IEC 60393-6:2003

Potentiometers for use in electronic equipment - Part 6: Sectional specification: Surface mount preset potentiometers

prescribes preferred ratings and characteristics and selects appropriate quality assessment procedures, tests and measuring methods from IEC 60393-1 and gives general performance requirements for this type of potentiometer.

General Information

• Status: Published
• Publication Date: 15-May-2003
• ICS: 31.040.20 - Potentiometers, variable resistors
• Technical Committee: TC 40 - Capacitors and resistors for electronic equipment
• Drafting Committee: MT 60393-6 - TC 40/MT 60393-6
• Current Stage: DELPUB - Deleted Publication
• Completion Date: 14-Dec-2015

Relations

• Revised: IEC 60393-6:2015 - Potentiometers for use in electronic equipment - Part 6: Sectional specification - Surface mount preset potentiometers
• Effective Date: 05-Sep-2023

Standards Content (Sample)

INTERNATIONAL IEC
STANDARD
60393-6
First edition
2003-05
Potentiometers for use
in electronic equipment –
Part 6:
Sectional specification:
Surface mount preset potentiometers
Reference number
Publication numbering
As from 1 January 1997 all IEC publications are issued with a designation in the
60000 series. For example, IEC 34-1 is now referred to as IEC 60034-1.
Consolidated editions
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edition numbers 1.0, 1.1 and 1.2 refer, respectively, to the base publication, the
base publication incorporating amendment 1 and the base publication incorporating
amendments 1 and 2.
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INTERNATIONAL IEC
STANDARD
60393-6
First edition
2003-05
Potentiometers for use
in electronic equipment –
Part 6:
Sectional specification:
Surface mount preset potentiometers
 IEC 2003  Copyright - all rights reserved
No part of this publication may be reproduced or utilized in any form or by any means, electronic or
mechanical, including photocopying and microfilm, without permission in writing from the publisher.
International Electrotechnical Commission, 3, rue de Varembé, PO Box 131, CH-1211 Geneva 20, Switzerland
Telephone: [phone] Telefax: [phone] E-mail: [e-mail]  Web: www.iec.ch
PRICE CODE
Commission Electrotechnique Internationale
U
International Electrotechnical Commission
Международная Электротехническая Комиссия
For price, see current catalogue

– 2 – 60393-6  IEC:2003(E)
CONTENTS
FOREWORD . 3
1 General . 4
1.1 Scope . 4
1.2 Object. 4
1.3 Normative references . 4
1.4 Information to be given in a Detail Specification. 5
2 Preferred ratings, characteristics and test severities . 9
2.1 Preferred characteristics. 9
2.2 Preferred values of ratings.14
2.3 Preferred test severities.16
3 Quality assessment procedures .17
3.1 Structurally similar components .17
3.2 Qualification approval .17
3.3 Quality conformance inspection .25
3.4 Delayed delivery.26
Figure 1 – Suitable substrate for mechanical and electrical tests (may not be suitable
for impedance measurements) . 7
Figure 2 – Suitable substrate for electrical tests. 8
Figure 3 – Rated dissipation curve .15
Figure 4 – Rated dissipation curve with larger area of operation .15
Table 1 – Temperature coefficients and temperature characteristics of resistance.10
Table 2 – Limits for change in resistance and output ratio .11
Table 3 – Fixed sample size test schedule for qualification approval – Assessment
level E.19
Table 4 – Assessment level corresponding to inspection subgroup.25
Table 5 – Assessment level corresponding to inspection subgroup.26

60393-6  IEC:2003(E) – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
POTENTIOMETERS FOR USE IN ELECTRONIC EQUIPMENT –
Part 6: Sectional specification:
Surface mount preset potentiometers
FOREWORD
1) The IEC (International Electrotechnical Commission) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of the IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, the IEC publishes International Standards. Their preparation is
entrusted to technical committees; any IEC National Committee interested in the subject dealt with may
participate in this preparatory work. International, governmental and non-governmental organizations liaising
with the IEC also participate in this preparation. The IEC collaborates closely with the International
Organization for Standardization (ISO) in accordance with conditions determined by agreement between the
two organizations.
2) The formal decisions or agreements of the IEC on technical matters express, as nearly as possible, an
international consensus of opinion on the relevant subjects since each technical committee has representation
from all interested National Committees.
3) The documents produced have the form of recommendations for international use and are published in the form
of standards, technical Specifications, technical reports or guides and they are accepted by the National
Committees in that sense.
4) In order to promote international unification, IEC National Committees undertake to apply IEC International
Standards transparently to the maximum extent possible in their national and regional standards. Any
divergence between the IEC Standard and the corresponding national or regional standard shall be clearly
indicated in the latter.
5) The IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with one of its standards.
6) Attention is drawn to the possibility that some of the elements of this International Standard may be the subject
of patent rights. The IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 60393-6 has been prepared by IEC technical committee 40:
Capacitors and resistors for electronic equipment.
The text of this standard is based on the following documents:
FDIS Report on voting
40/1288/FDIS 40/1324/RVD
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
This Sectional Specification is to be used in conjunction with IEC 60393-1:1989.
The committee has decided that the contents of this publication will remain unchanged
until 2008. At this date, the publication will be
• reconfirmed;
• withdrawn;
• replaced by a revised edition, or
• amended
A bilingual version of this publication may be issued at a later date.

