scope:

This specification covers the general requirements for established reliability (ER) and non-established reliability (non-ER), mica dielectric, fixed capacitors (see 6.1). The ER capacitors have a failure rate level (FRL) ranging from 1.0 percent per 1,000 hours to 0.001 percent per 1,000 hours (see 1.2.1.7). The FRL is established at a 90 percent confidence level. The FRL, 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 the life test at 150 percent of rated voltage at rated temperature to rated voltage at rated temperature."

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, ER and non-ER, and the number identifies the shape and dimensions of the capacitor. Beneficial comments (recommendations, additions, deletions) and any pertinent data which may be of use in improving this document should be addressed to: US Army Communications-Electronics Command and Fort Monmouth, ATTN: AMSEL-LC-LEO-E-EP, Fort Monmouth, NJ 07703-5023, by using the Standardization Document Improvement Proposal (DD Form 1426) appearing at the end of the document or by letter.

The characteristic is identified by a single letter which indicates the relative stability of the capacitor with temperature change in accordance with table I. TABLE I. Characteristic.

Symbol Temperature coefficient Capacitance drift ------------------------------------------------------------------------------------- Parts/million/°C (ppm/°C) C −200 to +200 ± (0.5 percent +.01 picofarad (pF)) E −20 to +100 ± (0.1 percent +.01 pF) F −0 to +70 ± (0.05 percent +.01 pF)

The nominal capacitance value expressed in 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 1R0 indicates 1.0 pF; R75 indicates 0.75 pF; and 0R5 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 drift ------------------------------------------- (±) D .05 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 FRL 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. Product level designator.

Symbol Product level designator -------------------------------------- C ---- M 1.0 1/ P 0.1 1/ R 0.01 1/ S 0.001 1/ 1/ FRL (percent per 1,000 hours).

intended Use:

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