scope:

This specification covers the general requirements for established reliability, mica dielectric, fixed capacitors (see 6.1). Capacitors covered by this specification have a failure rate level ranging from 1.0 percent per 1,000 hours to 0.001 percent per 1,000 hours (see 1.2.1.7). The failure rate level is established at a 90 percent confidence Level. The failure rate Level, identified by the applicable symbol specified in table V, is referred to operational Life at full rated voltage (see 1.2.1.6) at 125°C or 150°C, as applicable. An acceleration factor of 25:1 has been used to relate Life test data obtained at 150 percent of rated voltage at rated temperature to rated voltage at rated temperature.

The term Part or Identifying Number (PIN) is equivalent to the term (part number, identification number, type designator, etc.) which was previously used in this specification. A part per million (PPM) quality system is used for documenting and reporting the average outgoing quality of capacitors supplied to this specification. Statistical process control (SPC) techniques are required in the manufacturing process to minimize variation in production of capacitors supplied to the requirements of this specification.

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

The style is identified by the three-letter symbol "CMR" followed by a two-digit number; the letters identify mica dielectric, fixed capacitors, established reliability, and the number identifies the shape and dimensions of the capacitor.

The characteristic is identified by a single letter which indicates the relative stability of the capacitor with temperature change, in accordance with table I. Beneficial comments (recommendations, additions, deletions) and any pertinent data which may be of use in improving this document should be addressed to: Commander, U.S. Army Laboratory Command (LABCOM), ATTN: SLCET-R-S, Fort Monmouth, NJ 07703-5302, by using the Standardization Document Improvement Proposal (DD Form 1426) appearing at the end of this document or by letter. TABLE I. Characteristic.

Symbol Temperature coefficient Capacitance drift -------------------------------------------------------------- Parts/million/°C C −200 to +200 ±(0.5 percent +0.1 pF) E −20 to +100 ±(0.1 percent +0.1 pF) F 0 to +70 ±(0.05 percent +0.1 pF)

The nominal capacitance value expressed in microfarads (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. When the nominal value is less than 10 pF, the letter R shall be used to indicate the decimal point and the succeeding digit(s) of the group shall represent significant figure(s). For example 1RO indicates 1.0 pF; R75 indicates 0.75 pF; and OR5 indicates 0.5 pF.

The capacitance tolerance in percent or pF, as applicable, is identified by a single letter in accordance with table II. TABLE II. Capacitance tolerance.

Symbol Capacitance tolerance --------------------------------- (± ) D 0.5 pF F 1 percent G 2 percent J 5 percent

The operating temperature range is identified by a single letter in accordance with table III. TABLE III. Operating temperature range.

Symbol Operating temperature range -------------------------------------- °C O −55 to +125 P −55 to +150

The rated voltage is identified by a single letter in accordance with table IV. TABLE IV. Rated voltage.

Symbol DC rated voltage ----------------------------- A 100 C 300 D 500 Y 50

The failure rate level in percent per 1,000 hours is identified by a single letter in accordance with table V, and is based on rated voltage at 125°C or 150°C, as applicable. TABLE V. Failure rate level.

Symbol Failure rate level (percent per 1,000 hours) ------------------------------------ M 1.0 P 0.1 R 0.01 S 0.001

intended Use:

The capacitors covered by this specification are intended for use in equipment where a known order of reliability is required.