S$ ) and a $4.7 mu ext{F}$ decoupling capacitor between Pin 2 ( $V_S$ ) and Pin 1 ( $GND$ ) close to the sensor.

Arduino Quick-Start Code Example (Decoding IR Remote)

Use the popular IRremote library to decode button presses from any standard TV/AC remote control:

C++
#include <IRremote.hpp>

const int IR_RECEIVER_PIN = 2; // Connect TSOP1738 OUT (Pin 3) to Digital Pin 2

void setup() {
  Serial.begin(115200);
  // Start the IR receiver
  IrReceiver.begin(IR_RECEIVER_PIN, ENABLE_LED_FEEDBACK);
  Serial.println("TSOP1738 38kHz IR Receiver Ready. Press any remote button...");
}

void loop() {
  if (IrReceiver.decode()) {
    // Print the received command protocol and hex code
    Serial.print("Protocol: ");
    Serial.print(getProtocolString(IrReceiver.decodedIRData.protocol));
    Serial.print(" | Hex Code: 0x");
    Serial.println(IrReceiver.decodedIRData.decodedRawData, HEX);

    IrReceiver.resume(); // Receive the next value
  }
}

Applications

IR Remote Control Systems: Custom remote control decoding for TVs, air conditioners, and media players.
Home Automation: Controlling relays, room lights, and appliances wirelessly using ordinary IR remotes.
Robotics: Obstacle detection and line-following robots using modulated $38 ext{kHz}$ IR beacons.
Object / Security Counters: Non-contact optical beam-break tripwires for entry counters and security systems.