MIL-PRF-19500/626A
3.5 Marking. Devices shall be marked as specified in MIL-PRF-19500.
3.5.1 Marking for the -US devices. For -US devices only, all marking may be omitted from the device except for the cathode marking.
All marking which is omitted from the body of the device shall appear on the label of the initial container.
4. QUALITY ASSURANCE PROVISIONS
4.1 Classification of inspections. The inspection requirements specified herein are classified as follows:
a.
Qualification inspection (see 4.2).
b.
Screening (see 4.3)
c.
Conformance inspection (see 4.4).
4.2 Qualification inspection. Qualification inspection shall be in accordance with MIL-PRF-19500.
4.3 Screening (JANS, JANTX and JANTXV levels only). Screening shall be in accordance with MIL-PRF-19500 (Appendix E, table
IV), and as specified herein. The following measurements shall be made in accordance with table I herein. Devices that exceed the limits
of table I herein shall not be acceptable.
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Screen (see
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Measurement
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appendix E,
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table IV of
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MIL-PRF-19500)
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JANS level
| JANTX and JANTXV levels
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3c 1/
| Thermal impedance (see 4.3.2)
| Thermal impedance (see 4.3.2)
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9
| Not applicable
| Not applicable
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10
| Not applicable
| Not applicable
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11
| VF1 and IR1
| VF1 and IR1
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12
| MIL-STD-750, method 1038;
| MIL-STD-750, method 1038;
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| test condition A; t = 240 hours;
| test condition A; t = 48 hours;
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| VR = 80 percent of rated VR;
| VR = 80 percent of rated VR;
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| TA = +125°C.
| TA = +125°C.
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13
| Subgroup 2 of table I herein;
| Subgroup 2 of table I herein;
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| VF1 and IR1; ĆVF1 = ± 100 mV (pk);
| VF1 and IR1; ĆVF1 = ± 100 mV (pk);
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| ĆIR1 = ± 5 µA dc or 100 percent from
| ĆIR1 = ± 5 µA dc or 100 percent from
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| the initial value, whichever is greater.
| the initial value, whichever is greater.
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1/ Thermal impedance shall be performed any time after screen 3.
4.3.1 Burn-in conditions. Burn-in conditions are as follows: TA = +125°C; VR = 0.8 to 0.85 rated VR dc (see 1.3).
4.4 Quality conformance inspection. Quality conformance inspection shall be in accordance with MIL-PRF-19500.
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