Ultrasonic Transducers Date: 7/26/05

Dimensions: mm (In.)

Part Number:
255-400ET18 255-400ER18

17.50
Aluminum (.689)
Case

10±.304
ø18 (.394±.012)
(ø.709)

Diaphragm ø1.19x2
13.48 (ø.047x.079)
(.531)
Ultrasonic Transducers Page 1 of 2

Transmitter
Directivity 0º
330º 30º

300º 60º

270º -40º 90º

-30º

240º -20º 120º

-10º
210º -0º 150º

180º

KT-400049

Electrical Specifications: Mechanical Specifications:

• Center frequency (f0): 40.0KHz ± 1.0KHz • Type: Transmitter: 255-400ET18
• SPL @ f0: 115dB (0dB re 0.0002 µ bar) Receiver: 255-400ER18
• Sensitivity @ f0: -70dB (0dB = 1V/µ bar) • Operating temperature: -30°C ~ +80°C
• Bandwidth: 1.5KHz (-6dB) • Storage temperature: -40°C ~ +100°C
• Capacitance @ 1KHz: 2,600pF ± 20%
• Allowable input power: 0.2W
Material:
• Input voltage: 20V max.
• Water Resistant

Available from Mouser Electronics www.mouser.com (800) 346-6873

Specifications are subject to change without notice. No liability or warranty implied by this information. Environmental compliance based on producer documentation.
 Ultrasonic Transducers Date: 7/26/05

Part Number:
255-400ET18 255-400ER18

Sensitivity (255-400ER18)

-50

-60

-70
dB
-80
Ultrasonic Transducers (Page 2 of 2

-90

-100
35 36 37 38 39 40 41 42 43 44 45
KHz

Sound Pressure Level (255-400ET18)

130

120

110
dB
100

90

80
35 36 37 38 39 40 41 42 43 44 45
KHz

Impedance & Phase Angle vs. Frequency

1E+05 90

45
1E+04

Ohm 0

1E+03
-45

1E+02 -90
35 36 37 38 39 40 41 42 43 44 45
KHz

Available from Mouser Electronics www.mouser.com (800) 346-6873

Specifications are subject to change without notice. No liability or warranty implied by this information. Environmental compliance based on producer documentation.