Management Supertex, Inc. committed continued enhancement product exce
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Quality Assurance
Management Supertex, Inc. committed continued enhancement product excellence service through dynamics Reliability Quality Assurance System, through integrity people, through many professional disciplines engaged product development process innovation. chartered responsibility Reliability Quality Assurance Director oversee ensure enforcement Supertex's Quality System. timely review undertaken ensure continued development Quality System that maintains competitive stance with marketplace meets customer requirements. Process/Product Qualification Product Design Evaluations Reliability Assurance Monitors Document Control primary responsibilities Document Control department translate format internal operating procedures customer requirements into system regulatory written instructions. Document Control functions ensure documentation integrity establishing maintaining procedures for: Initiating, revising, approving, distributing, recalling, archiving documents.
Primary Charter Departments
In-Process primary responsibilities Quality Control Department establish maintain effective controls monitoring manufacturing processes equipment; provide real time feedback information concerning state-of-control; initiate statistically valid techniques further improve quality reliability levels. This concept used extensively limited following major Quality Control functions: Incoming Materials In-process Wafer Fabrication In-process Assembly Quality Assurance (Standard Hi-Reliability) primary responsibilities Quality Assurance Department assure that delivered product meets workmanship standards imposed standard hi-reliability products and/or special customer requirements. This accomplished through program process controls gate inspections designed that devices properly tested sampled prior shipment. Real time feedback, concerning control/inspection data, keeps relevant personnel fully informed quality level product going through final test operations. Major Quality Assurance functions include: Incoming Contract Subassemblies Outgoing Wafer Electrical Visual Inspection Product Assurance Electrical Test Plant Clearance
Organization
Director Quality Assurance/Quality Control reports directly executive staff level Management. Reliability Assurance Management maintains dual level reporting; with direct report Manager program coordination dotted line Product Vice President respective product service Reliability Assurance support. responsibility Director administer planning, organization, execution, surveillance, appraisal, corrective action documentation Quality Programs. character, responsibility authority vested with Director will establish means attain necessary quality reliability objectives aspects manufacturing within accorded guidelines this manual. Quality programs administered Department support following functions: Operator Training Supertex maintains System Operator Training Qualification specific nature complexity each manufacturing operation, inspection, test requirement. basic training approach used Supertex supervised on-the-job training assisted experienced/qualified personnel provide "buddy system" training. Training typically performed with same equipment tools used normal manufacturing environment. training aids, such films, photographs demonstrations equipment tools, typical. Each department manager responsible training evaluation workmanship performance manufacturing norms. department maintains system audits/monitors evaluating operator's adherence specification quality workmanship. Material Procurement Qualification Supertex maintains system that ensures economical control conformance detailed technical quality requirements purchased materials
Reliability primary responsibility Reliability function assure that high consistent level product reliability continually being produced. Reliability Department establishes, defines maintains evaluation programs determine process/product reliability. Major Reliability activities include: Failure Analysis Hi-Reliability Program
(direct critical indirect). Material procurement performed through regulated specifications drawings. functions within this system providing following services: Documented instructions material evaluation, procedures, flow, workmanship standards, test methods statistical sampling. Incoming inspection materials. Identification segregation qualified nonconforming material. Vendor qualification ongoing vendor performance appraisal. Feedback inspection results informing suppliers design changes materials. Formal review disposition nonconforming materials. Equipment Calibration Supertex maintains Calibration System that ensures measurement accuracy equipment used determine product workmanship acceptability. Calibration System conforms MIL-STD-45662. Major provisions program described follows: Qualification external calibration services. Traceability references National Institution Standards Technology. Identifications measurement test equipment (electrical, mechanical, optical) type frequency calibration. Document file certifying equipment calibration recall history. Management report recall status. audits equipment calibration (date stickers recall designation). Manufacturing Flow, Inspection, Test Points Supertex maintains Flow Charts that describe sequential steps semiconductor processing associated documentation Wafer Fabrication, Assembly, Post Assembly Finishing through Final Outgoing Plant Clearance. Flow charts prepared each product family associated manufacturing technology. Flow charts that delineate Fabrication processing regarded proprietary available external dissemination without prior approvals from Manager respective Product/ Operations Vice President. Applicable Assembly Packaging Flow Charts available upon request. Flow charts Customer Hi-Reliability Products documented detailed traveler which defines sequential operations, manufacturing inspection points, Customer Source Inspection points, Quality Assurance product sample acceptance points. In-Process Quality Control Quality Control system measurement surveillance. System comprised visual, dimensional, structural, electrical characterization material from incoming receipt goods outgoing finished product. Information obtained provides management with overview state-of-the-process specifically quantifying position product yield, quality, reliability. Major elements found Supertex's Quality Control Program summarized limited following: Environmental monitors (Airborne Particle counts, temperature). Routine Scanning Electron Micrography (SEM) semiconductor devices. Specification compliance audits. Random monitor wafers in-process.
Electrostatic discharge prevention/monitor. Product sample qualification critical manufacturing points. Wafer/die electrical sort monitor. Quality performance/trend data reporting. Return material analysis reporting. Monitoring storage, handling, packaging, identification materials, work-in-process, finished product.
