Cylindrical Types, High-Voltage Mica Capacitors

CDM Cornell Dubilier

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

Capacitance is within tolerance

when measured at these frequen-

cies:

1–1000 pF @ 1 MHz

> 1000 pF @ 1 kHz

Dissipation Factor is typically less

than 0.05% when measured as

above. Dissipation factor (DF) equals

2

πfRC, where f is the test frequency,

R is the equivalent series resistance

(Ω), and C is nominal capacitance

(F). Q is the reciprocal of the dissipa-

tion factor.

Operating Temperature Range is

–55 °C to +125 °C. Insulation Resis-

tance is no less than 7500

MΩ when

measured at 100 Vdc.

Temperature Coefficient and Ca-

pacitance Drift: Measure the capac-

itors’ capacitance at 25 °C, 55 °C, 25

°C, 125 °C, and at 25 °C after stabi-

lizing at each temperature. The ca-

pacitance will meet the limits of the

Characteristic table shown in Order-

ing Information.

Rated Peak Voltage is not to be ex-

ceeded in actual use. Voltage ratings

are in the listings and apply under

the following conditions:

Temperature: Within the specified

operating temperature range.

Altitude: Up to 50,000 feet or

3.4 inches of mercury.

Relative Humidity: Up to 80%.

Frequency: As specified.

Where pulse conditions are en-

countered, contact us.

Withstanding Voltage: Capacitors

will withstand application of an ac

potential between terminals hav-

ing an rms value equal to the rated

peak voltage at a frequency of 100

Hz or less without damage, arcing or

breakdown. Apply the potential by

raising the voltage from zero to the

specified value. Apply the full po-

tential for a minimum of 5 seconds.

Case Insulation: Capacitor cases

will withstand, without damage, arc-

ing or breakdown, a 60-Hz peak ac

potential equal to twice the rated

peak voltage applied between the

terminals connected together and

a metal electrode touching the case.

Apply this potential for 1to 5 sec-

onds.

Current Ratings at various

fre-quencies are in the listings and

ap-ply under the following condi-

tions:

Temperature: 65 °C maximum

Derating Factor: None

Vibration:

Capacitors will with-

stand vibrational forces occurring

at rates of from 10 to 55 Hz for 4½

hours. The total excursion during vi-

bration is 0.06 inches. At the end of

this period, make the following in-

spections and tests:

Visual and Mechanical Inspection:

No perceptible deterioration. With-

standing Voltage: As specified under

Withstanding Voltage.

Insulation Resistance: No less than

7500 M

Ω.

Capacitance Change: Not to exceed

3% of the nominal value or one pico-

farad, whichever is greater.

Temperature and Immersion Cy-

cling: Capacitors will withstand the

temperature and immersion cycles

indicated in the tables below. Fol-

low three temperature cycles by two

immersion cycles. Make the mea-

surements listed below no more

than 30 minutes following the final

immersion cycle:

Withstanding Voltage: As specified

under Withstanding Voltage.

Insulation Resistance: No less than

7500 M

Ω.

Capacitance: Change not to exceed

4% of the nominal value or one pico-

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-

fied under Withstanding Voltage.

Insulation Resistance: No less than

7500 M

Ω.

Capacitance Change: Within the

limits given in the table below or

one picofarad, whichever is great-

er.

Characteristic Maximum Cap.

B

±8%

In addition, the capacitor must

show no visual damage and the

markings must be legible.

Specifications