PIEZO ALARMS
ENCASED EXTERNAL DRIVE (no internal circuitry)
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.
PKM Series
FEATURES
I Rugged construction
I Compatible with wave soldering
techniques
I Low cost
I High reliability
I Variable tone outputs
I No EMI
APPLICATIONS
I Musical toys
I Home appliances (microwave
ovens, refrigerators, etc.)
I Communications equipment
I Computer peripherals and office
equipment
I Instrumentation, etc.
Part Number
PKM22EPP-4001*
PKM22EP-2001
PKM22EP-2001R
Sound Pressure Level 75dB@10cm@3Vp-p
75dB@10cm@3Vp-p 75dB@10cm@3Vp-p
Oscillating Frequency 4kHz
2kHz 2kHz
Operating Voltage 25Vp-p
25Vp-p
25Vp-p
OperatingTemp.Range –20°C to +70°C
–20°C to +70°C
–40°C to +125°C
Storage Temp.Range –30°C to +80°C
–40°C to +80°C
–40°C to +125°C
Capacitance
12,000pF ± 30%
at 1kHz
17,000pF ± 30%
at 120Hz
17,000pF ± 30%
at 120Hz
Leads
—
——
DIMENSIONS: mm
terminal
0.8
R1.0 22.0 Dia.
0.4
7.0
6.5
1.2
10.0 ± 0.5
2–1.2 Dia.
10.5
4.8
12.6
20
4.7 8.0
1.6
Dia. 22.0
11.0
4.0
5.0
4.0
8.3
A
Detail of A
2–3.5
Dia.
10.0 0.5
2.0 3.5
0.2 1.3
0.4
0.75
2.5 1.2
1.5
3.5
5.0
Tolerance: ± 0.5
PKM35-4A0
75dB@10cm@3Vp-p
4kHz
25Vp-p
–20°C to +70°C
–30°C to +80°C
9,500pF ± 30%
at 1kHz
32AWG (UL-1685)
PKM17EW-2001
72dB@10cm@3Vp-p
2kHz
7Vp-p max.
–20°C to +70°C
–30°C to +80°C
40,000pF ± 30%
at 120Hz
32AWG (UL-1685)
16.8 ± 0.2 D.
16.8 ± 0.2 Dia.
100.0 ± 10.0
5±2
4.0
+0
–0.3
70.0 ± 5.0
3.0 ± 1.0
7.0
+0
–0.3
SOUND PRESSURE
LEVEL VS.
FREQUENCY
100
90
80
70
60
100
500 1k
5k 10k 20k
Frequency (Hz)
Input Voltage: Square wave 3Vp-p
Measuring Distance: 10cm
105.0
95.0
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
90
80
70
1 2 3 4 5 678 9
Frequency (kHz)
Input Voltage: Square wave 3Vp-p
Measuring Distance: 10cm
100
90
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
