Melexis Quality System

Quality Capability

Delivery quality is continuously controlled and verified by use of well tried quality techniques and methods.

Comprehensive quality verifications of products to be delivered

-100 % Final test (e.g. electrical parameter, function for specified operating range)
-additional optical and electrical QA (Quality Acceptance) tests on sample base (sample plan acc. to ISO 2859) ; the acceptance criteria for attribute characteristics are zero defects (acc. to automotive requirements)
-continuous monitoring and improvement of AOQ (Average Outgoing Quality) -value
-product audits as part of Conformance tests as well as dock- audits (packaging, shipping)

Regular tracking and continuous improvement of quality parameters such as quality characteristics in design, long time reliability, early failure rate, incoming quality, process capability, yield, cycle time, AOQ, delivery performance, customer return rate etc.

Customer information system about process changes (Process Change Notification) acc. to AEC-Q100 or MIL 38535 or JEDEC Standard No.47 (production process, equipment, subcontractors, material, assembly, etc.)

Development of and closed co-operation with subcontractors and suppliers

-defined procedures for supplier selection , -approval and -monitoring
-supplier assessment and -pricing periodically
-extensive exchange of information by use of modern communication and data exchange tools
-agreements relating quality management and environmental management measures, audits, test methods, data responses, suppliers performance, ppm, ship-to-stock etc.

Processing of customer returns in defined time (start within 24h, electrical test until 48h, failure analysis, corrective action, 8D -Final report within 10 working days)

Use of sophisticated and well tried SPC methods, e.g. for calculation of capability indices for measurement equipment, manufacturing processes as well as for products (especially applicable for automotive projects)

Purpose

Assessing Criteria

Guidelines for Acceptance

Measurement System Capability

Suitability of equipment for

-Measurement of specific device characteristic

-correct product verification

Calculation of measurement uncertainty, (in % of the tolerance T)

Goal:

6 sigma (MS) <10% of T

6 sigma (MS) under 10% of T is acceptable

6 sigma (MS) 10% to 30% of T is marginal acceptable

6 sigma (MS) over 30% of T is not acceptable

Product Capability

Fulfilment of defined customer- and process requirements

-Information for IC- Design

-Determination of guard-bands

regarding measurements at

lower and upper operating

temperature

Calculation of capability indices Cpk;

(for each measured parameter at lower/ upper operating temperature and room temperature)

Goal is:

Cpk more than 1.33

Cpk less than 1.0 is not acceptable (improvement necessary)

Process Capability

-Continuous process control

(for critical process parameter)

Parameter Stability Analysis

Detecting of critical parameter drift within the specified limits, due to life testing or other stress tests

Assessing on the basis of average drift, standard deviation and cpk- changes

No critical parameter drift

(Cpk-value not below 1.0)

Melexis Quality System

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Quality Capability