The **TSOP931..P16TR** series refers to high-performance miniaturized IR receiver modules designed for infrared remote control systems. These components integrate a photodiode and a preamplifier into a single lead frame, encapsulated in an epoxy package that acts as an IR filter. --- ## 1. Core Component Breakdown | Feature | Description | | :--- | :--- | | **Component Type** | Integrated IR Receiver (Photodiode + IC) | | **Preamplifier** | Internal AGC (Automatic Gain Control) for noise suppression | | **Output Type** | Active Low (The output drops to 0V when an IR signal is detected) | | **Shielding** | Internal metal shielding against EMI (Electromagnetic Interference) | | **Carrier Frequency** | Available in variants (e.g., 30kHz to 56kHz) | --- ## 2. Technical Specifications | Parameter | Typical Value | | :--- | :--- | | **Supply Voltage ($V_S$)** | 2.0 V to 3.6 V (Low power design) | | **Supply Current ($I_S$)** | ~0.35 mA (Ideal for battery-operated devices) | | **Transmission Distance** | Up to 40 meters | | **Directivity** | $\pm 45^\circ$ (Half angle) | | **Dimensions** | 5.3 mm x 3.2 mm x 4.0 mm | --- ## 3. Package and Suffix Meaning The part number follows a specific nomenclature used by Vishay: * **TSOP931**: The base series. The "93" indicates the specific internal AGC circuitry (AGC1, AGC2, etc., optimized for different noise environments). * **P16**: Refers to the physical package style (often the **Heimdall** package or specific SMD orientation). * **TR**: Stands for **Tape and Reel**, indicating the packaging method for automated SMT (Surface Mount Technology) assembly. --- ## 4. Typical Application Circuit To ensure the stability of the TSOP931, a simple RC filter is recommended at the power supply pin ($V_S$). ```text V_S (2V - 3.6V) | [R1: 100 Ohm] | +-------+----------- Pin 3 (Vs) | | [C1: 4.7uF] [TSOP931] | | GND Pin 2 (GND) -------- GND | Pin 1 (OUT) -------- Microcontroller GPIO ``` --- ## 5. Key Advantages 1. **Noise Immunity**: Extremely robust against disturbance from fluorescent lamps and Wi-Fi signals. 2. **Low Voltage**: Specifically designed to work with 3V lithium coin cells or 2x AAA batteries. 3. **No External Components**: Other than a decoupling capacitor, it requires no external components to process the IR signal.