01010116| Datasheet

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Quality

In order to meet the high technical demands of a free world market, the EPCOS Ceramic Components Division has established a sophisticated quality assurance system. This is based on the standards QS-9000/VDA 6.1, ISO 9001 and CECC as well as on customer requirements. Certification to QS-9000/VDA 6.1 was obtained in October 1997, certification to ISO 9001 in September 1991. 5.1 Quality assurance procedure

SIOV varistors are tested and released by the quality department on the basis of the following criteria: compliance with type specifications, process capability of production equipment as well as accuracy of measuring and test methods and equipment. To ensure a constantly high quality level, the following tests are carried out: 5.1.1 Incoming goods inspection

The properties of the parts and materials required for production are defined in close cooperation with qualified suppliers. Quality is ensured by quality assurance measures at the supplier as well as by quality assurance agreements (QSV) and defined inspection procedures for incoming goods. 5.1.2 Process control

A variety of measures is implemented wherever possible at the source in order to achieve the objective of eliminating defects as efficiently as possible. Already at the preliminary stage, FMEA (Failure Mode and Effects Analysis) is applied: potential errors are given a risk priority number corresponding to their significance and the probability of their occurrence and detection. If the risk priority number is high, remedial measures are introduced right from the start. During production, the processes are monitored using SPC (Statistical Process Control) methods: on-the-spot action is taken immediately if a process starts to deviate from the desired results. All important manufacturing processes are continuously monitored, parallel to the production process. 5.1.3 Product assurance

Each manufacturing stage is followed by a "quality control gate", i. e. the product is only released for the next stage after passing a corresponding test. The test results are constantly monitored and evaluated and are then used to assess the quality of the manufacturing process itself. The flow charts (table 5 and table 6) assign the major quality measures to the different production steps. 5.1.4 Final inspection

The electrical characteristics, dimensions and material quality of SIOV varistors are checked in a final inspection in accordance with the required specifications. 5.2 AOQ

For SIOV varistors an AOQ (average outgoing quality) figure of < 10 dpm (defectives per million) is given. This value refers to inoperatives defined as follows: Inoperatives of varistors are: I Short circuit or open circuit I Component, case, terminals or encapsulation broken I Incorrect marking I Mixing of different types Other defects are: I Electrical defects (maximum ratings are exceeded) I Mechanical defects, e.g. incorrect dimensions, damaged housings, illegible marking, twisted leads 101 04/02