{"id":422999,"date":"2024-10-20T06:44:02","date_gmt":"2024-10-20T06:44:02","guid":{"rendered":"https:\/\/pdfstandards.shop\/product\/uncategorized\/bs-en-iec-60539-12023\/"},"modified":"2024-10-26T12:38:00","modified_gmt":"2024-10-26T12:38:00","slug":"bs-en-iec-60539-12023","status":"publish","type":"product","link":"https:\/\/pdfstandards.shop\/product\/publishers\/bsi\/bs-en-iec-60539-12023\/","title":{"rendered":"BS EN IEC 60539-1:2023"},"content":{"rendered":"

IEC 60539-1:2022 is applicable to directly heated negative temperature coefficient thermistors, typically made from transition metal oxide materials with semiconducting properties. It establishes standard terms, inspection procedures and methods of test for use in sectional and detail specifications of electronic components for quality assessment or any other purpose. This edition includes the following significant technical changes with respect to the previous edition: <\/p>\n

    \n
  1. Restructured completely to comply to ISO\/IEC directives; categorization and reorganization of test methods into these categories;<\/li>\n
  2. Annex X added for comparison to the previous edition;<\/li>\n
  3. Some wordings, figures and references have been revised.<\/li>\n<\/ol>\n

    PDF Catalog<\/h4>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
    PDF Pages<\/th>\nPDF Title<\/th>\n<\/tr>\n
    2<\/td>\nundefined <\/td>\n<\/tr>\n
    7<\/td>\nAnnex A (normative)Normative references to international publicationswith their corresponding European publications <\/td>\n<\/tr>\n
    10<\/td>\nBlank Page <\/td>\n<\/tr>\n
    11<\/td>\nEnglish
    CONTENTS <\/td>\n<\/tr>\n
    17<\/td>\nFOREWORD <\/td>\n<\/tr>\n
    19<\/td>\n1 Scope
    2 Normative references <\/td>\n<\/tr>\n
    20<\/td>\n3 Terms and definitions <\/td>\n<\/tr>\n
    23<\/td>\nFigures
    Figure 1 \u2013 Typical resistance-temperature characteristic for NTC thermistors <\/td>\n<\/tr>\n
    25<\/td>\nFigure 2 \u2013 Decreased power dissipation curve <\/td>\n<\/tr>\n
    27<\/td>\nFigure 3 \u2013 Maximum current derating <\/td>\n<\/tr>\n
    30<\/td>\n4 General items
    4.1 Units and symbols
    4.2 Preferred values and appropriate category
    4.2.1 General
    4.2.2 Appropriate category
    4.3 Marking
    4.3.1 General
    Tables
    Table 1 \u2013 Lower and upper category temperatures and duration ofthe damp heat, steady state test <\/td>\n<\/tr>\n
    31<\/td>\n4.3.2 Marking for small size types such as surface mount NTC thermistors
    4.3.3 Coding
    4.4 Quality assessment procedures
    5 General provisions for measurements and test methods
    5.1 General
    5.2 Standard atmospheric conditions for testing <\/td>\n<\/tr>\n
    32<\/td>\n5.3 Drying and recovery
    5.3.1 Drying
    5.3.2 Recovery
    5.4 Mounting (for surface mount thermistors only)
    5.4.1 General
    5.4.2 Printed wiring board and land pattern
    5.4.3 Mounting on board <\/td>\n<\/tr>\n
    34<\/td>\n6 Electrical tests and measurements
    6.1 Zero-power resistance
    6.1.1 General
    6.1.2 Measurement procedures
    6.1.3 Requirements
    6.2 B-value or resistance ratio
    6.2.1 General
    6.2.2 Requirements
    Figure 4 \u2013 Basic circuit for zero-power resistance measurement <\/td>\n<\/tr>\n
    35<\/td>\n6.3 Insulation resistance (for insulated types only)
    6.3.1 General
    6.3.2 Test methods
    Figure 5 \u2013 Example of Method 1 for testing the insulation resistance <\/td>\n<\/tr>\n
    36<\/td>\nFigure 6 \u2013 Example of Method 2 for testing the insulation resistance (1)
