
AXTAL: “Space-COTS Crystals” (SCC)
- Posted by Manuel Padial Pérez
- On June 25, 2021
- 2
For New Space applications AXTAL offers as special service the sourcing and/or up-screening of commercial quartz crystal units with proven quality level to so-called “Space-COTS Crystals” (SCC) increasing the range of available package styles
Sourcing can be
- From “CROVEN CRYSTALS“ in Canada (the one who supplies the crystals used in the EPPL listed AXTAL OCXO AXIOM6060) with long Space heritage
- From a manufacturer with automotive certification (ISO16959)
- From a manufacturer with aerospace certification (ISO/AS9100)
- From a manufacturer with heritage for crystals for MIL applications, and with established statistical process control (SPC) and traceability
Up-Screening can be performed at different levels:
- Screening according to MIL-PRF-3098 Level “S” or Level “B”
- Screening to a relaxed level “X”, introduced and used by AXTAL for several space customers, see the following table
Screening (MIL-PRF3098K)
wdt_ID | Test Inspection | Level S | Level B | Level X* |
---|---|---|---|---|
1 | Pre-seal visual examination | 4.10.2.2 | 4.10.2.2 | 4.10.2.2 |
4 | PIND | 4.10.16 | N/A | N/A |
7 | Thermal frequency repeatability | 4.10.15, 10 cycles | N/A | N/A |
10 | Frequency and resistance | 4.10.6 (@ Tief) | 4.10.18 | 4.10.6 (@ Tief) |
13 | Unwanted Modes | 4.9.10 | N/A | 4.9.10 |
16 | Shunt capacitance | 4.10.7.1 | N/A | 4.10.7.1 |
19 | Motional capacitance | 4.10.7.2 | N/A | 4.10.7.2 |
22 | Quality factor | 4.10.8 | N/A | 4.10.8 |
25 | Aging | 4.10.27, 3, 30 days@85ºC, |Af/f| | N/A | N/A |
28 | Drive sensitivity (DLD) | 4.10.11 |Af/f| | N/A | 4.10.11 |Af/f| |
*AXTAL procedure
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Update:
Upscreening of quartz crystal units for Space can also be performed in accordance with ESCC3501, Level B or C, including tes of Charts I, II and III
Bernd Neubig
Managing Director
AXTAL GmbH & Co. KG
Dear Bernd Neubig
Thanks for your feedback, it is always a pleasure to have members of our doEEEt community, adding and giving value to what we do.
For any other information, you can contact us, and we will be happy to publish more information about it.
Regards.
doEEEt team