The **MA7HTBA-R** is a specific part number belonging to a high-precision sensor series, primarily manufactured by **Murata Electronics**. It is classified as an **Ultrasonic Sensor**, specifically a high-frequency transducer used for distance measurement and object detection. --- ## 1. Technical Specifications The "MA" series from Murata typically represents ultrasonic transducers. Below are the common specifications associated with this specific model range: | Feature | Specification | | :--- | :--- | | **Part Type** | Ultrasonic Transducer (Open Structure) | | **Center Frequency** | 40.0 kHz (typical) | | **Directivity** | ~80 degrees | | **Capacitance** | ~2,550 pF | | **Sound Pressure Level** | 100 dB min. (at 10Vrms, 30cm) | | **Operating Temperature** | -30°C to +85°C | | **Mounting Type** | Through-hole / Lead pins | --- ## 2. Component Structure and Operation The MA7HTBA-R operates on the principle of **Piezoelectricity**. ### How it works: 1. **Piezoelectric Element:** Inside the metal casing is a ceramic disc. When an AC voltage is applied, the disc vibrates. 2. **Acoustic Matching:** The vibrations are transferred to the air, creating ultrasonic waves (beyond human hearing). 3. **Transmitter vs. Receiver:** While some units are dedicated, many in this series are "open type," meaning they can function as both a speaker (transmitter) and a microphone (receiver). 4. **The "R" Suffix:** Usually denotes **RoHS compliance** (Lead-free) or specific packaging requirements (like Radial Taping). --- ## 3. Key Applications These components are widely used in industrial and consumer electronics for non-contact sensing: * **Distance Measurement:** Used in "Time-of-Flight" (ToF) calculations to determine how far an object is based on echo return. * **Obstacle Avoidance:** Common in small robotics and automated guided vehicles (AGVs). * **Liquid Level Sensing:** Detecting the surface level of liquids in tanks without physical contact. * **Parking Sensors:** Assisting in automotive proximity detection. --- ## 4. Design Considerations If you are integrating the MA7HTBA-R into a circuit, keep the following in mind: ### Drive Circuitry You will typically need a **Microcontroller (MCU)**, a **transistor/MOSFET driver** to provide sufficient voltage, and a **high-gain amplifier** (Operational Amplifier) for the receiving end to process the tiny returning signals. ### Environmental Factors * **Dust/Moisture:** Because this is an "Open Type" sensor (indicated by the mesh/open top), it is sensitive to moisture and dust. For outdoor or harsh environments, "Closed Type" (waterproof) sensors are usually preferred. * **Temperature Compensation:** The speed of sound changes with temperature. For high accuracy, you should include a temperature sensor in your design to calibrate the distance calculations. ---