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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

3.8 Thermal shock. When networks are tested as specified in 4.8.3, there shall be no evidence of mechanical

damage. The change in resistance between initial and final measurements for the combined thermal shock and

power conditioning test (see 3.9), group A inspection shall not exceed the values specified:

Delta R

Resistance ratio

Characteristic

K and M

�(0.70 percent +0.01 ohm)

�(0.50 percent +0.01 ohm)

C, R, and V

�(0.25 percent +0.01 ohm)

�0.03 percent

The change in resistance between initial and final measurements for the thermal shock test of qualification inspection

group V, and group C inspection, networks shall not exceed the values specified:

Characteristic

Delta R

Resistance ratio

K and M

�(0.50 percent +0.01 ohm)

�(0.25 percent +0.01 ohm)

C, R, and V

�(0.15 percent +0.01 ohm)

�0.03 percent

3.9 Power conditioning. When networks are tested as specified in 4.8.4, there shall be no mechanical damage.

The change in resistance between initial and final measurements for the combined power conditioning and thermal

shock test (see 3.8), networks shall not exceed the values specified:

Characteristic

Delta R

Resistance ratio

K and M

�(0.70 percent +0.01 ohm)

�(0.50 percent +0.01 ohm)

C, R, and V

�(0.25 percent +0.01 ohm)

�0.03 percent

3.10 DC resistance.

3.10.1 Individual resistance. When networks are tested as specified in 4.8.5, the dc resistance shall be within the

specified tolerance of the nominal resistance (see 1.2.1.3) and shall be stable within the specified tolerance during

the measurement.

3.10.2 Resistance between isolated pins. The resistance between any two isolated resistors tested as specified in

4.8.5 shall be not less than 5 megohms. This shall only be measured during the final resistance test of group A

inspection.

3.10.3 Resistance ratio accuracy (applicable to characteristics C, R, and V). When networks are tested as

specified in 4.8.5, the resistance ratio accuracy shall be as specified in table VIII.

TABLE VIII. Resistance ratio accuracy.

Resistance

Resistance ratio

Characteristics

tolerance

accuracy (percent)

0.1

C, R or V

0.1

0.5

3.11 Solderability. When networks are tested as specified in 4.8.6, there shall be no evidence of mechanical

damage.