Electronic Restoration >> How To Clean Electronic Switches

Parts represent inherently high risk or unknown risk because of the lack of formalized reliability assessment, screening and qualification. Also, there is little dependable data or flight history available for them as the continuous changes in design, materials and How To Clean Electronic Switches manufacturing processes may make the data on any particular LDC not applicable to another LDC. 

Level 3 parts are intended for mission applications where the use of high-risk parts is acceptable. Level 3 active parts shall be evaluated for radiation hardness, and How To Clean Electronic Switches radiation testing is required when information is not available. The typical mission duration for level 3 programs varies from less than 1 year to 2 years. 

Parts Control Boards (PCBs)When PCBs are required by the project MAR or implemented by the contractor or developer, the PCBshall review all parts for compliance to established criteria. Review information shall includespecifications, screening How To Clean Electronic Switches and qualification plans, supporting data, and application requirements requiredto determine acceptability. 

Parts shall be selected in accordance with appropriate part type specification andquality level listed in Table 1of each section in this document. Table 1 also indicates when screening(Table 2) and qualification testing (Table 3) are required for each risk level and How To Clean Electronic Switches part designation. Partprocurement methods are discussed below.6.2.2 

Military Drawings (JAN Certified). Parts procured to Military Specifications or Standard Military Drawings (SMDs) usually contain up to three reliability levels. Not all military levels areacceptable "as is" for space applications. For example, How To Clean Electronic Switches monolithic microcircuits offer classes V, Q, andM. Some passive devices such as resistors and capacitors are listed with S, R, or P establishedreliability levels. 

Table 1 of each section documents which levels can be used as is and which requireadditional screening. It is the responsibility of the user to ensure that DSCC drawings and How To Clean Electronic Switches other militaryspecifications satisfy the requirements specified herein, or to perform additional required inspectionsand tests specified in this document.6.2.3 

Developer Controlled Drawings (SCDs). When parts cannot be procured to MilitarySpecifications, How To Clean Electronic Switches a drawing (such as a Source Control Drawing) should be prepared by the developer tocontrol procurement requirements. The drawing shall include the screening and qualificationrequirements specified in Tables 2 and 3 of this document for the applicable part type. 

The drawingshall also include performance parameters, absolute maximum ratings, dimensions, terminaldescriptions, materials, and other unique requirements. Existing developer SCDs proposed for use shallbe evaluated for compliance to Table 2 and 3 How To Clean Electronic Switches requirements.6.2.3.1 Purchase orders for Manufacturer Screened and Qualified Parts. 

With project approval,unique screening and qualification requirements that are not normally performed by the How To Clean Electronic Switches manufacturer as part of their normal production practice may be placed directly in the purchaseorder in lieu of preparation of a developer-controlled drawing. It is the responsibility of the user torequire test data from the manufacturer in order to verify compliance.6.2.3.2 

For level 1 projects, if an acceptable Government-controlled specification is notavailable, an SCD is required. A preliminary copy of new SCDs shall be sent to the manufacturerfor coordination. If procurement of the part through a SCD is not feasible due to cost, schedule orthe availability of a manufacturer wiling to produce the part to the SCD requirements, How To Clean Electronic Switches the part maybe procured through a purchase order specifying the unique screening and qualificationrequirements as detailed in 6.2.3.1.6.2.3.3 

For level 2 projects, project parts engineer and PCB shall determine if an SCD isrequired for a part type or the purchase order as specified in 6.2.3.1 is adequate to meet project'sreliability requirements.6.2.3.4 Level 3 projects do not require SCDs. However, How To Clean Electronic Switches if an existing procurement documentis proposed for use, the SCD must meet level 3 requirements of this document for theapplicable part type. 

Manufacturer High Reliability Parts. The term "MFR HI-REL" applies to parts that areprocured to a manufacturer-controlled flow as described in the manufacturer's catalog. The part flow iscontrolled only by the How To Clean Electronic Switches manufacturer. A certificate of compliance is furnished by the manufacturer thatthey have been tested as advertised. 

These are often referred to as high reliability parts in themanufacturer's catalog. In some cases, manufacturers add very little to their commercial process flows, How To Clean Electronic Switches and yet call their product "high reliability." It is the responsibility of the user to obtain test data toverify that the screening and qualification requirements specified in this document were met.6.2.5 

Commercial Parts. For the purpose of GSFC projects, this part designation represents all partsthat do not conform to the categories defined above. These parts are procured per manufacturer's datasheet specifications. It is the responsibility of the user to assess the part manufacturer's qualitycapability to produce space quality parts How To Clean Electronic Switches and perform additional screening and qualification tests asdefined in this document.6.2.6 

Plastic Encapsulated Microcircuits (PEMs). The use of Plastic Encapsulated Microcircuitsshall be restricted to applications where no similar high reliability hermetically sealed device exists.The use of PEMs is permitted on GSFC space flight applications, provided each use is thoroughlyevaluated for thermal, mechanical, How To Clean Electronic Switches and radiation implications of the specific application and found tomeet mission requirements. 

A PEM shall not be substituted for a form, fit, and functional equivalent,high reliability, hermetic device in space flight applications. Refer to Section M4 on the detailedinstructions for selection, screening qualification, and derating of these parts. Due to significant lot-tolot variability that can occur in the fabrication processes and technology, How To Clean Electronic Switches each procurement of PEMsrequires a separate evaluation that includes radiation effects. 

The use of Plastic Encapsulated semiconductor devices and hybrids shall follow similar guidelines as for PEMs. Commercial Off-the-Shelf (COTS) Assemblies and Sub-Assemblies. Occasionally it is necessaryto use sensors or other equipment of commercial origin. When commercial units or assemblies arepurchased as off-the-shelf hardware items, How To Clean Electronic Switches PCB shall review their function and reliability for missioncriticality. 

Critical Applications for COTS. When failure of such units represents significantcompromise to mission success, an analysis of the parts for compliance to the requirements of thisdocument shall be performed. Following the results of this analysis, units may be required toundergo modification for use of higher reliability parts, How To Clean Electronic Switches or radiation hardened parts. 

All upgradeparts shall be subject to PCB approval. Modifications such as additional shielding for radiationeffectiveness or replacement of radiation soft parts with radiation hardened parts, How To Clean Electronic Switches may berecommended and may be performed at the user's facility or user-approved facility.

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