Ultrasonic Sensors FAQQHow much power does an ultrasonic sensor consume?I know it depends on the circuit in which it is used, but when used for xx-meter detection, what are the power supply voltage and consumption current?

The impedance during resonance is approximately 400Ω. When the oscillator is driven by a single pulse at a drive voltage of 5Vpp, a current of approximately 6.3mA flows through the sensor. However, no constant current flows during distance measurement since the sensor is driven intermittently for that purpose. For example, when the oscillator is driven by 8 pulses at an interval of 100ms, duty is 0.02% and therefore the mean current is 10μA. For a receiver circuit gain of 80dB, under the above driving conditions it is possible to detect distances of up to approximately 2m