MIL-F-18327F
1.2.1.3 Class. The class is identified by a single letter in accordance with table II, denoting the maximum operating
temperature (see 6.4) for the realization of the life expectancy indicated in table III.
TABLE II. Class.
Symbol
Maximum operating
temperature °C
P
65
Q
85
R
105
S
125
V
Above 125
1.2.1.4 Life expectancy. The life expectancy is identified by a single letter in accordance with table III.
TABLE III. Life expectancy.
Symbol
Life (hours, minimum)
X
10,000
Y
2,500
1.2.1.5 Family. The family is identified by a two-digit symbol in accordance with table IV.
TABLE IV. Family.
Family
Application
11
Filter, low pass
12
Filter, low pass and band pass (combination)
13
Filter, low pass and high pass (combination)
22
Filter, band pass
24
Filter, band pass and band suppression (combination)
33
Filter, high pass
44
Filter, band suppression
1.2.1.6 Case and mounting dimensions. The case and mounting dimensions are designated by a two-letter
symbol in accordance with figures 1 to 6 inclusive.
1.2.1.6.1 Envelope and mounting dimensions for grades 5, 7, and 9 filters. Maximum envelope dimensions for
grades 5, 7, and 9 filters are specified on figure 1. Mounting dimensions are identical to the dimensions specified for
the equivalent cased-filter size.
1.2.1.7 Composition. The composition of the filter is identified by a single-digit symbol denoting the principal
resonators in accordance with table V.
TABLE V. Composition.
Symbol
Principal resonators
LC
1
Crystal
2
Other electromechanical
3
2
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