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
Parameter
Value
Operating Voltage
2.5 V – 5.5 V
Carrier Frequency
38 kHz
Output Type
Digital
Current Consumption
~0.5 mA to 1.5 mA
Reception Distance
Up to ~10–15 meters
Operating Temperature
–25°C to +85°C
⚙️ 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:
Amplifies signal
Filters noise
Demodulates 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 stable operation.
Line-of-sight required for best performance.
🛠 Summary
Type: IR receiver (demodulated)
Frequency: 38 kHz
Output: Digital (active LOW)
Use Case: Remote control signal detection