The **TSOP393..TR1** series refers to a family of miniaturized IR receiver modules designed for infrared remote control systems. These components integrate a photodiode, preamplifier, and control circuitry into a single package. --- ### 1. Key Technical Specifications The ".." in the part number typically represents the carrier frequency (e.g., TSOP393**38** for 38kHz). | Feature | Specification | | :--- | :--- | | **Supply Voltage ($V_S$)** | 2.5 V to 5.5 V | | **Supply Current ($I_S$)** | 0.35 mA (typical) | | **Transmission Distance** | Up to 45 meters | | **Carrier Frequency** | 30 kHz to 56 kHz (depends on model) | | **Package Type** | TVCast (Surface Mount) | | **Output** | Active Low | --- ### 2. Internal Functional Blocks The device is more than just a light sensor; it is a sophisticated Integrated Circuit (IC). * **Photodetector:** High-speed PIN photodiode sensitive to infrared light (approx. 950nm). * **Preamplifier:** Converts the photodiode current into a voltage. * **Automatic Gain Control (AGC):** Adjusts sensitivity to suppress ambient noise (like sunlight or fluorescent bulbs). * **Band Pass Filter:** Only allows signals at the specific carrier frequency (e.g., 38kHz) to pass through. * **Demodulator:** Removes the carrier frequency and outputs the raw data pulses. --- ### 3. Pin Configuration and Setup The TSOP393..TR1 usually follows a standard 3-pin configuration for surface mount applications. ```mermaid graph LR A[IR Signal] --> B(TSOP393) B --> C[Pin 1: OUT] B --> D[Pin 2: GND] B --> E[Pin 3: Vs] ``` #### Application Circuitry To ensure stable operation, a simple RC filter is recommended for the supply line: * **Resistor ($R_1$):** 100 $\Omega$ (connected to $V_S$). * **Capacitor ($C_1$):** 4.7 $\mu$F (between $V_S$ and GND). --- ### 4. Naming Convention Breakdown Understanding the suffix "TR1" and the series number: * **TSOP393:** The specific series optimized for high data rates and better noise suppression (AGC3). * **36, 38, 40, etc.:** The carrier frequency in kHz. * **TR1:** Indicates "Tape and Reel" packaging, with 1000 pieces per reel, suitable for automated pick-and-place assembly. --- ### 5. Common Use Cases * **Consumer Electronics:** TV, DVD players, Air Conditioners. * **Industrial:** Light barriers, proximity sensors. * **Microcontrollers:** Interfacing with Arduino, ESP32, or Raspberry Pi for IR remote decoding.