IEC 60122-4:2019

IEC 60122-4 ®
Edition 1.0 2019-01
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Quartz crystal units of assessed quality –
Part 4: Crystal units with thermistors

Résonateurs à quartz sous assurance de la qualité –
Partie 4: Résonateurs à quartz équipés de thermistances

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IEC 60122-4 ®
Edition 1.0 2019-01
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Quartz crystal units of assessed quality –

Part 4: Crystal units with thermistors

Résonateurs à quartz sous assurance de la qualité –

Partie 4: Résonateurs à quartz équipés de thermistances

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 31.140 ISBN 978-2-8322-6457-7

– 2 – IEC 60122-4:2019 © IEC 2019
CONTENTS
FOREWORD . 3
1 Scope . 5
2 Normative references . 5
3 Terms, definitions, units and symbols . 6
3.1 Terms and definitions . 6
3.2 Units and symbols. 6
4 Specifications . 6
4.1 General . 6
4.2 Structure of crystal units with thermistors . 7
4.3 Handling of the thermistor . 7
4.4 Shipping requirements . 7
5 Delivery conditions . 8
6 Quality and reliability . 8
Annex A (informative) Effect of frequency stability using crystal units with thermistors . 9
A.1 Object . 9
A.2 Comparison of conventional crystal units with crystal units with thermistors . 9
A.3 Verification test of crystal units with thermistors . 10
A.3.1 Test condition . 10
A.3.2 Test result . 11
A.4 Example of crystal units with thermistors . 12
A.4.1 Structure . 12
A.4.2 Terminal functions . 13
Bibliography . 14

Figure 1 – Block diagrams of the quartz crystal units . 7
Figure A.1 – Conventional crystal oscillator with thermistor . 9
Figure A.2 – Conceptual diagram for crystal units with thermistors . 10
Figure A.3 – Test condition . 11
Figure A.4 – Test result . 12
Figure A.5 – Crystal units with thermistors inside enclosure (side view) . 13
Figure A.6 – Crystal units with thermistors outside enclosure (side view) . 13
Figure A.7 – Typical example of crystal units with thermistors – Terminal functions . 13

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
QUARTZ CRYSTAL UNITS OF ASSESSED QUALITY –

Part 4: Crystal units with thermistors

FOREWORD
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International Standard IEC 60122-4 has been prepared by IEC technical committee TC 49:
Piezoelectric, dielectric and electrostatic devices and associated materials for frequency
control, selection and detection.
The text of this International Standard is based on the following documents:
CDV Report on voting
49/1281/CDV 49/1291/RVC
Full information on the voting for the approval of this International Standard can be found in
the report on voting indicated in the above table.
This document has been drafted in accordance with the ISO/IEC Directives, Part 2.
A list of all parts in the IEC 60122 series, published under the general title Quartz crystal units
of assessed quality, can be found on the IEC website.

– 4 – IEC 60122-4:2019 © IEC 2019
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QUARTZ CRYSTAL UNITS OF
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