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MIL-PRF-39009 Resistors, Fixed, Wire-Wound \(Power Type, Chassis Mounted\), Nonestablished Reliability, Established Reliability, General SpecificationThis specification covers the general requirements for nonestablished reliability \(non-ER\), and established reliability \(ER\), power type, wire wound, fixed resistors which utilize the principal of heat dissipation through a metal mounting surface. These resistors have initial resistance tolerances of ??1 percent. These resistors are suitable for continuous full load operation at an ambient temperature of +25 degrees C, and when derated up to +250 degrees C \(see figure 1\). These resistors should not be used in circuits where their ac performance is of critical importance in the operation of such circuits. However, provisions have been made in particular styles to minimize inductances \(see 3.1\). These resistors will have life failure rate levels \(FRL\) ranging from 1.0 percent to 0.001 percent per 1,000 hours \(see 1.2.1.4\). These FRL are established at a 60 percent confidence on the basis of the life tests. The FRL, identified by the appropriate symbol, is referred to operation at full rated wattage at +25 degrees C, with a permissible change in resistance of ??2 percent as the criteria for failure.

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MIL-PRF-39009E
1.2.1.1 Style. The style is to be identified by the three letter symbol "RER" followed by a two digit
number; the letters identify ER, chassis mounted, power type, wire wound, fixed resistors, and the number
identifies the sizes, and power rating of the resistors.
1.2.1.2 Resistance tolerance. The resistance tolerance is identified by a single letter in accordance with
table I.
TABLE I. Resistance tolerance.
Symbol
Resistance tolerance
percent (±)
F
1.0
1.2.1.3 Resistance. The nominal resistance is expressed in ohms and is identified by four digits; the
first three digits represent significant figures and the last digit specifies the number of zeros to follow.
When fractional values of an ohm, and values of less than 100 ohms are required, the letter "R" is
substituted for one of the significant digits to represent the decimal point. When the letter "R" is used,
succeeding digits become significant. The following are examples of symbols for resistance values:
R100
=
0.10 ohm
1R00
=
1.0 ohm
10R0
=
10.0 ohms
1000
=
100 ohms
1001
=  1,000 ohms
1002
= 10,000 ohms
Minimum and maximum resistance values are as specified (see 3.1). The standard resistance values for
every decade follows the sequence demonstrated for 10 decade to 100 decade as specified in table II.
TABLE II. Standard resistance values for the 10 to 100 decade. 1/
F (1.0)
10.00
14.70
21.50
31.60
46.40
68.10
10.20
15.00
22.10
32.40
47.50
69.80
10.50
15.40
22.60
33.20
48.70
71.50
10.70
15.80
23.20
34.00
49.90
73.20
11.00
16.20
23.70
34.80
51.10
75.00
11.30
16.50
24.30
35.70
52.30
76.80
11.50
16.90
24.90
36.50
53.60
78.70
11.80
17.40
25.50
37.40
80.60
54.90
12.10
17.80
26.10
38.30
82.50
56.20
12.40
18.20
26.70
39.20
84.50
57.60
12.70
18.70
27.40
40.20
86.60
59.00
13.00
19.10
28.00
41.20
88.70
60.40
13.30
19.60
28.70
42.20
90.90
61.90
13.70
20.00
29.40
43.20
93.10
63.40
14.00
20.50
30.10
44.20
95.30
64.90
14.30
21.00
30.90
45.30
97.60
66.50
1/ Resistors having resistance values not listed herein, or in any
other decade, are considered as not conforming to the
specification.
2



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