The **TSOP372..H_V01** series (often categorized under the TSOP37xxx family) is a collection of miniaturized IR receiver modules designed for infrared remote control systems. These parts integrate a PIN diode and a preamplifier into a single lead frame, encapsulated in an epoxy package that acts as an IR filter. --- ### 1. Key Technical Specifications The following table highlights the general electrical and optical characteristics of the TSOP372 series: | Feature | Specification | | :--- | :--- | | **Supply Voltage ($V_S$)** | 2.5 V to 5.5 V | | **Supply Current ($I_S$)** | 0.35 mA (typical) | | **Carrier Frequency ($f_0$)** | 30 kHz to 56 kHz (model dependent) | | **Transmission Distance** | Up to 45 meters | | **Directivity** | $\pm 45^\circ$ (Half angle) | | **Output Type** | Active Low (CMOS/TTL compatible) | --- ### 2. Internal Architecture The device consists of several critical functional blocks that process the incoming infrared light: 1. **PIN Photodiode:** Converts infrared light pulses into an electrical signal. 2. **Preamplifier:** Boosts the weak signal from the photodiode. 3. **Automatic Gain Control (AGC):** Adjusts sensitivity to compensate for ambient light noise and varying distances. 4. **Band Pass Filter:** Specifically tuned to the carrier frequency (e.g., 38 kHz) to suppress interference from sunlight or fluorescent lamps. 5. **Demodulator:** Removes the carrier frequency and outputs the clean data envelope. --- ### 3. Pin Configuration The physical layout typically follows the **Heimann (H)** mold package style: | Pin Number | Symbol | Function | | :--- | :--- | :--- | | 1 | **OUT** | Demodulated data output (Active Low) | | 2 | **GND** | Ground connection | | 3 | **$V_S$** | Positive supply voltage | --- ### 4. Implementation Circuit To ensure stable operation and noise immunity, a basic RC filter is recommended at the supply pin: ```c // Basic Circuit Representation // [V_S] ---- [R1: 100 Ohm] ----+---- [Pin 3: Vs] // | // [C1: 0.1uF] // | // [GND] -----------------------+---- [Pin 2: GND] ``` --- ### 5. Application Usage The **TSOP372** is optimized for data formats with long bursts and high noise immunity (such as the NEC or RC5 protocols). It is commonly found in: * Consumer electronics (TVs, DVD players, Air Conditioners). * PC and Interactive Whiteboard peripherals. * Industrial automation remote triggers.