• NF EN 60539-2 : 2005 AMD 1 2011

    Superseded A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.

    DIRECTLY HEATED NEGATIVE TEMPERATURE COEFFICIENT THERMISTORS - PART 2: SECTIONAL SPECIFICATION - SURFACE MOUNT NEGATIVE TEMPERATURE COEFFICIENT THERMISTORS

    Available format(s): 

    Superseded date:  05-10-2021

    Language(s): 

    Published date:  13-01-2013

    Publisher:  Association Francaise de Normalisation

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    Table of Contents - (Show below) - (Hide below)

    1 General
       1.1 Scope
       1.2 Normative references
       1.3 Information to be given in a detail specification
           1.3.1 Outline drawing and dimensions
           1.3.2 Mounting
           1.3.3 Ratings and characteristics
       1.4 Terminology
    2 Preferred ratings and characteristics
       2.1 Tolerances on rated zero-power resistance
       2.2 Climatic categories
    3 Quality assessment procedures
       3.1 Primary stage of manufacture
       3.2 Structurally similar components
       3.3 Qualification approval procedures
           3.3.1 The manufacturer shall comply with 3.4 of IEC 60539-1
       3.4 Quality conformance inspection
           3.4.1 Qualification approval on the basis of the fixed
                 sample size procedure
       3.5 Quality conformance inspection
           3.5.1 Formation of inspection lots
           3.5.2 Test schedule
           3.5.3 Delayed delivery
           3.5.4 Assessment level
    4 Test and measurement procedures
       4.1 Mounting
       4.2 Drying and recovery
           4.2.1 Drying
           4.2.2 Recovery
       4.3 Visual examination and check of dimensions
           4.3.1 Visual examination
           4.3.2 Requirements
           4.3.3 Marking
           4.3.4 Dimensions
       4.4 Electrical tests
           4.4.1 Zero-power resistance
           4.4.2 B-value or resistance ratio
           4.4.3 Resistance/temperature characteristic
       4.5 Thermal tests
           4.5.1 Dissipation factor (delta)
           4.5.2 Thermal time constant by cooling after self-heating (Tau[c])
       4.6 Resistance to soldering heat
           4.6.1 Initial measurement
           4.6.2 Test conditions
           4.6.3 Recovery
           4.6.4 Final inspection, measurements and requirements
      4.7 Solderability
           4.7.1 Test conditions
           4.7.2 Recovery
           4.7.3 Final inspection, measurements and requirements
      4.8 Rapid change of temperature
      4.9 Thermal shock
      4.10 Climatic sequence
           4.10.1 Initial measurements
           4.10.2 Dry heat
           4.10.3 Damp heat (cyclic), first cycle
           4.10.4 Cold
           4.10.5 Damp heat (cyclic), remaining cycles
           4.10.6 Final measurements
      4.11 Damp heat, steady state
      4.12 Endurance
           4.12.1 Endurance at Theta[3] and P[max.]
           4.12.2 Endurance at upper category temperature
      4.13 Shear (adhesion) test
      4.14 Substrate bending test
      4.15 Component solvent resistance
      4.16 Solvent resistance of marking
    Annex A (normative) Guide for the specification and coding of
            dimensions of surface mount negative temperature
            coefficient thermistors
    Annex ZA (normative) Normative references to international
             publications with their corresponding European
             publications

    Abstract - (Show below) - (Hide below)

    Applies to surface mount directly heated negative temperature coefficient thermistors, typically made from transition metal oxide materials with semiconducting properties. These thermistors have metallized connecting pads or soldering strips and are intended to be mounted directly on to substrates for hybrid circuits or on to printed boards.

    General Product Information - (Show below) - (Hide below)

    Development Note Indice de classement: C93-272-2. (02/2005)
    Document Type Standard
    Publisher Association Francaise de Normalisation
    Status Superseded
    Superseded By

    Standards Referencing This Book - (Show below) - (Hide below)

    IEC 60068-2-58:2015+AMD1:2017 CSV Environmental testing - Part 2-58: Tests - Test Td: Test methods for solderability, resistance to dissolution of metallization and to soldering heat of surface mounting devices (SMD)
    NF EN 60068-2-2 : 2007 ENVIRONMENTAL TESTING - PART 2-2: TESTS - TESTS B: DRY HEAT
    IEC 60410:1973 Sampling plans and procedures for inspection by attributes
    NF EN 60068 2-14 : 2009 ENVIRONMENTAL TESTING - PART 2-14: TESTS - TEST N: CHANGE OF TEMPERATURE
    IEC 60068-2-2:2007 Environmental testing - Part 2-2: Tests - Test B: Dry heat
    NF EN 60068-2-78 : 2013 ENVIRONMENTAL TESTING - PART 2-78: TESTS - TEST CAB: DAMP HEAT, STEADY STATE
    NF EN 60068 2-30 : 2006 ENVIRONMENTAL TESTING - PART 2-30: TESTS - TEST DB AND GUIDANCE: DAMP HEAT, CYCLIC (12 H + 12 H CYCLE)
    IEC 60068-2-14:2009 Environmental testing - Part 2-14: Tests - Test N: Change of temperature
    IEC 60539-1:2016 Directly heated negative temperature coefficient thermistors - Part 1: Generic specification
    IEC 60068-2-30:2005 Environmental testing - Part 2-30: Tests - Test Db: Damp heat, cyclic (12 h + 12 h cycle)
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