    Figure 7 \u2013 Example of Method 2 for testing the insulation resistance (2) <\/td>\n<\/tr>\n
    37<\/td>\nFigure 8 \u2013 Example of Method 3 for testing the insulation resistance
    Figure 9 \u2013 Example of Method 4 for testing the insulation resistance <\/td>\n<\/tr>\n
    38<\/td>\n6.3.3 Applied voltage
    6.3.4 Requirements
    6.4 Voltage proof (for insulated types only)
    6.4.1 General
    6.4.2 Test voltage
    6.4.3 Requirements
    6.5 Resistance\/temperature characteristic
    6.5.1 General
    6.5.2 Test methods
    6.5.3 Requirements <\/td>\n<\/tr>\n
    39<\/td>\n6.6 Dissipation factor (\u03b4)
    6.6.1 General
    6.6.2 Initial measurements
    6.6.3 Test methods
    Figure 10 \u2013 Example of test chamber <\/td>\n<\/tr>\n
    40<\/td>\n6.6.4 Requirements
    6.7 Thermal time constant by ambient temperature change (\u03c4a)
    6.7.1 The hot to cold thermal time constant for ambient temperature change
    Figure 11 \u2013 Dissipation factor measuring circuit <\/td>\n<\/tr>\n
    41<\/td>\n6.7.2 The cold to hot thermal time constant for ambient temperature change
    6.7.3 Final measurements and requirements <\/td>\n<\/tr>\n
    42<\/td>\n6.7.4 Requirements
    6.8 Thermal time constant by cooling after self-heating (\u03c4c)
    6.8.1 General
    6.8.2 Initial measurements
    6.8.3 Preconditioning <\/td>\n<\/tr>\n
    43<\/td>\n6.8.4 Test method
    6.8.5 Final measurements and requirements
    7 Mechanical test and measurements
    7.1 Visual examination and check of dimensions
    7.1.1 Visual examination
    Figure 12 \u2013 Thermal time constant measuring circuit <\/td>\n<\/tr>\n
    44<\/td>\n7.1.2 Dimensions
    7.2 Robustness of terminations (not applicable to surface mount thermistors)
    7.2.1 General
    7.2.2 Initial measurements
    7.2.3 Test methods
    7.2.4 Test Ua1 \u2013 Tensile <\/td>\n<\/tr>\n
    45<\/td>\n7.2.5 Test Ub \u2013 Bending (half the number of terminations)
    7.2.6 Test Uc \u2013 Torsion (remaining terminations)
    7.2.7 Final measurements and requirements
    7.3 Vibration
    7.3.1 General
    7.3.2 Initial measurements
    7.3.3 Test procedures
    Table 2 \u2013 Tensile force <\/td>\n<\/tr>\n
    46<\/td>\n7.3.4 Final inspection, measurements and requirements
    7.4 Shock
    7.4.1 General
    7.4.2 Initial measurements
    7.4.3 Mounting
    7.4.4 Test procedures
    7.4.5 Final inspection, measurements and requirements
    7.5 Free fall
    7.5.1 General
    7.5.2 Initial measurements <\/td>\n<\/tr>\n
    47<\/td>\n7.5.3 Test procedures
    7.5.4 Final inspection, measurements and requirements
    7.6 Shear (adhesion) test (for surface mount NTC thermistors only)
    7.6.1 General
    7.6.2 Initial measurements
    7.6.3 Test conditions
    7.6.4 Final inspection, measurements and requirements
    7.7 Substrate bending test (for surface mount NTC thermistors only)
    7.7.1 General
    7.7.2 Initial measurements
    7.7.3 Test procedures <\/td>\n<\/tr>\n
    48<\/td>\n7.7.4 Final inspection, measurements and requirements
    8 Environmental and climatic tests
    8.1 Rapid change of temperature
    8.1.1 General
    8.1.2 Initial measurements
    8.1.3 Test procedures
    8.1.4 Final inspection, measurements and requirements <\/td>\n<\/tr>\n
    49<\/td>\n8.2 Thermal shock
    8.2.1 General
    8.2.2 Initial measurements
    8.2.3 Test procedures
    8.2.4 Final inspection, measurements and requirements
    8.3 Cold
    8.3.1 General
    8.3.2 Initial measurements
    8.3.3 Test procedures <\/td>\n<\/tr>\n
