Electronic Restoration >> Water Damage Guitar Restoration Tips

For detailed instructions on PEM requirements and test procedures, including screening, qualification, DPA test procedure, additional evaluation analysis, derating, and handling and storage guidelines refer to Instructions for PEM Selection, Screening,  Water Damage Guitar Restoration Tips and Qualification, PEM- INST-001.

Refer to paragraph 6.0, Instructions, pages 4 through 10, Water Damage Guitar Restoration Tips  of Section 1 for general part requirements applicable to all part types.1.2/ PEMs qualified according to this document are intended for operation within the manufacturer's data sheet limits. 

Any uprating and use of PEMs outside the manufacturer's specified range, particularly the temperature limits, is not acceptable.1.3/ Radiation Lot Acceptance Testing (RLAT) of PEMs shall be performed independently of any data that may exist for equivalent or similar hermetically sealed devices,  Water Damage Guitar Restoration Tips and should be performed under the direction of the project radiation specialist. 

This is necessary as market conditions may drive unannounced process changes, Water Damage Guitar Restoration Tips  creating differences in radiation response.1.4/ Most of the requirements described in this document are also applicable to commercial discrete and hybrid semiconductor devices encapsulated in plastics.

However, for some parts tailoring of the screening, qualification, and DPA procedures might be necessary. Water Damage Guitar Restoration Tips  In this case adjustments of the procedures for a particular part type should be done by the project parts engineer and approved by code 562. For discrete semiconductor devices refer to MIL-STD-750 for the appropriate test methods.

2/ Qualification by Flight History or similarity is not acceptable for PEMs.  Water Damage Guitar Restoration Tips Commercial PEM manufacturers are known to produce the same part number with die sourced from different wafer lots having different die revisions. 

The same part number may also be made by multiple production plants and processed according to requirements that vary between wafer and assembly plants.3/ DPA for PEMs shall focus on three major areas of concerns: 1) integrity of the package, Water Damage Guitar Restoration Tips  2) quality of assembly, and 3) defects in the die. 

This analysis shall also evaluate package and die-level homogeneity of the lot. When obvious gross defects are revealed during DPA, it is usually anindication that manufacturer's processes are out of control, Water Damage Guitar Restoration Tips and a replacement of the lot might be required. Therefore, it is recommended that DPA be performed prior to screening and qualification of the lot. 

Additional evaluations might be necessary to further mitigate risks associated with the use of PEMs (refer to section 6 of PEM-INST-001). Screening is performed on 100% of flight parts.1.2/ Historically,  Water Damage Guitar Restoration Tips only parts with tight lot-specific controls imposed during manufacturing had been allowed for applications in level 1 projects. 

Such a control is impossible for PEMs, and the suggested screening procedures are not considered as a substitute for manufacturing control, Water Damage Guitar Restoration Tips but rather as risk mitigation measures.1.3/ It is the responsibility of the project parts engineer to submit screening test results to Code 562 for logging into the Code 562 PEM database.

2/ It is recommended to combine the incoming/outgoing visual inspections with the serialization and packaging to reduce handling  Water Damage Guitar Restoration Tips and possible damage to the parts. Serialization should be performed in such a way to allow a topside C-SAM inspection. 

Flight parts should be handled and stored in a manner to prevent mechanical and ESD damage, contamination, and moisture absorption (see Section 8 of PEM-INST-001).3/ To minimize handling,  Water Damage Guitar Restoration Tips only a top view X-ray inspection is required. Focus to inspect for wire sweeping and obvious defects in the part. 

Depending on the results of the top view X-ray and/or part construction, a side view may be required.4/ Acoustic Microscopy (C-SAM)4.1/ General. Acoustic microscopy is performed to screen out defects at critical die surface and lead tip wire-bond areas of the parts and screening,  Water Damage Guitar Restoration Tips except for power devices, is performed only at the topside.

4.2/ Coated Die. Topside of the internal portion of the leads is inspected in PEMs with polymer die coating. Inspection of the die area is not required, Water Damage Guitar Restoration Tips as the die coating has a low acoustic impedance that appears as a false delamination. 4.3/ Power Devices. 

For power parts, the bottom side inspection of die attachment might be replaced with the thermal impedance measurements.4.4/ Rejection Criteria . Any measurable amount of delamination between molding compound and the die surface.   Water Damage Guitar Restoration Tips Any delaminations on the leads at wire bond areas.  

Delaminations extending more than 2/3 the length of internal part of the leads.5/ Electrical Measurements 5.1/ Special Testing. In addition to parametric and functional measurements per data sheets, supplement and/or innovative testing techniques (e.g. IDDQ leakage currents,  Water Damage Guitar Restoration Tips thermal impedance, output noise, etc.) can be used to select better quality parts from the lot (cherry pick) as flight candidates. 

These techniques should be certified and approved by Code 562.5.2/ Failure modes (parametric or catastrophic) should be recorded for each failed part.6/ Engineering review.6.1/  Water Damage Guitar Restoration Tips More than 10% CSAM rejects might require additional evaluation of thermo-mechanical integrity of the lot or its replacement.

6.2/ Most established PEMs manufacturers guarantees 3-sigma level process minimum, which means that less than 0.27% of the parts can be out of specification. Excessive fall outs during initial electrical measurements at room temperature might be due to a poor quality of the lot,  Water Damage Guitar Restoration Tips effect of temperature cycling performed before electrical measurements, or it might be an indication of problems with the testing lab. 

When excessive rejects are experienced, the project PE decides whether a lot replacement  Water Damage Guitar Restoration Tips or additional evaluation is needed based on observed failure modes and results of failure analysis. Excessive rejects during initial electrical measurements might be a legitimate cause for lot replacement.7/ Burn-in (BI)7.1/ General. 

Burn-in is a complex, product-specific test and if possible should be conducted by the manufacturer of the part. If a user performs this test,special care should be taken not to exceed maximum current, voltage,  Water Damage Guitar Restoration Tips and die temperature limits.7.2/ Burn-in Temperature. 

The BI temperature is a "stress ” temperature used to precipitate failure of defective parts and is typically much higher than the operational temperature of the part,  Water Damage Guitar Restoration Tips where the characteristics are guaranteed to remain within the data sheet limits. 

Most PEM manufacturers use temperatures in the range from 125 °C to 150 °C to periodically perform BI to monitor quality of their product. However, Water Damage Guitar Restoration Tips  if the parts engineer is unable to justify the suitability of burn-in at 125 °C, the burn-in ambient temperature shall be limited to the maximum operating temperature per the device specifications provided by the manufacturer.

7.3/ Junction Temperature. The junction temperature during BI testing should not exceed the absolute maximum rated junction temperature for the part.7.4/ Molding Material Glass Transition Temperature. When the die temperature is close to or exceeds the glass transition temperature (Tg) of the molding compound (MC), Water Damage Guitar Restoration Tips electrical and mechanical properties of MC may change significantly and new degradation mechanisms may cause failures of the part. 

For most molding compounds, Tg values exceed 140 to 150 °C, which gives a necessary temperature margin for 125 °C BI. Reliability of the PEMs, which are manufactured with low-Tg molding compounds (Tg < 120 °C), is difficult to assess Water Damage Guitar Restoration Tips , and such parts are not recommended for space projects without additional extensive analysis and testing. Glass transition temperature measurements are recommended prior to BI if usage of low-Tg molding compound for the lot is suspected.

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