CERAMIC CAPACITORS

47

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General characteristics

Page revised 02/21

X7R DIELECTRICS (CLASS 2)

They are mainly made of barium titanate modified by various oxides to achieve

the electrical properties required. A specific ceramic dielectric is used to

achieve an excellent dielectric strength. High dielectric constant enables to

achieve high capacitance values.

For optimum use, the specific properties of barium titanate in function of the

different parameters must be taken into account.

See the variations illustrated in figures below:

–20

–10

–40

–30

+30

+20

+10

0

–55–40

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155

(°C)

∆C/C (%)

1102

10

103

55

22

2

55

–10

0

+ 5

–5

N (kHz)

∆C/C (%)

–80

0

20

40

60

80

100

–60

–40

–20

0

∆C/C (%)

Percentage of rated voltage (%)

Standard range

Extended range

General Information

X7R: CAPACITANCE CHANGE VS TEMPERATURE

X7R: CAPACITANCE CHANGE VS FREQUENCY

CHANGE VS PERCENTAGE OF RATED VOLTAGE APPLIED

1

103

5

2

102

5

2

10

5

2

–55–40

02085125

155

IR (G )

(°C)

X7R: INSULATION RESISTANCE VS TEMPERATURE