MIL-PRF-39017 Resistors, Fixed, Film \(Insulated\), Nonestablished Reliability, And Established Reliability, General Specification ForThis specification covers the general requirements for nonestablished reliability \(non-ER\) and established reliability \(ER\), insulated, film, fixed resistors. These resistors are capable of full load operation at an ambient temperature of 70 Degrees C and have a resistance temperature characteristic of 100 parts per million \(PPM\) and 350 PPM per degree Celsius \(PPM/Degrees C\). The ER resistors have life failure rate \(FR\) levels ranging from 1.0 percent to 0.001 percent per 1,000 hours \(see 1.2.1.4\). These FR levels are established at a 60 percent confidence level on the basis of life tests. Designers are CAUTIONED on using these resistors in high power pulse applications \(see 6.13.2\).

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MIL-PRF-39017G

3.6 Power rating. The resistors shall have a power rating as specified (see 3.1), based on continuous

full-load operation at the ambient temperature of 70�C. This power rating is dependent on the ability of

resistors to meet the life requirements specified in 3.24 (see 6.6). For temperatures in excess of those

specified above, the load shall be derated as shown on figure 2

FIGURE 2. Derating curve for high ambient temperatures.

3.7 Voltage rating. Resistors shall have a rated direct current (dc) continuous working voltage or an

approximate sine-wave root-mean-square (rms) alternating current (ac) continuous working voltage at

commercial-line frequency and waveform corresponding to the power rating, as determined from the

following formula:

(PR)

Where:

E = Continuous rated dc or rms ac working voltage in volts.

P = Power rating (see 3.1).

R = Nominal resistance (see 3.1).

In no case shall the rated dc or rms ac continuous working voltage be greater than the applicable

maximum value (see 3.1).