IEC 60938-1-2021 pdf free download – Fixed inductors for electromagnetic interference suppression – Part 1: Generic specification.
lf not stated otherwise in the detail specification,a linear de-rating of applied current overambient temperature is assumed up to zero current at the upper category temperature.
4.3lnformation to be given in a detail specification
4.3.1 General
Detail specifications shall be derived from the relevant blank detail specification.
Detail specifications shall not specify requirements inferior to those of the generic or sectionalspecification. When more severe requirements are included, they shall be listed separately.
4.3.2Outline drawing and dimensions
There shall be an illustration of the inductor as an aid to easy recognition and for comparison of the inductor with others. Dimensions and their associated tolerances,which affectinterchangeabilityand mounting，shall be indicated on the drawing. All dimensions shall bestated in millimetres.
The numerical values shall be given for the length of the body, the width and height of the body
or for cylindrical types, the body diameter，and the length and diameter of the terminations.When necessary, for example when a number of items (inductance values/ voltage ranges) are
covered by a detail specification,the dimensions and their associated tolerances shall beplaced in a table below the drawing.
When the configuration is other than that described above,the detail specification shall statesuch dimensional informationto describe the inductor adequately. When the inductor is notdesigned for use on printed boards, this shall be clearly stated in the detail specification.
4.3.3Mounting
The detail specification shall specify the method of mounting to be recommended for normaluse and the method that is mandatory for the application of the vibration and shock tests. The
design of the inductor can be such that special mounting fixtures are required in its use. In thiscase, the detail specification shall describe the mounting fixtures and they shall be used in theapplication of shock and vibration tests. The specified heat sink shall be used in the applicationof the endurance test.
4.3.4Ratings and characteristics
The ratings and characteristics shall be in accordance with the relevant clauses of thisspecification. Additional characteristics may be listed when they are considered necessary tospecify adequately the inductor for design and application purposes.
4.4 Insulated inductors
Insulated inductors may be built either with a housing, or with isolated wires whose isolationprovides basic insulation, e.g.TIW,FIW-wires, PVC-isolated wires, wires in insulation sleeves
or the like. The isolated wires or the insulating materials used shall be in accordance withrelevant IEC standards.
Instead of fulfilling requirements for clearance and creepage inside inductors, the windings maybe insulated by potting or insulation sleeves or the windings may be built from wires with basicinsulation like Tiw, FIW,PvC-isolated wires or the like.
Insulation materials used between terminals and windings，for housing or potting shall becertified to a minimum rating of v-2,VTM-2 or HF-2 in accordancewith IEC 60695-11-10 and IEC 60695-11-20(or UL 94) at the appropriate minimum thickness, which is determined by thesmallest thickness of insulation in direct contact with a conductor.
4.5 Marking
Necessary marking in accordance with the relevant specifications shall be prescribed in thedetail specification. Deviations from these requirements shall be listed separately and thereason for them shall be stated specifically in the detail specification.
The sectional specification shall indicate the identification criteria and other information to beshown on the inductors and its packaging. The order of priority for marking small componentsshall be specified.When coding is used for inductance values, tolerance or date of manufacture,the method shall be selected from those given in lEC 60062.IEC 60938-1 pdf download.