DSS6NB32A471Q55B Datasheet, PDF (28/40 Pages) Murata Manufacturing Co., Ltd. – EMI Suppression Filters (Lead Type EMIFIL)

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Noise Suppression Effect of VFR/VFS Series
cExample of IC Protection (VFR3V)
o Testing Method
1. Put ESD surge to IC (7404 family) input terminal with
ESD simulator based on IEC 801-2.
2. Check IC's operation.
3. If IC's operation is normal, increase ESD voltage in 1kV
steps.
4. Continue above steps 1 to 3 till IC's operation becomes
abnormal.
o Result
Varistor VFR3V can protect IC from ESD.
Test Circuit
330Ω
150pF
ESD Simulator
VFR3V
Test IC
(Result)
Breakdown level
[kV]
30 min.
Without VFR3V
With use VFR3V
25
20
15
10
5
0
LS ALS AS
C
HC
AC
IC’s Family
cExample of EMI Suppression Effect
Type of Filter
Before Countermeasures
(No Filters)
Using VFR3VD31E131T51
Test Circuit
ANT
Signal
1MHz
F
ACO4
Shield
Noise Radiation Cable (50cm)
70
60
50
40
30
20
30
70
60
50
40
30
20
30
EMI Suppression Effect
90
150
210
270
330
Frequency (MHz)
90
150
210
270
330
Frequency (MHz)
26