    50<\/td>\n8.3.4 Final inspection, measurements and requirements
    8.4 Dry heat
    8.4.1 General
    8.4.2 Initial measurements
    8.4.3 Test procedures
    8.4.4 Final inspection, measurements and requirements <\/td>\n<\/tr>\n
    51<\/td>\n8.5 Damp heat, steady state
    8.5.1 General
    8.5.2 Initial measurements
    8.5.3 Test procedures
    8.5.4 Recovery
    8.5.5 Final inspection, measurements and requirements
    8.6 Endurance
    8.6.1 General <\/td>\n<\/tr>\n
    52<\/td>\n8.6.2 Endurance at room temperature with applied continuous maximum current (Imax25) (for inrush current-limiting thermistors only)
    Figure 13 \u2013 Endurance at room temperature with Imax25 evaluating circuit <\/td>\n<\/tr>\n
    53<\/td>\n8.6.3 Endurance at room temperature with applied cyclic maximum current (Imax25) (for inrush current-limiting thermistors only)
    Figure 14 \u2013 Endurance at room temperature with Imax25 evaluating circuit <\/td>\n<\/tr>\n
    54<\/td>\n8.6.4 Endurance at T3 and Pmax (for other than inrush current-limiting thermistors only) <\/td>\n<\/tr>\n
    55<\/td>\n8.6.5 Endurance at upper category temperature <\/td>\n<\/tr>\n
    56<\/td>\n8.6.6 Maximum permissible capacitance (for inrush current-limiting thermistors only) <\/td>\n<\/tr>\n
    57<\/td>\nFigure 15 \u2013 Maximum permissible capacitance test circuit (Method 1)
    Figure 16 \u2013 Maximum permissible capacitance test circuit (Method 2) <\/td>\n<\/tr>\n
    58<\/td>\n8.7 Salt mist
    8.7.1 General
    8.7.2 Initial measurements
    8.7.3 Test conditions
    8.7.4 Final inspection, measurements and requirements
    8.8 Sealing
    8.9 Composite temperature\/humidity cycle
    8.9.1 General
    8.9.2 Initial measurements <\/td>\n<\/tr>\n
    59<\/td>\n8.9.3 Test conditions
    8.9.4 Final inspection, measurements and requirements
    9 Tests related to component assembly
    9.1 Resistance to soldering heat
    9.1.1 General
    9.1.2 Preconditioning
    9.1.3 Initial measurements
    9.1.4 Test procedure
    9.1.5 Recovery <\/td>\n<\/tr>\n
    60<\/td>\n9.1.6 Final inspection, measurement and requirements
    9.2 Solderability
    9.2.1 General
    9.2.2 Initial measurements
    9.2.3 Test procedure
    9.2.4 Final inspection, measurements and requirements <\/td>\n<\/tr>\n
    61<\/td>\n9.3 Component solvent resistance
    9.3.1 General
    9.3.2 Initial measurements
    9.3.3 Test conditions
    9.3.4 Requirements
    9.4 Solvent resistance of marking
    9.4.1 General
    9.4.2 Initial measurements
    9.4.3 Test conditions
    9.4.4 Requirements <\/td>\n<\/tr>\n
    62<\/td>\nAnnex A (normative)Rules for the preparation of detail specifications fordirectly heated NTC thermistors for electronic equipment foruse within quality assessment systems
    A.1 Drafting
    A.2 Reference standard
    A.3 Circulation <\/td>\n<\/tr>\n
    63<\/td>\nAnnex B (informative)Typical examples of mountings for measurementsof directly heated thermistors
    Table B.1 \u2013 Recommended land dimensions <\/td>\n<\/tr>\n
    64<\/td>\nFigure B.1 \u2013 Mounting for measurements of surface mount thermistors <\/td>\n<\/tr>\n
    65<\/td>\nAnnex Q (informative)Quality assessment procedures
    Q.1 General
    Q.1.1 Scope of this annex <\/td>\n<\/tr>\n
    66<\/td>\nQ.1.2 Quality assessment definitions
    Q.1.3 Rework
    Q.1.4 Alternative test methods <\/td>\n<\/tr>\n
    67<\/td>\nQ.1.5 Certified test records of released lots
    Q.1.6 Unchecked parameters
    Q.1.7 Delayed delivery
    Q.1.8 Repair
