PIEZO ALARMS
ENCASED EXTERNAL DRIVE (no internal circuitry)
PKM Series
The piezo alarms described on this
page have no “feedback” tab and are
particularly suited for the generation
of both single tones and the unusual
sound effects that are possible with
specifically designed driving circuits.
These sounds may include musical
melodies, insect sounds, etc.
All mechanical and electrical
components are designed to be
compatible with most standard
PC board assembly and wave
soldering techniques.
APPLICATIONS
I Rugged construction
I Compatible with wave soldering
techniques
I Low cost
I High reliability
I Variable tone outputs
I No EMI
PKM22EP-2001R
PKM35-4A0
PKM17EW-2001
Sound Pressure Level 75dB@10cm@3Vp-p
75dB@10cm@3Vp-p
75dB@10cm@3Vp-p
75dB@10cm@3Vp-p
72dB@10cm@3Vp-p
Oscillating Frequency 4kHz
2kHz
2kHz
4kHz
2kHz
Operating Voltage
25Vp-p
25Vp-p
25Vp-p
7Vp-p max.
OperatingTemp.Range –20°C to +70°C
–20°C to +70°C
–40°C to +125°C
–20°C to +70°C
–20°C to +70°C
Storage Temp.Range
–30°C to +80°C
–40°C to +80°C
–40°C to +125°C
–30°C to +80°C
–30°C to +80°C
Capacitance
12,000pF ± 30%
at 1kHz
17,000pF ± 30%
at 120Hz
17,000pF ± 30%
at 120Hz
9,500pF ± 30%
at 1kHz
40,000pF ± 30%
at 120Hz
Leads
—
—
—
32AWG (UL-1685)
PIEZO ALARMS
I Musical toys
I Home appliances (microwave
ovens, refrigerators, etc.)
I Communications equipment
I Computer peripherals and office
equipment
I Instrumentation, etc.
PKM22EP-2001
32AWG (UL-1685)
Part Number
PKM22EPP-4001*
FEATURES
25Vp-p
DIMENSIONS: mm
12.6
20
10.5
4.7 8.0
4.8
terminal
16.8 ± 0.2 D.
1.6
16.8 ± 0.2 Dia.
Dia. 22.0
0.8
R1.0
11.0
5.0
4.0
22.0 Dia.
0.4
4.0
8.3
A
7.0
6.5
70.0 ± 5.0
1.2
100.0 ± 10.0
10.0 ± 0.5
2–1.2 Dia.
Detail of A
3.0 ± 1.0
5±2
2–3.5
Dia.
10.0
0.5
2.0
3.5
0.2
0.4
0.75
2.5
3.5
5.0
4.0
+0
–0.3
7.0
1.3
1.2
1.5
+0
–0.3
80
70
60
100
500 1k
5k 10k 20k
Frequency (Hz)
Input Voltage: Square wave 3Vp-p
Measuring Distance: 10cm
85.0
75.0
65.0
55.0
45.0
0.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10.0
Frequency (Hz)
Input Voltage: Square wave 3Vp-p
Measuring Distance: 10cm
Sound Pressure Level (dB)
90
Sound Pressure Level (dB)
105.0
95.0
100
SPL (dB)
SOUND PRESSURE
LEVEL VS.
FREQUENCY
Sound Pressure Level (dB)
Tolerance: ± 0.5
100
90
90
80
70
1 2
3 4 5 6 7 8 9
Frequency (kHz)
Input Voltage: Square wave 3Vp-p
Measuring Distance: 10cm
80
70
60
50
40
0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.010.0
Frequency (kHz)
Input Voltage: Square wave 3Vp-p
Measuring Distance: 10cm
*These parts are available as sealed units for washing with tape covering the sound emitting hole. The part number should have an “S” suffix added.
Available as standard through authorized Murata Electronics Distributors.
CG01-J
411