– 4 – 60393-6  IEC:2003(E)
POTENTIOMETERS FOR USE IN ELECTRONIC EQUIPMENT –
Part 6: Sectional specification:
Surface mount preset potentiometers
1 General
1.1 Scope
This International Standard is applicable to surface mount preset potentiometers for use in
electronic equipment.
1.2 Object
The object of this standard is to prescribe preferred ratings and characteristics and to
select the appropriate quality assessment procedures, tests and measuring methods from
IEC 60393-1 and to give general performance requirements for this type of potentiometer.
Test severities and requirements prescribed in Detail Specifications referring to this Sectional
Specification shall be of equal or higher performance level, lower performance levels are not
permitted.
1.3 Normative references
The following referenced documents are indispensable for the application of this document.
For dated references, only the edition cited applies. For undated references, the latest edition
of the referenced document (including any amendments) applies.
IEC 60063:1963, Preferred number series for resistors and capacitors
Amendment 1 (1967)
Amendment 2 (1977)
IEC 60068-1, Environmental testing. Part 1: General and guidance
IEC 60068-2-20, Environmental testing. Part 2: Tests. Test T: Soldering
IEC 60068-2-21, Environmental testing – Part 2-21: Tests – Test U: Robustness of termin-
ations and integral mounting devices
IEC 60068-2-45, Environmental testing. Part 2: Tests. Test XA and guidance: Immersion in
cleaning solvents
IEC 60068-2-58, 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)
IEC 60393-1:1989, Potentiometers for use in electronic equipment – Part 1: Generic
Specification
Amendment 1 (1992)
IEC 60410:1973, Sampling plans and procedures for inspection by attributes

60393-6  IEC:2003(E) – 5 –
IEC QC 001001:2000, IEC Quality Assessment System for Electronic Components (IECQ) –
Basic rules
IEC QC 001002-3:1998, IEC Quality Assessment System for Electronic Components (IECQ) –
Rules of procedure – Part 3: Approval procedures
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 1.8 of the Detail
Specification and indicated in the test schedules, for example by an asterisk.
NOTE The information given in 1.4.1 and 1.4.3 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
The Detail Specification shall incorporate an illustration of the surface mount preset poten-
tiometer as aid to easy recognition and for comparison of the surface mount potentiometer
with others.
Dimensions and their associated tolerances, which affect interchangeability and mounting,
shall be given in the Detail Specification. All dimensions shall be stated in millimetres.
Normally the numerical values shall be given for the length, width and thickness of the body.
Where space is insufficient to show the detail dimensions required for inspection purposes,
such dimensions shall appear on the drawing forming an annex to the Detail Specification.
Recommended land patterns shall be given in Detail Specification.
When the outline drawing is other than described above, the Detail Specification shall state
such dimensional information as will adequately describe the surface mount potentiometer.
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 the
following Subclauses , unless otherwise specified.
1.4.2.1 Surface mount potentiometers shall be mounted on a suitable substrate; the method
of mounting will depend on the potentiometer construction. The Detail Specification shall
indicate which material is to be used for electrical measurements.
The substrate shall have metallized land areas of proper spacing to permit mounting of
surface mount potentiometers, and it shall provide electrical connection to the surface mount
potentiometer terminals. The details shall be specified in the Detail Specification.
___________
The text of 1.4.2 and its Subclauses will be integrated in a future edition of IEC 60393-1.

– 6 – 60393-6  IEC:2003(E)
Examples of test substrates for mechanical and electrical tests are shown in Figures 1 and 2
respectively. If another mounting method applies, the method should be clearly described in
the Detail Specification.
1.4.2.2 When the Detail Specification specifies wave soldering, a suitable glue, details of
which may be specified in the Detail Specification, shall be used to fasten the component to
the substrate before soldering is performed.
Small dots of glue shall be applied between the conductors of the substrate by means of a
suitable device securing repeatable results.
The surface mount potentiometers shall be placed on the dots using tweezers. In order to
ensure that no glue is applied to the conductors
...