IEC 60384-22 pdf download.Fixed capacitors for use in electronic equipment – Part 22: Sectional specification – Fixed surface mount multilayer capacitors of ceramic dielectric, Class 2
1 General
1 .1 Scope
This part of IEC 60384 is applicable to fixed unencapsulated surface mount multilayer capacitors of ceramic dielectric, Class 2, for use in electronic equipment. These capacitors have metallized connecting pads or soldering strips and are intended to be mounted on printed boards, or directly onto substrates for hybrid circuits. Capacitors for electromagnetic interference suppression are not included, but are covered by IEC 60384-1 4.
1 .2 Object
The object of this standard is to prescribe preferred ratings and characteristics and to select from IEC 60384-1 the appropriate quality assessment procedures, tests and measuring methods and to give general performance requirements for this type of capacitor. Test severities and requirements prescribed in detail specifications referring to this sectional specification should be of equal or higher performance level, lower performance levels are not permitted.
1 .4 Information to be given in a detail specification
Detail specifications shall be derived from the relevant blank detail specification.Detail specifications shall not specify requirements inferior to those of the generic, sectional or blank detail specification. When more severe requirements are included, they shall be listed in 1 .9 of the detail specification and indicated in the test schedules, for example by an asterisk. NOTE The information given in 1 .4.1 may for convenience, be presented in tabular form. The following information shall be given in each detail specification and the values quoted shall preferably be selected from those given in the appropriate clause of this sectional specification. 1 .4.1 Outline drawing and dimensions There shall be an illustration of the capacitors as an aid to easy recognition and for comparison of the capacitors with others. Dimensions and their associated tolerances, which affect interchangeability and mounting, shall be given in the detail specification. All dimensions shall preferably be stated in millimetres, however, when the original dimensions are given in inches, the converted metric dimensions in millimetres shall be added. Normally the numerical values shall be given for the length, width and height of the body. When necessary, for example when a number of items (sizes and capacitance/voltage ranges) are covered by a detail specification, the dimensions and their associated tolerances shall be placed in a table below the drawing. When the configuration is other than described above, the detail specification shall state such dimensional information as will adequately describe the capacitors. 1 .4.2 Mounting The detail specification shall give guidance on methods of mounting for normal use. Mounting for test and measurement purposes (when required) shall be in accordance with 4.3 of this sectional specification. 1 .4.3 Rating and characteristics The ratings and characteristics shall be in accordance with the relevant clauses of this specification, together with the following.1 .4.3.1 Nominal capacitance range See 2.2.4.1 . NOTE When products approved to the detail specification have different ranges, the following statement should be added: “The range of capacitance values available in each voltage range is given in the register of approvals, available for example on the website www.iecq.org”. 1 .4.3.2 Particular characteristics Additional characteristics may be listed, when they are considered necessary to specify adequately the component for design and application purposes. 1 .4.3.3 Soldering The detail specification shall prescribe the test methods, severities and requirements applicable for the solderability and the resistance to soldering heat tests.1 .4.4 Marking The detail specification shall specify the content of the marking on the capacitor and on the package. Deviations from 1 .6 of this sectional specification shall be specifically stated.
1 .5 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 60384-1 , as well as the following apply. 1 .5.1 surface mount capacitor capacitor whose small dimensions and nature or shape of terminations make it suitable for surface mounting in hybrid circuits and on printed boards 1 .5.2 fixed capacitors, ceramic dielectric, Class 2 capacitor which has a dielectric with a high permittivity and is suitable for by-pass and coupling applications or for frequency discriminating circuits where low losses and high stability of capacitance are not of major importance NOTE The ceramic dielectric is characterized by a non linear change of capacitance over the category temperature range (see Table 3). 1 .5.3 subclass maximum percentage change of capacitance within the category temperature range with respect to the capacitance at 20 °C NOTE The subclass may be expressed in code form (see Table 3). 1 .5.4 category temperature range range of ambient temperatures for which the capacitor has been designed to operate continuously; this is given by the lower and upper category temperature 1 .5.5 rated temperature T R maximum ambient temperature at which the rated voltage may be continuously applied 1 .5.6 rated d.c. voltage U R maximum d.c. voltage which may be applied continuously to a capacitor at any temperature between the lower category temperature and the rated temperature NOTE Maximum d.c. voltage is the sum of the d.c. voltage and peak a.c. voltage or peak pulse voltage applied to the capacitor. 1 .5.7 category voltage U C maximum voltage which may be applied continuously to a capacitor at its upper category temperature
IEC 60384-22 pdf download
