1、 EIA/ECA STANDARD LOW VOLTAGE SUPPLEMENTAL FUSE QUALIFICATION SPECIFICATION EIA/ECA-962 MARCH 2006 ELECTRONIC COMPONENTS, ASSEMBLIES & MATERIALS ASSOCIATION THE ELECTRONIC COMPONENTS SECTOR OF THE ELECTRONIC INDUSTRIES ALLIANCE NOTICE EIA Engineering Standards and Publications are designed to serve
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7、atory limitations before its use. (From PN-5073 formulated under the cognizance of the P-14 Committee on Overcurrent Protection Devices). Published by ELECTRONIC INDUSTRIES ALLIANCE 2006 Technology Strategy & Standards Department 2500 Wilson Boulevard Arlington, VA 22201 PRICE: Please refer to the c
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10、-7179), International (303-397-7956) Low Voltage Supplemental Fuse Qualification Specification EIA-962 Page 1 1 Scope 1.1 Description This specification defines the qualification program for low voltage, supplemental fuses. Fuses covered will be limited to axial-leaded, radial-leaded and surface mou
11、nt configurations having a current rating of no greater than 60 A, maximum voltage rating of 600 VAC/DC and interrupting rating of 10,000 A maximum. The qualification program is defined in table 1, and the flow diagram. Specification sheets can be added, as required, to define specific products or t
12、o cover unique / specific requirements. This document does not relieve the suppliers of their responsibility to maintain their own companys internal qualification program and the fuses shall continue to meet all applicable requirements of UL 248-14 / CSA-C22.2 No. 248.14. Three types of fuses are co
13、vered in this specification. They include: Type I - The type I fuse is designed to operate (open) within a given time period at 200% overload. The remainder of this specification is written with the 200% overload test as the standard. Type II - The type II fuse is designed to operate (open) within a
14、 given time period at 250% overload. For a Type II fuse, the 250% overload shall be substituted throughout this specification where 200% overload is noted. All other requirements shall continue to be met. Type III - The type III fuse is designed to operate (open) within a given time period at 300% o
15、verload. For a Type III fuse, the 300% overload shall be substituted throughout this specification where 200% overload is noted. All other requirements shall continue to be met. 1.2 Preconditioning This process is intended to simulate exposure to the thermal and cleaning environments of the assembly
16、 process before qualification testing. The component assembly process simulation requirements for different types of processes are described in annex A. 1.3 Reference documents The current revision of the referenced documents will be that in effect at the date of agreement to the qualification plan.
17、 Subsequent qualification plans will automatically use the latest revisions of these referenced documents. MIL-STD-202 Test Methods for Electronic and Electrical Component Parts MIL-STD-883 Test Methods and Procedures for Microelectronics MIL-HDBK-H53 Military Handbook - Guide for Attribute Lot Samp
18、ling Inspection UL-94 Tests for Flammability of Plastic Materials Low Voltage Supplemental Fuse Qualification Specification EIA-962 Page 2 UL-248-1/ Low-Voltage Fuses, Part 1: General Requirements CSA-C22.2 No. 248.1 UL-248-14 / Low Voltage Fuses, Part 14: Supplemental Fuses CSA-C22.2 No. 248.14 IEC
19、-60695-2-2 Needle-Flame Test ASTM-2863 Flammability of Plastics Using the Oxygen Index Method ANSI/J-STD-002 Solderability Tests for Component Leads, Terminations, Lugs, Terminals and Wires EIA 554 Method Selection for Assessment of non Conforming Levels in Parts Per Million (PPM) 2 General requirem
20、ents This section includes requirements with the intention of developing a set of robust qualification tests that would enable a supplier to leverage test results to satisfy the requirements of multiple original equipment manufacturer (OEM) customers. 2.1 Objective The objective of this qualificatio
21、n program is to ensure that the device to be qualified meets a minimum set of stress test driven qualification requirements. 2.2 Generic Data 2.2.1 The use of generic data to satisfy qualification requirements The use of generic data for qualification will be based on specific requirements associate
22、d with each characteristic of the fuse and manufacturing process. These requirements, listed in table 1, are the same for both new processes and re-qualification associated with a process change. A maximum negotiable set of qualification tests must be performed for the appropriate changes proposed f
23、or the component. 2.2.2 “Qualification families”, defines the criteria by which components are grouped into a qualification family for the purpose of considering all data from one component to another in the family and generically applicable for qualification. For each stress test, two or more quali
24、fication families can be combined if reasoning for this is technically sound, supported by data and periodically reviewed for soundness of original assumptions. With proper attention to these qualification guidelines, greater information applicable to other fuses in the family can be accumulated and
25、 used to demonstrate their reliability so that qualification testing on new fuses entering a family can be minimized. For example, this can be achieved through extensive qualification and monitoring of the most complex fuse in the reliability family and applied to less complex fuses that subsequentl
26、y join this family. Sources of generic data should come from supplier-certified test labs, and can include internal suppliers qualification, user qualifications and suppliers in-process monitors, as long as the test conditions and endpoint test temperatures address the worst case temperature extreme
27、s and designed product life for the Low Voltage Supplemental Fuse Qualification Specification EIA-962 Page 3 application of the user requesting the qualification. 2.2.2 Qualification families The qualification samples must represent the same manufacturing process, materials and formulation. The supp
28、lier will provide a complete description of each process and material of significance. Samples shall represent two different current values within the family (where two different values exist) and be separated by at least one week of manufacture. There must be valid and obvious links between the dat
