Noise Suppression Effect of VFR/VFS Series

cExample of IC Protection (VFR3V)

Type of Filter

Before Countermeasures

(No Filters)

Using

VFR3VD31E131T51

EMI Suppression Effect

Test Circuit

cExample of EMI Suppression Effect

Test Circuit

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.

0

LS

ALS

Without VFR3V

Breakdown level

[kV]

(Result)

With use VFR3V

AS

C

IC’s Family

HC

AC

5

10

15

20

25

30 min.

330

Ω

VFR3V

ESD Simulator

Test IC

150pF

Noise Radiation Cable (50cm)

ANT

Signal

1MHz

ACO4

Shield

F

20

30

90

150

210

270

330

30

40

50

60

70

Frequency (MHz)

20

30

90

150

210

270

330

30

40

50

60

70

Frequency (MHz)

26

• This catalog has only typical specifications. Therefore, please approve our product specifications or transact the approval sheet for product specifications before ordering.