    Q.1.9 Registration of approvals <\/td>\n<\/tr>\n
    68<\/td>\nQ.1.10 Manufacture outside the geographical limits
    Q.2 Qualification approval (QA) procedures
    Q.2.1 Eligibility for qualification approval
    Q.2.2 Application for qualification approval
    Q.2.3 Subcontracting
    Q.2.4 Test procedure for the initial product qualification approval
    Q.2.5 Granting of qualification approval
    Q.2.6 Maintenance of qualification approval <\/td>\n<\/tr>\n
    69<\/td>\nQ.2.7 Quality conformance inspection
    Q.3 Capability approval (CA) procedures
    Q.3.1 General
    Q.3.2 Eligibility for capability approval
    Q.3.3 Application for capability approval <\/td>\n<\/tr>\n
    70<\/td>\nQ.3.4 Subcontracting
    Q.3.5 Description of the capability
    Q.3.6 Demonstration and verification of capability
    Q.3.7 Granting of capability approval
    Q.3.8 Maintenance of capability approval
    Q.3.9 Quality conformance inspection <\/td>\n<\/tr>\n
    71<\/td>\nQ.4 Technology approval (TA) procedure
    Q.4.1 General
    Q.4.2 Eligibility for technology approval
    Q.4.3 Application of technology approval
    Q.4.4 Subcontracting
    Q.4.5 Description of technology
    Q.4.6 Demonstration and verification of the technology
    Q.4.7 Granting of technology approval
    Q.4.8 Maintenance of technology approval <\/td>\n<\/tr>\n
    72<\/td>\nQ.4.9 Quality conformance inspection
    Q.5 Interpretation of sampling plans and procedures as described in IEC 60410 for use within quality assessment systems
    Q.6 Rules for the preparation of detail specifications for NTC thermistors for electronic equipment for use within quality assessment systems
    Q.6.1 Drafting
    Q.6.2 Reference standard <\/td>\n<\/tr>\n
    73<\/td>\nQ.7 Layout of the first page of a PCP\/CQC specification <\/td>\n<\/tr>\n
    74<\/td>\nQ.8 Requirements for capability approval test report
    Q.8.1 General
    Q.8.2 Requirements
    Q.8.3 Summary of test information (for each CQC)
    Q.8.4 Measurement record
    Q.9 Guidance for the extension of endurance tests on fixed thermistor
    Q.9.1 Overview <\/td>\n<\/tr>\n
    75<\/td>\nQ.9.2 Guidelines <\/td>\n<\/tr>\n
    76<\/td>\nAnnex X (informative)Cross-references to IEC 60539-1:2016 <\/td>\n<\/tr>\n
    78<\/td>\nBibliography <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":"

    Directly heated negative temperature coefficient thermistors – Generic specification<\/b><\/p>\n\n\n\n\n
    Published By<\/td>\nPublication Date<\/td>\nNumber of Pages<\/td>\n<\/tr>\n
    BSI<\/b><\/a><\/td>\n2023<\/td>\n80<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"featured_media":423010,"template":"","meta":{"rank_math_lock_modified_date":false,"ep_exclude_from_search":false},"product_cat":[560,2641],"product_tag":[],"class_list":{"0":"post-422999","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-31-040-30","7":"product_cat-bsi","9":"first","10":"instock","11":"sold-individually","12":"shipping-taxable","13":"purchasable","14":"product-type-simple"},"_links":{"self":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product\/422999","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/types\/product"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media\/423010"}],"wp:attachment":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media?parent=422999"}],"wp:term":[{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_cat?post=422999"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_tag?post=422999"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}