550D

Vishay Sprague

for High Frequency Power Supplies

www.vishay.com

For technical questions, contact: aluminumcaps4@vishay.com

Document Number: 40017

5

Revision: 28-Aug-08

PERFORMANCE CHARACTERISTICS

• Operating Temperature: Capacitors are designed to

operate over the temperature range of

- 55 °C to + 85 °C with no derating.

• Capacitors may be operated up to + 125 °C with voltage

derating to two-thirds the + 85 °C rating.

2.

DC Working Voltage: The DC working voltage is the

maximum operating voltage for continuous duty at the

rated temperature.

3.

Surge Voltage: The surge DC rating is the maximum

voltage to which the capacitors may be subjected

under any conditions, including transients and peak

ripple at the highest line voltage.

3.1

Surge Voltage Test: Capacitors shall withstand the

surge voltage applied in series with a 33

Ω ± 5 %

resistor at the rate of 1.5 min on, 1.5 min off at

+ 85 °C, for 1000 successive test cycles.

3.2

Following the surge voltage test, the dissipation factor

and the leakage current shall meet the initial

requirements;

the

capacitance

shall

not

have

changed more than ± 10 %.

4.

Capacitance Tolerance: The capacitance of all

capacitors shall be within the specified tolerance

limits of the nominal rating.

4.1

Capacitance measurements shall be made by means

of polarized capacitance bridge. The polarizing

voltage shall be of such magnitude that there shall be

no reversal of polarity due to the AC component. The

maximum voltage applied to capacitors during

+ 25 °C. If the AC voltage applied is less than one-half

volt rms, no DC bias is required. Measurement

accuracy of the bridge shall be within ± 2 %.

5.

Capacitance Change With Temperature: The

capacitance change with temperature shall not

exceed the following percentage of the capacitance

measured at + 25 %

6.

Dissipation

Factor:

The

dissipation

factor,

determined from the expression 2

π f C

exceed values listed in the Standard Ratings Table.

6.1

Measurements shall be made by the bridge method

at, or referred to, a frequency of 1000 Hz and a

temperature of + 25 °C.

7.

Leakage Current: Capacitors shall be stabilized at

the rated temperature for 30 min. Rated voltage shall

be applied to capacitors for 5 min using a steady

source of power (such as a regulated power supply)

with 1000

Ω resistor connected in series with the

capacitor under test to limit the charging current.

Leakage current shall then be measured.

Note that the leakage current varies with temperature and

applied voltage. See graph below for the appropriate

adjustment factor.

+ 85 °C RATING

+ 125 °C RATING

Working

Voltage

(V)

Surge

Voltage

(V)

Working

Voltage

(V)

Surge

Voltage

(V)

68

45

10

13

7

9

15

20

10

12

20

26

13

16

35

46

23

28

50

65

33

40

- 55 °C

+ 85 °C

+ 125 °C

- 10 %

+ 8 %

+ 12 %

TYPICAL LEAKAGE CURRENT FACTOR

RANGE AT + 25 °C

1.0

0.8

0.7

0.6

0.5

0.4

0.3

0.2

0.1

0.08

0.07

0.06

0.05

0.04

0.03

0.02

0.01

0.008

0.007

0.006

0.005

0.004

0.003

0.002

0.001

0

PERCENT OF RATED VOLTAGE

10

30

20

90

40

50

60

70 80

100