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MIL-PRF-914 Resistor Networks, Fixed, Film, Surface Mount, Nonestablished Reliability, And Established Reliability, General Specification ForThis specification covers the general requirements for nonestablished reliability \(non-ER\) and established reliability \(ER\), hermetically sealed \(see 3.27\) and nonhermetically sealed networks \(see 3.27.1\). These networks consist entirely of fixed, film resistors. They are primarily intended for use in surface mount applications where space is a major concern. ER resistors covered by this specification will have life failure rates \(FR\) ranging from 1 percent to 0.001 percent per 1,000 hours \(see 1.2.1.7\). The ER FR are established at a minimum 60-percent confidence level on the basis of life tests. Designers are CAUTIONED on using these resistors in pulse applications \(see 6.4.4\).

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MIL-PRF-914C
TABLE VII. Metallization resistance.
Nominal element
Maximum metallization
resistance (ohms) R
resistance value (ohms) R
≤
1
1,000
R
1000 <
R
<
10,000
5
≥
10
R
10,000
3.5.6 Pure tin. The use of pure tin, as an underplate or final finish, is prohibited both internally and externally. Tin
content of resistor components and solder shall not exceed 97 percent, by mass. Tin shall be alloyed with a
minimum of 3 percent lead, by mass (see 6.4.2).
3.6 Power rating. The networks and individual resistors shall have a power rating based on continuous full-load
O
O
operation at an ambient temperature of 70 C. For temperatures other than 70 C, the power rating shall be in
accordance with figure 1.
70
125
110
100
80
60
40
20
0
0
20
40
60
80
100
120
140
160
180
200
AMBIENT TEMPERATURE IN OC
FIGURE 1. Derating curve for high-ambient temperatures.
NOTE: This curve indicates the percentage of nominal wattage to be applied at temperature higher than 70OC.
However, at no time shall the applied voltage exceed the maximum for each style (see 3.1).
3.7 Voltage rating. Each resistor element shall have a rated dc continuous working voltage or an approximate
sine-wave root-mean-square (rms) continuous working voltage corresponding to the wattage (power) rating, as
determined from the following formula:
E = PR
Where:
E = Continuous rated dc or rms working voltage in volts.
P = Rated wattage in watts.
R = Nominal resistance in ohms.
In no case shall the rated voltage be greater than the applicable maximum voltage (see 3.1).
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