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29280B302JO0

Cylindrical Types, High-Voltage Mica Capacitors

Cornell Dubilier Electronics 

Cylindrical Types, High-Voltage Mica Capacitors

Specifcations

Capacitance is within tolerance Case Insulation: Capacitor cases

when measured at these frequen- will withstand, without damage, arc-

cies:

ing or breakdown, a 60-Hz peak ac

1–1000 pF @ 1 MHz

potential equal to twice the rated

> 1000 pF @ 1 kHz

peak voltage applied between the

Dissipation Factor is typically less terminals connected together and

than 0.05% when measured as a metal electrode touching the case.

above. Dissipation factor (DF) equals Apply this potential for 1to 5 sec-

2πfRC, where f is the test frequency, onds.

R is the equivalent series resistance Current Ratings at various

(Ω), and C is nominal capacitance fre-quencies are in the listings and

(F). Q is the reciprocal of the dissipa- ap-ply under the following condi-

tion factor.

tions:

Operating Temperature Range is Temperature: 65 °C maximum

–55 °C to +125 °C. Insulation Resis- Derating Factor: None

tance is no less than 7500 MΩ when Vibration: Capacitors will with-

measured at 100 Vdc.

stand vibrational forces occurring

Temperature Coefcient and Ca- at rates of from 10 to 55 Hz for 4½

pacitance Drift: Measure the capac- hours. The total excursion during vi-

itors’ capacitance at 25 °C, 55 °C, 25 bration is 0.06 inches. At the end of

°C, 125 °C, and at 25 °C after stabi- this period, make the following in-

lizing at each temperature. The ca- spections and tests:

pacitance will meet the limits of the Visual and Mechanical Inspection:

Characteristic table shown in Order- No perceptible deterioration. With-

ing Information.

standing Voltage: As specifed under

Rated Peak Voltage is not to be ex- Withstanding Voltage.

ceeded in actual use. Voltage ratings Insulation Resistance: No less than

are in the listings and apply under 7500 MΩ.

the following conditions:

Capacitance Change: Not to exceed

Temperature: Within the specifed 3% of the nominal value or one pico-

operating temperature range. farad, whichever is greater.

Altitude: Up to 50,000 feet or

Temperature and Immersion Cy-

3.4 inches of mercury.

cling: Capacitors will withstand the

Relative Humidity: Up to 80%. temperature and immersion cycles

Frequency: As specifed.

indicated in the tables below. Fol-

Where pulse conditions are en- low three temperature cycles by two

countered, contact us.

immersion cycles. Make the mea-

Withstanding Voltage: Capacitors surements listed below no more

will withstand application of an ac than 30 minutes following the fnal

potential between terminals hav- immersion cycle:

ing an rms value equal to the rated Withstanding Voltage: As specifed

peak voltage at a frequency of 100 under Withstanding Voltage.

Hz or less without damage, arcing or Insulation Resistance: No less than

breakdown. Apply the potential by 7500 MΩ.

raising the voltage from zero to the Capacitance: Change not to exceed

specifed value. Apply the full po- 4% of the nominal value or one pico-

tential for a minimum of 5 seconds. farad, whichever is greater.

Temperature Cycling Test Con-

ditions

Steps Temp Interval

(°C) (Minutes)

1

–55 + 0 30

–3

2

25 +10 10 to 15

–5

3

125 + 3 30

–0

4

25 +10 10 to 15

–5

Immersion Test Conditions

•Number of cycles: 2

•Duration of each immersion: 15

minutes

•Immersion bath: Saturated solu-

tion of sodium chloride and water

•Temp. of hot bath: 65 –0 +5 ºC

•Temp. of cold bath: 25 –0 +10 ºC

Life Test: Subject all capacitors

to a temperature of 55 °C for 48

hours. Then subject units cast in

rectangular cases (Types 271, 272,

and 273) to a 60-Hz rms voltage

equal to the rated peak voltage

for 250 hours. Subject units cast in

cylindrical cases (Types 291, 292,

293, and 294) to a 60-Hz rms volt-

age equal to 90% of the rated peak

voltage for 250 hours. In both

tests, maintain the temperature

at 125 °C. After test, the capacitors

will meet these requirements:

Withstanding Voltage: As speci-

fed under Withstanding Voltage.

Insulation Resistance: No less than

7500 MΩ.

Capacitance Change: Within the

limits given in the table below or

one picofarad, whichever is great-

er.

Characteristic Maximum Cap.

B

±8%

C

±3%

D

±3%

E

±3%

In addition, the capacitor must

show no visual damage and the

markings must be legible

CDM Cornell Dubilier • 140 Technology Place • Liberty, SC 29657 • Phone: (864)843-2277 • Fax: (864)843-3800 • www.cde.com

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