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Modifications
The following additional change items shall apply to this DCR1243 as detailed in the revised DCR attachment 3501 Draft 5D.
Note: the stated Rakon justification for each change is also provided in each item.
29) Para. 9.3, Shock: The peak acceleration and duration of the pulse during Qualification & MoQ testing (New Chart F4) for specific package styles is added to be:
: 1000g for packages similar to style TO-5 (i.e. 3501/018)
: 500g for packages similar to style TO-8 (i.e. 3501/019)
(Rakon justification: Increase of mechanical shock level to be closer to customer need and to MIL-PRF-3098 level)
30) Para. 7.1.1 (ref. new Para 8.3.2.1), Burn-in duration: changed to be 720h minimum for crystals for OCXO applications (was 240h)
(Rakon justification: to allow for an extrapolation of aging).
31) Para. 9.4, Vibration: The vibration amplitude is changed to be 40g (3mm or 400/ms2) (was 20g; 1.5mm to 200m/s2))
(Rakon justification: Increase of sine vibration level to be closer to customer need)
32) Para. 9.15, Rapid Change of Temperature: Number of cycles is changed to 50 (was 10)
(Rakon justification: Increase of number of rapid change to be closer to customer need)
33) Para. 9.17, Life Test (specifically for OCXO applications) (ref. new Para 8.11.1): Only final measurements apply at 1000h or 2000h, as applicable (i.e. the 500h & 1000h intermediate measurements are deleted).
For the daily measurements of Resonance Frequency, only a minimum of 4 measurements per week need be recorded.
(Rakon justification: Drift calculation is limited to full test (0 / 1000h or 2000h) because resistance cannot be measured without removing quartz crystal from oscillator and resonance frequency drift necessary to achieve frequency aging of such crystal is below the 3 ppm with a lot of margin)
34) Para 9.13, Solderability: For gold plated terminals the test is split in to 2 steps: Degolding & Tinning
(Rakon justification: Clarification of test for gold plated terminals)
35) new Chart F4 (see also point 3)): The sampling for the various test subgroups is reduced when Periodic testing for extension of qualification is being performed; see attached for details.
(Rakon justification: RAKON requests to limit quantity to be tested for maintenance of qualification (periodic testing). The increase of quantity to 41 components (in draft 5B) versus 16 components in issue 4 is very high versus quartz crystal business (batch size some tens and quantity produced by year)).
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