Document Number: 13013

www.vishay.com

Revision: 11-Aug-10

1

DC Filter Capacitors

ER

Vishay ESTA

TYPE ER

Capacitors offer unusually good electrical characteristics,

coupled with very small size. The ER range of capacitors are

manufactured using a mixed dielectric material that consists

of polyester/polypropylene. The container is a rolled

seamed tinplate case that is hermetically sealed. The

construction is designed to prevent internal movement

when subjected to shock and vibration.

Note

• The impregnant used is a non toxic highly refined, purified and

inhibited mineral oil.

APPLICATIONS

The ER range of capacitors are specifically designed for DC

applications.

• Audio coupling

• Pulse forming networks

• Oscillator circuits

• Arc and spark suppression

•RF by-pass

• Tuned filters

• Energy storage

• Integrating circuits

• Low and high pass filters

• High voltage smoothing

Capacitors required for AC applications and high discharge

rates can also be designed from the ER range.

Consult Vishay Electronic GmbH, Division Roederstein

ESTA and Hybrids for your specific requirements.

TEMPERATURE RANGE

Temperature range is - 55 °C to + 85 °C. The nominal

voltage rating is applicable from - 55 °C to + 85 °C.

Derating is required for higher operating temperatures.

TEMPERATURE COEFFICIENT

Capacitance will increase by 2 % per 100 °C temperature

change.

RIPPLE

The sum of the peak ripple voltage and the DC voltage

should not exceed the rated voltage. Refer to graph fig. 1 for

permissible peak-to-peak ripple voltage as a percentage of

rated voltage for various frequencies.

Fig. 1

POWER FACTOR

The power factor is variable, and a function of temperature

and frequency. See fig 2. Nominal value < 0.5 % at 20 °C.

Fig. 2

DIELECTRIC RESISTANCE

(Parallel resistance) is indicated by the graph of insulance

(M

Ω x μF) vs temperature fig 3. The insulance (MΩ x μF) is

nominally 10 000 s at + 20 °C. (Measurements taken after

1 minute with an applied voltage of 500 V).

Fig. 3

LIFE EXPECTANCY

ER type capacitors are designed for a life exceptancy of

50 000 h at 65 °C. To achieve the same life expectancy

at 85 °C derate to 60 % of rated voltage fig 4.

Fig. 4

30

10

20

10

100

1000

FREQUENCY Hz

0

10 000

2 %

0 %

1 %

80

- 20

0

40

65

1 kHz

50 Hz

Power Factor

vs.

Temperature

at 20 °C

- 40

0

40

80

10

2

10

3

10

4

10

5

Insulance vs. Temperature

Typical Values

50

100

150 °C

10

2

10

3

10

4

10

5

Rated Voltage