TCT40-16T/R 40kHz Ultrasonic Transmitter and Receiver Pair, 16mm
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Prices updated: 14 Oct 2026
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About this product
A matched pair of 40kHz ultrasonic transducers in 16mm metal cases: one transmitter (TCT40-16T) and one receiver (TCT40-16R). They are used to build distance measurement, object detection and alarm circuits, and are common in robotics projects. They need a driver circuit for the transmitter and an amplifier for the receiver to operate.
Specifications
- Sensor type
- Ultrasonic
- Frequency
- 40 kHz
- Diameter
- 16 mm
- Case
- Metal
- Sound pressure level
- 112 dB min
- Operating temperature
- -20°C to +70°C
Frequently asked questions
Can I connect these directly to an Arduino?
Not directly. The transmitter needs a 40kHz drive signal, typically through a transistor or driver stage, and the receiver signal is very weak, so it needs an amplifier before it reaches a microcontroller pin.
How do I tell the transmitter from the receiver?
The part numbers indicate the function: the suffix T is the transmitter and the suffix R is the receiver. Check the markings on each unit before wiring.
