Murata MA40S4R 40kHz Plugin Ultrasonic Receiver & Transmitter

The MA40S4R is a passive piezoelectric element and does not have a fixed operating voltage. It requires an external driver circuit to generate the high-voltage AC signal (typically tens to hundreds of volts peak-to-peak at 40kHz) for transmission. For reception, its output is a low-voltage AC signal that must be amplified and conditioned by a receiver circuit. Always consult the official Murata datasheet for recommended driving and receiving circuit designs.

Yes, the MA40S4R is designed as a dual-purpose transducer. It can efficiently convert electrical energy into 40kHz acoustic waves for transmission and convert incoming 40kHz acoustic echoes back into electrical signals for reception. This makes it a core component in monostatic ultrasonic sensor systems where a single element handles both functions, often with a switching circuit to alternate between transmit and receive modes.

While the exact beam pattern is detailed in the manufacturer's datasheet, standard 40kHz ultrasonic transducers like the MA40S4R typically exhibit a moderately wide beam angle, often in the range of 60 to 80 degrees. This provides a good balance between detection coverage and directivity for general-purpose ranging and detection. For applications requiring a narrower beam, an acoustic horn or waveguide can be added to the transducer face.

The MA40S4R features plugin terminals designed for through-hole PCB mounting or direct soldering to wires. Ensure a secure mechanical mount that does not dampen the front ceramic face, as this is critical for acoustic performance. Use the recommended solder profile to avoid damaging the piezoelectric element. For optimal performance, integrate it into a housing that protects the element while allowing clear acoustic transmission, and follow proper circuit layout guidelines to minimize electrical noise.