The **TSOP131..P16TR** series represents a family of miniaturized IR receiver modules designed for infrared remote control systems. These components integrate a photodiode and a preamplifier into a single lead frame, which acts as a bandpass filter to provide immunity against ambient light disturbances. --- ### 1. Key Technical Specifications Below is a summary of the typical technical parameters for this series: | Parameter | Specification | | :--- | :--- | | **Supply Voltage ($V_S$)** | 2.5 V to 5.5 V | | **Supply Current ($I_S$)** | 0.35 mA (typical) | | **Carrier Frequency ($f_o$)** | 30 kHz to 56 kHz (depends on model) | | **Transmission Distance** | Up to 45 meters | | **Directivity** | $\pm 45^\circ$ (Half angle) | | **Package Type** | Belobog (Surface Mount - SMD) | --- ### 2. Internal Block Diagram Functional Components The device is not just a sensor; it is an Integrated Circuit (IC). Its internal architecture consists of: 1. **Photodetector:** A high-sensitivity PIN photodiode. 2. **Preamplifier:** Boosts the weak signal from the photodiode. 3. **Automatic Gain Control (AGC):** Adjusts sensitivity to suppress noise from fluorescent lamps or sunlight. 4. **Bandpass Filter:** Filters out all frequencies except the specific carrier frequency (e.g., 38kHz). 5. **Demodulator:** Removes the carrier wave and outputs a clean digital data signal. --- ### 3. Part Number Breakdown (TSOP131..P16TR) The suffix provides specific information about the packaging and frequency: * **TSOP131**: The base series name (low power consumption, high suppression of optical noise). * **[..]**: Two digits representing the carrier frequency (e.g., `38` for 38kHz, `56` for 56kHz). * **P16**: Refers to the physical package style and lead orientation. * **TR**: Indicates "Tape and Reel" packaging, intended for automated Pick-and-Place assembly. --- ### 4. Circuit Application Example The TSOP131 series is designed to interface directly with a Microcontroller (MCU). ```cpp // Typical Hardware Connection // Pin 1: OUT -> Connect to Digital Input of MCU (Internal Pull-up recommended) // Pin 2: GND -> System Ground // Pin 3: V_S -> 3.3V or 5V Supply (Add a 100uF cap + 100 Ohm resistor for noise filtering) ``` --- ### 5. Main Features * **Low Power:** Extremely low supply current makes it ideal for battery-operated devices. * **Insensitive to Supply Voltage Ripple:** Operates stably even if the power supply is "noisy." * **TTL/CMOS Compatibility:** The output signal can be read directly by Arduino, ESP32, or STM32 boards. * **EMI Shielding:** Internal metal shielding helps prevent electromagnetic interference.