Document Number: 40017

Revision 11-Nov-04

www.vishay.com

28

550D

Vishay Sprague

For technical questions, contact tantalum@vishay.com

PERFORMANCE CHARACTERISTICS

1.

Operating Temperature: Capacitors are designed

to operate over the temperature range of - 55°C to

+85°C with no derating.

1.1

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 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 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

measurement shall be 2 volts rms at 1000Hz at + 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 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 1000Hz 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 applied voltage. See graph

below for the appropriate adjustment factor.

7.1

At + 25

value listed in the Standard Ratings Table.

7.2

At + 85

times the value listed in the Standard Ratings Table.

7.3

At + 125

times the value listed in the Standard Ratings Table.

8.

Life Test: Capacitors shall withstand rated DC voltage

applied at + 85°C for 2000 hours or rated DC voltage

applied at + 125°C for 1000 hours.

8.1

Following the life test, the dissipation factor shall meet

the initial requirement; the capacitance change shall

not exceed ± 2%; the leakage current shall not exceed

125% of the original requirement.

- 55°C

- 10%

+ 85°C

+ 8%

+ 125°C

+ 12%

WORKING

SURGE

WORKING

SURGE

VOLTAGE

VOLTAGE

VOLTAGE

VOLTAGE

(V)

(V)

(V)

(V)

68

4

5

10

13

7

9

15

20

10

12

20

26

13

16

35

46

23

28

50

65

33

40

+ 85

+ 125

TYPICAL LEAKAGE CURRENT FACTOR RANGE

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

At

+ 25