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

Material:

Flux: Type A or B, per J-STD-004

Solder: SN60A or SN63A, per J-STD-006

Wire: Soft Annealed Solid Copper

FIGURE 3. Adhesion test fixture.

4.8.13 Dielectric withstanding voltage (see 3.18).

4.8.13.1 Atmospheric pressure. Networks shall be tested in accordance with method 301 of MIL-STD-202. The

following details shall apply:

Mounting: For gullwing packages, the network shall be clamped by mounting with its top on a metal plate of

sufficient size to extend beyond the network extremities. An additional metal plate shall be mounted against

the bottom of the network, avoiding contact with the terminals. The terminals of the network shall be

connected together (see figure 4). For LCC packages, the network shall be clamped by mounting its

top/bottom on a metal plate of sufficient size to cover the nonterminated body surface; care should be taken

not to short out the terminations on both the top and bottom. The terminals of the network shall be

contacted together (see figure 5).

Magnitude of test voltage: 200 volts rms.

Nature of potential: An ac supply at commercial-line frequency (not more than 100 hertz (Hz)) and

waveform.

Duration of application of test voltage: 60 seconds +10 seconds, -0 seconds.

Points of application of test voltage: Between the terminals connected together and the metal-mounting

plates.

Inspections and measurements: During the tests, the leakage current shall be monitored and the networks

inspected for evidence of arcing and breakdown. At the conclusion of the test, networks shall be inspected

for evidence of damage.