IEC 60191-1:2007

INTERNATIONAL IEC
STANDARD 60191-1
Second edition
2007-04
Mechanical standardization of semiconductor
devices –
Part 1:
General rules for the preparation of outline
drawings of discrete devices
Reference number
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INTERNATIONAL IEC
STANDARD 60191-1
Second edition
2007-04
Mechanical standardization of semiconductor
devices –
Part 1:
General rules for the preparation of outline
drawings of discrete devices
PRICE CODE
Commission Electrotechnique Internationale W
International Electrotechnical Commission
МеждународнаяЭлектротехническаяКомиссия
For price, see current catalogue

– 2 – 60191-1 © IEC:2007(E)
CONTENTS
FOREWORD.4

1 Scope and object.6

2 Normative references .6

3 Terms and definitions .6

4 General rules for all drawings .8

4.1 Drawing layout .8
4.2 Dimensions and tolerances .8
4.3 Methods for locating the datum .10
4.4 Numbering of terminals .10
5 Additional rules .12
5.1 Rules for device and case outline drawings .12
5.2 Rules to specify the dimensions and positions of terminals.12
5.3 Rules for gauge drawings.13
6 Inter-conversion of inch and millimetre dimensions and rules for rounding off.13
7 Rules for coding .14

Annex A (informative) Reference letter symbols.15
Annex B (normative) Standardization philosophy .18
Annex C (informative) Rules to specify the dimensions and positions of terminals on a
base drawing .23
Annex D (normative) General philosophy of flat base devices .30
Annex E (informative) Examples of semiconductor device drawing .32
Annex F (informative) Former rules for rounding off .36
Annex G (informative) Former rules for coding.38

Bibliography.39

Figure 1 – Numbering of terminals of lozenge – shaped bases.11
Figure 2 – System to indicate the dimensions of the terminals .13

Figure B.1 − Example of rigid lug device .21
Figure B.2 − Example of flexible terminal device .22
Figure C.1 – Circular base outline with no tab.27
Figure C.2 – Tolerances of terminals .27
Figure C.3 – Gauge for a circular base outline with no tab .28
Figure C.4 – Circular base outline with tab.29
Figure C.5 – Gauge for a circular base outline with tab .29
Figure D.1 − Example of flat base outline.31
Figure E.1 − Long form package .32
Figure E.2 − 3 types of post/stud mount packages .32
Figure E.3 − 2 types of cylindric packages .33
Figure E.4 − Oval package, terminals in line .34

60191-1 © IEC:2007(E) – 3 –
Figure E.5 − Cylindric package with different terminations .34

Figure E.6 − Flange mount package.34

Figure E.7 − Disk button package with 3 terminations .35

Figure E.8 − Special shape for bolt-fixture .35

Table A.1 – Dimensions of reference letter symbols.15

– 4 – 60191-1 © IEC:2007(E)
INTERNATIONAL ELECTROTECHNICAL COMMISSION

____________
MECHANICAL STANDARDIZATION OF SEMICONDUCTOR DEVICES –

Part 1: General rules for the preparation of outline drawings

of discrete devices
FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of 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, IEC publishes International Standards, Technical Specifications,
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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 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 IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
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5) IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with an IEC Publication.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
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8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 60191-1 has been prepared by subcommittee 47D: Mechanical
standardization for semiconductor devices, of IEC technical committee 47: Semiconductor
devices.
This second edition cancels and replaces the first edition published in 1966 together with
supplements 60191-1A:1969, 60191-1B:1970 and 60191-1C:1974 and constitutes a technical
revision. The main changes from the previous edition are as follows:
– requirement added for SI-dimensions for new drawings to be published;
– former rules concerning inch-dimensions are given in an informative annex;
– former rules for coding are given in an informative annex;
– incorporation of the supplements;
– updating of references;
– restructuring and renumbering.

60191-1 © IEC:2007(E) – 5 –
The text of this standard is based on the following documents:

FDIS Report on voting
47D/678/FDIS 47D/682/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.

The IEC 60191 series, published under the general title Mechanical standardization of
semiconductor devices, comprises the following parts:
Part 1: General rules for the preparation of outline drawings of discrete devices
Part 2: Dimensions
Part 3: General rules for the preparation of outline drawings of integrated circuits
Part 4: Coding system and classification into forms of package outlines for semiconductor
device packages
Part 5: Recommendations applying to integrated circuit packages using tape automated
bonding (TAB)
Part 6: General rules for the preparation of outline drawings of surface mounted
semiconductor device packages
The committee has decided that the contents of this publication will remain unchanged until
the maintenance result date indicated on the IEC web site under "http://webstore.iec.ch" in
the data related to the specific publication. 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.

– 6 – 60191-1 © IEC:2007(E)
MECHANICAL STANDARDIZATION OF SEMICONDUCTOR DEVICES –

Part 1: General rules for the preparation of outline drawings

of discrete devices
1 Scope and object
This part of IEC 60191 gives guidelines on the preparation of outline drawings of discrete
devices.
NOTE For preparation of outline drawings of surface mounted discrete devices, IEC 60191-6 should be referred to
as well.
The primary object of these drawings is to indicate the space which should be allowed for
devices in an equipment, together with other dimensional characteristics required to ensure
mechanical interchangeability.
It should be noted that complete interchangeability involves other considerations such as the
electrical and thermal characteristics of the semiconductor devices concerned.
The international standardization represented by these drawings therefore encourages the
manufacturers of devices to comply with the tolerances shown on the drawings in order to
extend their range of customers internationally. It also gives equipment designers an
assurance of mechanical interch
...