29、a and the subject of qualification. 2.2.3 Manufacturing site (fabrication and assembly) Each manufacturing site, and line, is to be considered independently for site qualification, meaning that the site is proven to be capable (resources and equipment) of running particular processes with adequate y
30、ields (to be determined by the supplier). In other words, a site cannot be qualified based on the results from a different location. Qualification families do not apply across manufacturing sites. 2.3 Test samples 2.3.1 Lot requirements Test samples shall consist of representative fuses from the qua
31、lification family. Multiple lot samples are specified in table 1, and test samples must be composed of approximately equal numbers from three lots, with each assembly lot being manufactured at least one week apart. When applicable, the samples shall include fuses having current ratings representing
32、at least the lowest and highest values. The three lots may each be made up of one of these current ratings. 2.3.2 Production requirements All test samples shall be processed, production and/or quality control tested, screened and inspected at the same production site and with the same production pro
33、cess for which the fuse in the qualification family to be qualified will be manufactured for production. 2.3.3 Reusability of test samples Fuses which have been used for nondestructive qualification tests may be used to populate other qualification tests. 2.3.4 Pre- and post-stress test requirements
34、 All endpoint test temperatures (e.g., room, hot and/or cold) are specified in 4.2 to 4.14. The specific temperature must address the worst case temperature extremes and designed product life for the application of the user requesting the qualification. Low Voltage Supplemental Fuse Qualification Sp
35、ecification EIA-962 Page 4 2.4 Definition of electrical test failure after stressing Electrical test failures are defined as those fuses not meeting the individual fuse specification, criteria specific to the test, or the suppliers data sheet. 2.5 Criteria for passing qualification Passing all appro
36、priate qualification tests qualifies the fuse per this document. Any unique reliability tests or conditions requested by the user and not specified in this document shall be negotiated between the supplier and user requesting the test. 2.6 Alternative testing requirements The user shall approve all
37、deviations from the qualification requirements and conditions. All deviations shall be clearly reported when the results of the qualification are submitted to the user for approval. 2.7 Disqualification When the number of failures on the fuse for any given test in table 1 exceeds the acceptance crit
38、eria using the procedure in 2.5, the device shall be disqualified until the root cause of the failure(s) is (are) determined and corrective and preventive actions are confirmed to be effective. New samples or data may be requested to verify the above. 3 Qualification and requalification 3.1 Qualific
39、ation of a new fuse The stress test requirements and corresponding test conditions for the qualification of a new fuse are listed in table 1. For each qualification, the supplier must present data for all of these tests, either specific to the fuse to be qualified or acceptable reliability family da
40、ta. Justification for the use of generic data must be demonstrated by the supplier and approved by the user. Electrical characteristics information (DC resistance, voltage drop, current overload and interrupting current capability) shall be available from the supplier upon request. 3.2 Changes requi
41、ring requalification Changes to a fuse, or the processes used in its fabrication, will require retesting as agreed upon between the supplier and the user. The supplier and the user shall agree upon the appropriate test plan prior to starting the requalification. 3.2.1 Criteria for passing requalific
42、ation Low Voltage Supplemental Fuse Qualification Specification EIA-962 Page 5 Passing all appropriate requalification tests specified in this document as agreed to between the user and supplier qualifies the change per this document. All requalification failures shall be analyzed for root cause, an
43、d demonstration of corrective and preventative actions are required. 4 Test methods and requirements 4.1 Sampling plan Sample size per lot in table 1 is selected from one manufacturing lot. Total sample size per family shall be from a minimum of three manufacturing lots separated by at least one wee
44、k of manufacture. Only the user can authorize any reduction in this sample size. See figure B.5, Test sequence flow chart. Table 1 - Fuse qualification test program approval levels and sampling plan Test Method Fuse inspection Sample size per lot Total sample size per family Defects permitted 4.1 Sa
45、mpling plan 210 630 N/A 4.2 Visual and mechanical 5 15 0 4.3 Electrical characteristics - - - 4.3.1 DC resistance 175 525 0 4.3.2 DC voltage drop 5 15 0 4.3.3 Current carrying capacity 70 210 0 4.3.4 Overload operation 110 330 0 4.4 Environmental tests - - - 4.4.1 Life test 40 120 0 4.4.2 Load humid
46、ity test 40 120 0 4.4.3 Moisture resistance test 40 120 0 4.5 Terminal strength 15 45 0 4.6 Thermal shock 40 120 0 4.7 Case resistance 5 15 0 4.8 Solderability - - - 4.8.1 4.8.2 Solderability after steam aging 5 15 0 4.8.3 Resistance to dissolution of metallization 5 15 0 Low Voltage Supplemental Fu
47、se Qualification Specification EIA-962 Page 6 4.9 Mechanical shock (Specified Pulse) 5 15 0 4.10 Vibration, high frequency 5 15 0 4.11 Resistance to solvents 5 15 0 4.12 Flammability - - C of C 4.13 Agency approval - - C of C 4.14 Interrupting rating - - C of C Note - C of C = Certification of compl
48、iance 4.1.1 Fuse mounting Fuses shall be mounted as specified in annex A, based on fuse type, electrical rating and physical size. Each fuse sample, or test fixture position, shall be permanently and clearly identified with a sample number to permit traceability of each fuse. Testing in accordance w
49、ith performance tests and environmental tests shall be carried out after the fuses have been appropriately mounted to standard test boards, unless otherwise specified. 4.1.2 Test evaluation The DC resistance shall be measured before, and after, subjecting the samples to tests specified in 4.3 through 4.11. Any permanent change in resistance and/or voltage drop shall not exceed the values as listed when measurements made prior to testing are compared with resistance after the sample that has undergone testing is permitted to return to steady state room conditions. After exposure to
