ER
Vishay ESTA
DC Filter Capacitors
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.
30
20
%
P
E
10
0
TYPE ER
10
100
Fig. 1
1000
10 000
FREQUENCY Hz
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.
POWER FACTOR
The power factor is variable, and a function of temperature
and frequency. See fig 2. Nominal value < 0.5 % at 20 °C.
at 20 °C
Power Factor
vs.
Note
Temperature
2 %
•
The impregnant used is a non toxic highly refined, purified and
inhibited mineral oil.
1 kHz
1 %
50 Hz
APPLICATIONS
The ER range of capacitors are specifically designed for DC
applications.
0 %
65 80
- 20
0
40
Fig. 2
DIELECTRIC RESISTANCE
• Audio coupling
(Parallel resistance) is indicated by the graph of insulance
(MΩ 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).
• Pulse forming networks
• Oscillator circuits
• Arc and spark suppression
• RF by-pass
105
• Tuned filters
104
• Energy storage
• Integrating circuits
• Low and high pass filters
• High voltage smoothing
103
Insulance vs. Temperature
Typical Values
102
- 40
0
40
80
Fig. 3
Capacitors required for AC applications and high discharge
rates can also be designed from the ER range.
LIFE EXPECTANCY
Consult Vishay Electronic GmbH, Division Roederstein
ESTA and Hybrids for your specific requirements.
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.
TEMPERATURE RANGE
Temperature range is - 55 °C to + 85 °C. The nominal
voltage rating is applicable from - 55 °C to + 85 °C.
105
104
103
Derating is required for higher operating temperatures.
TEMPERATURE COEFFICIENT
Capacitance will increase by 2 % per 100 °C temperature
change.
102
50
150 °C
Rated Voltage
100
Fig. 4
Document Number: 13013
Revision: 11-Aug-10
For technical questions, contact: esta@vishay.com
www.vishay.com
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