Product Assurance Inspection Supertex maintains system Product Qualification through inspection test finished product prior customer shipment. Quality Assurance department provides inspection based statistical sampling ensure that outgoing product quality meets internal workmanship standards customer procurement requirements. following process controls, inspections, tests, documentation requirements assured prior submission product Customer Source Inspection final Outgoing Plant Clearance: Test equipment correlation qualification. Monitor manufacturing test operations. Ensure conformance product lots detailed customer test requirements (electrical, external visual, mechanical). Assure proper complete documentation each product lot, both in-process at-plant clearance. Reliability Assurance Supertex Reliability Concept introduced design phase products. factors that affect product reliability are: compatibility fabrication process, circuit layout characteristics, assembly process, package materials, application. Hence, Reliability Engineering involved evaluating critical factors reliability, starting with design first prototype functional circuit. From analysis, modification design, wafer fabrication, assembly, process changes implemented enhance reliability product. Approval given release product manufacturing only after reliability product established acceptable within standard norms. Reliability Department provides Product Group with number programs define product reliability levels. Among these programs are: Qualification, Reliability, Failure Analysis, Data Collection Presentation. Qualification Program Products Processes Procedures qualification product designs require Reliability participation approval design reviews, documentation, characterization, reliability stress studies. package qualification approved released production Reliability after prescribed environmental tests have been successfully completed. Qualification product granted only after Quality Reliability have completed evaluation process control studies. Significant modifications existing processes treated processes purpose qualification. Proper documentation changes process steps procedure, improved designs material, assured Reliability's approval. Reliability Monitor Programs Device Package Reliability Monitor Programs effected packages using variety device types maximize data usefulness evaluate cost effectiveness equipment.
Packages evaluated using applicable methods MILSTD-883; Class MIL-STD-750, appropriate. Data reported, specified, detailed procedures each package-chip combination. Package Monitor programs include, limited following general tests, using appropriate conditions specified MIL-STD-883, Class Method 5005: Condition Operating Life (HTRB) Steam Pressure (Molded packages) Temperature Cycling Package Hermeticity Intermittent Opens (Molded package) Salt Atmosphere (Initial Qual, only) Constant Acceleration Mechanical Shock (Initial Qual, only) Solderability Lead Integrity Vibration (Initial Qual, only) Biased Temperature Humidity (Molded packages) Method 1005 1010 1014 1009 2001 2002 2003 2004 2007
Reliability responsible assisting Marketing department preparation publications distribution field sales locations customers. Presently, in-house Reliability Assurance testing supplemented testing done outside Test Laboratories that have been approved DESC performing MIL-STD testing. addition, Reliability Assurance maintains routine monitor commercial grade finished product evaluate reliability attributes against internally published norms. Products packages deliberately selected represent typical characteristics conditions manufacturing with following considerations given: Design complexity fabrication processing technology. Package type/assembly construction materials. Assembly plant location. Supertex reliability data standard product published internal use. Specific reliability information made available customers upon request. Plant Clearance Inspection Supertex maintains Final Outgoing Inspection Finished assembled/tested product ensure that conditions processing have been satisfied that support documentation, specified contract, maintained each shipped lot. Provisions control shipped product during Outgoing Plant Clearance Final Acceptance Program structured ensure product workmanship guarantees met.
Accelerated Stress Monitor Programs conducted obtain timely feedback process evaluations, well ultimate device capability studies. Failure Analysis policy Supertex perform analysis defective product utilize resulting findings improve product yield integrity. Reliability Engineering also performs failure analysis mode mechanism failures (both from routine reliability tests customer returns). Failure Analysis Support Activities include: Qualification existing products applications. Customer Qualifications. Reliability responsible review acceptance customer requirements. When qualification programs special testing required, Reliability designs implements appropriate test plans coordinates with customer. Failure analysis, support In-Process Quality Control monitors, handled Reliability through Failure Report Requests. This support includes such services visual inspection, metalography, thickness measurements, selective etching, probing. Customer's requests failure analysis filled Reliability, which coordinates replies customers approves correspondence outside Company. Where Reliability determined that corrective action necessary prior release product shipment, proceed further production processing, Corrective Action Request generated Reliability. shipment occur integrity product reliability would jeopardized. Reporting Publication Data Qualification test reports prepared distributed Reliability certified products processes which have been formally qualified released manufacturing.
Summary
Supertex maintains Programs critical operations assure that products manufactured under documented controlled system consistency workmanship standards (fit, form, function, reliability). following Standards Specifications have been integrated into Supertex's manufacturing operations process control programs: International Standard, Quality Management Quality System. FED-STD-209 Clean Room Work Station Require ments, Controlled Environments. DOD-HDBK-263 Electrostatic Discharge Control Handbook Protection Electrical Electronic Parts, Assemblies Equipment DOD-STD-1686 Electrostatic Discharge Control Program Protection Electrical Elec tronic Parts, Assemblies Equipment. MIL-PRF-38535 Microcircuits, General Specification For. MIL-Q-9858 Quality Program Requirements. MIL-I-45208 Inspection Systems. MIL-PRF-19500 Semiconductor Devices, General Specification For. MIL-STD-105 Sampling Procedures Tables Inspection Attributes. MIL-STD-750 Test Methods Semiconductor Devices. MIL-STD-883 Test Method Procedures Microelectronics. MIL-STD-202 Test Methods Electronic Electrical Component Parts. MIL-STD-45662 Calibration System Requirements. Special Customer Specifications 9001
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