Wired Ultrasonic Transducers: Selection and Sourcing Guide

Ultrasonic transducers convert electrical energy into high-frequency mechanical vibrations and vice versa, forming the core sensing and actuating element in applications from industrial cleaning baths to medical imaging arrays. These piezoelectric ceramic devices excite a lead zirconate titanate (PZT) element at its resonant frequency, generating acoustic waves through air, water, or solid media. ADD Components supplies wired ultrasonic transducer elements and matched transmitter-receiver pairs from Murata, Prowave, Audiowell, and SensComp to customers across manufacturing, medical device, automotive, and marine industries. Our procurement covers standard open-type transducers for air-coupled ranging, enclosed waterproof designs for liquid-level measurement, and high-power elements for ultrasonic welding and cutting systems.

Product Types and Variants

Open-Type Air-Coupled Transducers

Open-type ultrasonic transducers are the most widely used form factor for distance measurement, object detection, and proximity sensing in air. These transducers feature a piezoelectric ceramic disc bonded to a metal diaphragm, with the active element exposed to ambient air. Murata’s MA40S4S (transmitter) and MA40S4R (receiver) are the industry-standard 40 kHz pair used in parking sensors, robotic obstacle avoidance, and industrial level sensors. With a compact 10 mm diameter housing and approximately 80-degree directivity, the MA40 series delivers reliable range up to 2-3 meters. Prowave’s 40TR12A-R is a rugged open-type 40 kHz transducer with an aluminum housing for extended-range applications, while Audiowell’s NU40C12T/R-1 offers a cost-effective transmitter-receiver pair for consumer and white-goods distance sensing.

Enclosed and Waterproof Transducers

For applications where the transducer face contacts liquid or operates in high-humidity environments, enclosed waterproof transducers provide essential protection. The piezoelectric element is hermetically sealed within a housing - typically stainless steel, aluminum, or engineered plastic - that blocks moisture while efficiently coupling acoustic energy into the target medium. Murata’s MA40H1S-R (transmitter) and MA40H1R (receiver) are enclosed 40 kHz transducers for outdoor parking sensors and AGV collision avoidance. Prowave’s 400ST/R160 waterproof pair is widely deployed in ultrasonic flow meters, water tank level monitoring, and marine depth sounding, operating reliably when fully submerged. For cleaning and processing, Prowave’s 28ST400 operates at 28 kHz with 400 W power handling, while the 25ST180 delivers 180 W at 25 kHz for industrial parts washing and degreasing systems.

High-Frequency Transducers for Precision Applications

Above the standard 40 kHz range, high-frequency transducers at 200 kHz and beyond enable higher spatial resolution at the cost of reduced range due to atmospheric attenuation. Prowave’s 200LM450P operates at 200 kHz with a narrow 6-degree beam angle, suitable for precision distance measurement, web-edge detection, and small-target detection where standard 40 kHz transducers lack angular resolution. SensComp (formerly Polaroid) offers the 600 Series instrument-grade electrostatic transducers that provide wider bandwidth than piezoelectric types for advanced ranging and non-destructive testing.

Key Selection Parameters

• Resonant Frequency: 20 kHz to 200 kHz for industrial transducers. Lower frequencies (20-28 kHz) deliver longer range for cleaning and welding. Higher frequencies (40-200 kHz) provide better resolution for distance sensing and imaging. Match transmitter and receiver frequency for maximum efficiency.

• Sound Pressure Level (SPL): Transmitter output, typically 105-120 dB at rated voltage. Higher SPL extends maximum range but may require higher drive voltage circuits.

• Receiver Sensitivity: Typically -65 to -40 dB (0 dB = 1 V/Pa). More sensitive receivers detect weaker echoes at longer ranges.

• Beam Angle (Directivity): -6 dB beam width from approximately 6 degrees (200 kHz) to 80-100 degrees (standard 40 kHz). Narrow beams improve resolution; wide beams simplify alignment in level measurement.

• Drive Voltage: Open-type transducers typically handle 10-20 Vrms continuous; higher-power types for cleaning and welding accept 100-500 Vrms. Verify your driver circuit matches the transducer’s rated range.

• Environmental Rating: IP67 or IP68 for waterproof enclosed types used in liquid-level sensing and outdoor applications. Open-type transducers require protected mounting in dusty or wet environments.

• Housing Material: Aluminum (lightweight, moderate corrosion resistance), stainless steel (chemical resistance, food-grade), or ABS/plastic (low cost, consumer-grade).

• Capacitance and Impedance: Typical 2000-2800 pF at 1 kHz for 40 kHz transducers. Matching network design must account for complex impedance at the operating frequency.

Representative Sensors We Source

Common Applications

Wired ultrasonic transducers serve as the fundamental sensing and actuating element across diverse industries. In automotive manufacturing, Murata MA40 series transducers are assembled into parking assist sensors, blind-spot detection, and automated parking systems. Industrial ultrasonic cleaning systems employ banks of Prowave 28ST400 transducers bonded to stainless steel tanks, using cavitation at 28-40 kHz to remove contaminants from precision components, medical instruments, and semiconductor wafers. Ultrasonic flow meters pair 400ST/R160 waterproof transducers in transit-time configuration, measuring liquid flow rates in water distribution, oil and gas, and chemical processing with better than 1% accuracy. In medical devices, higher-frequency PZT elements are integrated into diagnostic ultrasound probes. The food and beverage industry uses enclosed 40 kHz transducers for non-contact liquid level measurement. Marine electronics companies source SensComp and Prowave transducers for depth sounders, fish finders, and side-scan sonar.

Send Us Your Sensor Requirements

ADD Components provides comprehensive procurement support for wired ultrasonic transducers from Murata, Prowave, Audiowell, and SensComp. Our supply chain team assists with part identification, cross-reference matching, and competitive quotations for sample and production volumes. Ultrasonic transducer selection involves balancing frequency, beam pattern, power handling, environmental sealing, and cost - our application support team can help narrow the field. Contact us with your target frequency, housing preference, and quantity forecast for a tailored quotation.

Email: Info@addcomponents.hk | Phone: +852 5334 3091 | WhatsApp: +852 5334 3091

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