Murata MA40S4S Ultrasonic Sensor Transmitter, 0.2-4m Range, 40kHz

The Murata MA40S4S is a high-performance ultrasonic sensor transmitter designed for a variety of precision detection applications. Constructed from piezoelectric ceramics, a metal plate, a resonator, and a protective resin case, this sensor efficiently generates and transmits ultrasonic waves. Its unique funnel-shaped resonator concentrates the waves, projecting them into the air with high efficiency and sensitivity for reliable operation.

A key specification is its high sound pressure level (S.P.L.) of 120dB typ., which is crucial for applications like distance measurement, as it enables the detection of objects at greater ranges. With a compact diameter of just 10.0mm and an 80° beam angle, it offers a focused detection field suitable for integration into space-constrained designs.

Core Features & Applications

This transmitter is engineered for versatility and reliability in industrial and commercial settings. It is ideally suited for object detection, precise distance measurement, and dynamic body detection systems. Its high sensitivity and robust sound pressure output ensure consistent performance in demanding environments.

Important Specifications & Notes

• Centre Frequency: 40kHz
• Capacitance: 2550pF with a ±20% tolerance
• Maximum Input Voltage: 20Vp-p for continuous square wave signals
• Operating Temperature Range: -40°C to +85°C
• Sensing Range: 0.2 metres (min) to 4 metres (max)

Please Note: Due to its open-type construction, this sensor is not recommended for use in outdoor applications where it could be exposed to moisture, dust, or other environmental contaminants. It is designed for controlled indoor or protected environments where its high performance can be fully utilised.

With its compact form factor, wide operating temperature range, and high output characteristics, the Murata MA40S4S provides an excellent