scope:

This specification covers the general requirements for established reliability (ER) and non-ER capacitors designed for operation with alternating current (ac) and direct current (dc), paper, metallized paper, and metallized plastic dielectric, radio-interference-reduction, feed-through capacitors, hermetically sealed in metal cases (see 6.6.1), for use primarily in broad-band, radio-interference suppression application. Capacitors meeting the established reliability requirements specified herein have a maximum failure rate of 1%/1000 hours. This failure rate is established with a 90% confidence limit based on the life test parameters specified and are maintained at a 10-percent producer's risk. An acceleration factor of 5:1 has been used to relate the life test data obtained at 140 percent of rated voltage (ac or dc) at the applicable high test temperature to the rated voltage at the applicable high test temperature. Styles CZ20, CZ25, CZ32, and CZ33 contained herein, of which are of a metallized construction and should be used only in circuitry in which high values of insulation resistance are not essential, and in which occasional momentary breakdowns can be tolerated (see 6.6.2).

The type designation shall be in the following form, and as specified (see 3.1 and 6.1).

The style is identified by either the three-letter symbol "CZR" or the two-letter symbol "CZ" followed by a two-digit number. The letters identify ac and dc, radio-interference reduction feed through capacitors, hermetically sealed in metal cases. The symbol "CZR" identifies established reliability (ER) capacitors; the symbol "CZ" identifies capacitors for which no specific reliability requirements are specified (non-ER). The first digit following the letter symbols identifies the general shape of the case, and the second digit identifies specific details other than case size. Each style designation may include a family of case sizes.

The current rating is identified by a single letter in accordance with table I. TABLE I. Current rating.

Symbol Current rating in amperes (dc or ac-rms) -------------------------------------------------------- A - - - - - - - - - - - - - - - 5 B - - - - - - - - - - - - - - - 10 D - - - - - - - - - - - - - - - 20 F - - - - - - - - - - - - - - - 50 H - - - - - - - - - - - - - - - 100 K - - - - - - - - - - - - - - - 300

The characteristic is identified by a single letter in accordance with table II. TABLE II. Characteristic.

Values for characteristics P K E W ------------------------------------------------------------------------------------------------------ High ambient test temperature, degrees centigrade 3C - - - - - - - - - - 150 125 85 85 Low ambient test temperature, degrees centigrade 3C - - - - - - - - - - −55 −55 −55 −55 Life-test voltage (see 4.7.24), in percent of rated ac or dc voltage rating - 140 140 140 140 Capacitance tolerance (percent) - - - - - - - - - - - - - - - - - - - - - - - - −10+30 ±10 ±10 ±20 ≥0.25μF −10+50 ≤0.25μF

The voltage rating is identified by a single letter in accordance with table III. TABLE III. Voltage rating.

Voltage rating Symbol Volts, dc Volts, ac 1/ --------------------------------------------------------------- B - - - - - - - - - - - - - - - 100 - - - C - - - - - - - - - - - - - - - 200 - - - E - - - - - - - - - - - - - - - 400 - - - F - - - - - - - - - - - - - - - 600 - - - J - - - - - - - - - - - - - - - 1,200 - - - U - - - - - - - - - - - - - - - - - - 250 1/ Rated frequency of operation for ac capacitors shall be as specified (see 3.1).

The nominal capacitance value expressed in picofarad (pF) is identified by a three-digit number; the first two digits represent significant figures and the last digit specifies the number of zeros to follow.

The failure rate level of 1.0 percent per 1,000 hours is identified by a symbol M, and is based on operation at rated working voltage and maximum rated temperature.