USING COTS FOR ADVANCED SPACE EQUIPMENT

Transcription

1 USING COTS FOR ADVANCED SPACE EQUIPMENT 13 th 14 th October 2011 David Núñez Teruel Test 26/09/2011 1

2 BACKGROUND Required for higher performances, not available at space level yet. The use of COTS parts has inherent risks due to lack of confidence in hi-rel applications and new concerns (RoHS, counterfeit, etc.). A key factor is the identification of quality concerns considering the space environment and the reliability needs. Deep technological knowledge and manufacturer involvement is required to evaluate the risk. COTS can be a solution when space level parts are not feasible for our application ENHANCES THE NEEDS OF A SPECIFIC APPROACH AND EXPERIENCE CUMMULATION SOURCE: JPL, scaled CMOS reliability 2 2

3 MIL vs COTS MIL or other QPL Traceability Defined quality/reliability Wide operating temperature range Limited functionality available High unit cost Longer procurement availability Usable as is COTS Very limited traceability information Quality/reliability unknown Limited operating range Extensive functionality available Low unit cost (maybe!) Short product life-cycle obsolescence issues Usable only with careful control and qualifying as fit for use 3

4 METHODOLOGY A methodology for the selection and procurement of COTS is required, including: Risk assessment (functionality risks, production risks and support risks). Parts selection (obsolescence, environmental and design considerations and manufacturer production flow and know-how). Component reliability assurance (characterization, screening and validation). All of these activities must be performed by experienced component specialists and test houses to ensure all possible concerns and risks are identified and alleviated. 4

5 SPECIFIC CONCERNS Alter proposes an integrated solution starting at design phase for obsolescence and counterfeit detection and elimination Obsolescence Preliminary review of selected parts Analysis for risk and identification of alternative options Permanent monitoring for active designs In-house capability for alternative solutions Counterfeits Integration of activities into the supply chain In house capability for procurement and counterfeit detection Elimination of risk before parts enter the test flow 5

6 COUNTERFEITS Alter proposal includes: Parts sources validation prior to place purchase orders Procurement of single lots. Validation upon reception. In house availability of all required tools and inspections No die inside No need for additional inspections at manufacturing lines No Comment 6

7 PRECAUTIONS Procurement from a reliable source Counterfeit detection process RoHS Lead finish determination Material identification Re-tinning process, outgassing Risk analysis Available package Compatible with mounting techniques Temperature range Capable to operate safely at maximum and minimum application temperatures Lot homogeinity Possibility to obtain parts forming an homogeneous lot Evaluation data validity Process monitoring Manufacturing changes (die and package related) traceable Product life cycle Obsolesence monitoring Alternative solutions Product availability needs 7

8 HERMETIC COTS Procurement of Commercial products in Die form It would consist to select either A stand-alone Commercial component, available in die/wafer form, To develop an ASIC, then to industrialize it according the project Quality Assurance requirements. These activities will be split as: 1. Silicon process evaluation (Reliability, Radiations) 2. To manufacture Prototypes in Plastic/Ceramic packages 3. Following the User approval, to industrialize Components according Space rules Benefits: All activities under control, Single Lot Date Code managed by ALTER, Full traceability. 8

9 ASIC ALTERNATIVE Alter supports customers on the overall process Customer need identification Product definition Partners identification Product manufacturing Selection and coordination of partners for subcontracted activities is a key factor Alter partners with Arquimea for the development of mixed signal ASIC EXPERIENCE Radiation tolerant analogue mixed signal technology survey and test vehicle design for cosmic vision (ESA) Front-end readout ASIC technology study and development test vehicles for cosmic vision (ESA) Space qualified mixed signal ASIC (Direct Radiating Array antennas elements control) for REDSAT (EADS Casa Espacio) Space qualified mixed signal ASIC (Front-end electronics for Optical wireless communication system) for METNET (INTA) Rad-hard ASIC structures in deep sub-micron tecnologies (Catrene, EU) Particles detection high proximity readout electronics ASIC for Hyde-Gaspard 9

10 PROCEDURE PHASES 10

11 PHASE 1 APPLICATION 11

12 PHASE 2 - PROCUREMENT PROCUREMENT Requires specific steps and cautions to ensure parts received are suitable for our application and test performed are representative of the whole lot. REQUIREMENTS 1. Procurement only from a source approved by the component manufacturer 2. Approved pedigree 3. Genuine shipping paperwork, traceable to component lot/date code 4. Suitable shipping packaging 5. Successfully passed the Component Review and Manufacturer Review of Phase 1 6. Their product and technology roadmaps researched 7. Fitness for use complying with the application/design rules 12

13 PHASE 2 CA/EVALUATION CONSTRUCTIONAL ANALYSIS AND EVALUATION Test performed to validate the quality and reliability of the selected part. They will also provide information about how using the parts and their expected performance. REQUIREMENTS 1. Test sequence may be defined taking into account specific characteristics of the product to be tested. 2. Information obtained is not only usable to validate the product but also provides guidance for the definition of the screening acceptance criteria based on product capability and application needs. 3. Must be performed on representative parts of the flight lot. 13

14 PHASE 2 RADIATION RADIATION EVALUATION Key on commercial parts which are not designed to work in a radiation environment. It can be performed either during the evaluation phase (confidence on representativeness of the flight lot must be provided) or during lot validation. REQUIREMENTS 1. A detailed technology assessment must be done in order to identify the effects susceptible to affect the parts (TID, ELDRS, DD, SEE). 2. Must be adapted to the mission needs. 3. It is not a go - no - go test. Allows identifying weaknesses and analysing impact in our equipment. 14

15 PHASE 3 SCREENING SCREENING Applied to the flight parts it ensures they are capable to support the intended application and are not jeopardizing the mission. REQUIREMENTS 1. The screening flow must be adapted to the mission requirements. 2. It must not overstress parts inducing long term reliability issues. 3. Cumulated knowledge and experience allow properly defining the correct screening flow. 4. Special care must be paid not to exceed the maximum operation conditions (i.e. voltage, temperature, etc.) 15

16 PHASE 4 LOT VALIDATION LOT VALIDATION Performed on screened parts to provide confidence for long term reliability and to confirm the screening has no negative impacts REQUIREMENTS 1. Mechanical and electrical reliability tests performed. 2. Typically includes thermal cycling and life test. 3. Only one test sequence can be used for both lot validation and evaluation if performed after screening but there is always the risk of scrapping the lot due to evaluation failure. 16

17 EXISTING STANDARDS DOCUMENTS PEM-INST-001, Instructions for PEM Selection, Screening and Qualification (NASA) ECSS-Q-ST-60-13, Commercial electrical, electronic and electromechanical (EEE) components (ESA). In development. ALT-ATGSP-TN-3, Management of COTS for space applications (ALTER Technology) ANALYSIS 1. It is difficult to cover all possible requirements in a single document. 2. Analysing project requirements and product specifics allows to better define product procurement scheme and testing flows. 3. A specific risk assessment is required for each product even when using the above documents as reference. 17

18 EXAMPLE CONST. ANALYSIS 18

19 EXAMPLE EVALUATION 19

20 SUMMARY A wide experience in the procurement and testing of COTS is required. This approach has been used on several project either as baseline or whenever no hi-rel product was available. All tests must be performed in-house, allowing control on every step and minimizing cost and product handling. ALTER is a recognized testing laboratory by the European Space Agency and customers worldwide capable to cope with the above requirements. 20