IEC 63171-2021 Connectors for electrical and electronic equipment – Shielded or unshielded free and fixed connectors for balanced single-pair data transmission with current-carrying capacity – General requirements and tests.
4 Common features and typical connector pair
This document does not describe a specific mating interface. Detail specifications of mating interfaces complying with this document can be found in the family of detail specification standards IEC 631 71 -X (type X).
Conformance to the test schedules shall ensure the reliability of all performance parameters, including transmission parameters, over the range of operating climatic conditions.
5.2 Pin assignment
For those specifications where pin assignment is relevant, the pin assignment shall be specified as shown in Figure 2, unless otherwise specified. For those connector interfaces foreseeing multiple instances of the same 2-way interface within the same connector body, the pin assignment shall be specified for each of such individual 2-way interfaces.
5.3 Classification into climatic category
The temperature range and climatic category shall be compatible with ISO/IEC 1 1 801 -1 classification of an M 1 I 1 C 1 E 1 environment.
The category is indicated by a series of three groups of digits separated by oblique strokes corresponding respectively to the temperature in the cold test and that in the dry heat test, and the number of days of exposure to damp heat (steady state) the components will withstand, as follows:
First set: two digits denoting the minimum ambient temperature of operation (cold test). Where the temperature requires the use of only one digit, it shall be prefixed by the figure “0” for a negative temperature or the symbol “+” for a positive temperature to make up the two-character group.
Second set: three digits denoting the maximum ambient temperature of operation (dry heat test). Where the temperature requires the use of only two digits, they shall be prefixed by the figure “0” to make up the three-digit group.
Third set: two digits denoting the number of days of the damp heat, steady-state test (Test Ca). Where the duration requires the use of only one digit, it shall be prefixed by the figure “0” to make up the two-digit group. The figures “00” shall be used to indicate that the component is not required to be exposed to damp heat (steady state).
In order to belong to a given category, components shall comply with the requirements of the relevant specification when subjected to the whole set of tests prescribed for their category.
5.4 Electrical characteristics
5.4.1 Creepage and clearance distances
The permissible operating voltages depend on the application and the specified safety requirements.
Although insulation coordination is not required for safety aspects by the connector covered in this document and in the relevant detail product specification, it is still required for electrical functional requirements.
In general, for minimum values of clearances and creepage distances, IEC 60664-1 shall apply, based on the assigned voltage rating 50 V AC and 60 V DC.
NOTE As indicated in IEC 60664-1 , IEC TR 63040 provides an alternative and more precise dimensioning procedure for clearances equal to or less than 2 mm.
The creepage and clearance distances given in the relevant detail product specification apply for mated connectors.
The creepage and clearance distances that cover performance requirements in IEC 60664-1 may be reduced, based on IEC TR 63040.
Furthermore, in practice, based on the conductive pattern of the printed board or the wiring used, reductions in creepage or clearance distances are permitted.IEC 63171 pdf download.