The TSOP17xx series are miniaturized receivers for infrared remote control systems. PIN diode and preamplifier are assembled on lead frame, the epoxy package is designed as IR filter.The demodulated output signal can directly be decoded by a microprocessor. TSOP17xx is the standard IR remote control receiver series, supporting all major transmission codes.
TSOP1738 is sensitive to 38 KHz frequency. They have band pass filter inbuilt so ambient light will not cause any harm and this sensor will react only at 38 KHz infrared signal.