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U787D Series

U787D Specifications - Large Tubulars

Item

Category Temperature Range

55 to 150 C

Rated Voltage Range

6.3 to 80VDC

Capacitance Range

180 to 47,000 F at

25 C, 120Hz

Capacitance Tolerance

20% ( M ) at

25 C, 120Hz

Vibration Rating

10 -1,000Hz, 20g, sinusoidal

(10 - 2,000Hz, 40g, sinusoidal available upon request)

Endurance

(Load Life)

The following specifications shall be satisfied when the capacitors are restored to

25 C

after subjecting them to the DC rated voltage for 2,000 hours at

150 C with the rated ripple

current applied. The sum of the DC voltage and peak AC voltage must not exceed the full

rated voltage of the capacitors.

Capacitance change:

≤ 15% from initial measurement

ESR change

:

≤ 200% of initial specified limit

Impedance change :

≤ 200% of initial specified limit

Leakage current

:

≤ initial specified limit

Shelf Life

The following specifications shall be satisfied when the capacitors are restored to

25 C after

exposing them for 1,000 hours at

150 C without voltage applied. The rated voltage shall be

applied to the capacitors for a minimum of 30 minutes, at least 24 hours and not more than

48 hours before the measurements.

Capacitance change:

≤ 10% from initial measurement

ESR change

:

≤ 150% of initial specified limit

Leakage current

:

≤ initial specified limit

Characteristics

Leakage Current

Rated Ripple Current Multipliers

Ambient Temperature ( C)

Frequency (Hz )

I

K CV : K = 0.5 at

25 C, 6.5 at 150 C after 5 minutes.

Where I = Max. leakage current ( A ), C = Nominal capacitance ( F ) and V = Rated voltage ( V )

150 C

0.45

125 C

1.00

105 C

1.25

85 C

1.50

20k -100kHz

1.00

1kHz

0.82

300Hz

0.75

Engineering Bulletin Mar 07