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593D

Vishay Sprague

Document Number 40005

Revision 01-Mar-04

32

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1.

Operating Temperature: Capacitors are designed to

operate over the temperature range - 55°C to + 85°C.

1.1

Capacitors may be operated 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 ohm

± 5% resistor at the rate of one-half minute on,

one-half minute 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 normal 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

measurement shall be 2 volts rms at 120 Hz at +25°C.

If the AC voltage applied is less than one-half volt rms,

no DC bias is required. Accuracy of the bridge shall

be within ± 2%.

6.

Dissipation Factor: The dissipation factor,

determined from the expression 2πfRC, shall not

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 120 Hz and a

temperature of + 25°C.

7.

Leakage Current: Capacitors shall be stabilized at

the rated temperature for 30 minutes. Rated voltage

shall be applied to capacitors for 5 minutes using a

steady source of power (such as a regulated power

supply) with 1000 ohm 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

+ 125

Working

Voltage

(V)

Working

Voltage

(V)

Surge

Voltage

(V)

Surge

Voltage

(V)

4

6.3

10

16

20

25

35

50

5.2

8

13

20

26

32

46

65

2.7

4

7

10

13

17

23

33

3.4

5

8

12

16

20

28

40

- 55°C

- 10%

+ 85°C

+ 10%

+ 125°C

+ 12%

PERFORMANCE CHARACTERISTICS

100

10

1.0

0.1

0.01

0.001

0

10

20

30

40

50

60

70

80

90

100

+ 125

+ 85

+ 55

+ 25

0

- 55

Percent of Rated Voltage

5.

Capacitance Change With Temperature: The

capacitance change with temperature shall not exceed

the following percentage of the capacitance measured

at + 25°C:

TYPICAL LEAKAGE CURRENT FACTOR RANGE