Overview
IEC 60679-3:2012 is an international standard published by the International Electrotechnical Commission (IEC) that specifies standard outlines and lead connections for quartz crystal controlled oscillators of assessed quality. This third edition, released in 2012, focuses on quartz crystal oscillators housed in lead enclosures. It defines the outline dimensions and lead configurations necessary to ensure mechanical interchangeability and reliable electrical performance.
The standard provides a framework to harmonize design aspects of these oscillators, promoting consistency and interoperability across manufacturers and applications. Key updates in this version include deletion of certain enclosure types (CO 01, CO 07, CO 10, CO 17, CO 18) and addition of new enclosure types and pin layouts (including CO 40, CO 41, CO 42, and CO 43), resulting in a total of 15 recognized enclosure types.
Key Topics
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Outline Dimensions
IEC 60679-3:2012 specifies precise outline dimensions of quartz crystal oscillator enclosures, including maximum values for envelope size (length, width, height) and lead dimensions in millimeters. These standardized outlines ensure mechanical compatibility among components in electronic assemblies.
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Lead Connections and Terminations
The standard provides detailed lead (terminal) configurations for soldering or plug-in applications, including minimum, nominal, and maximum dimensions for lead length, spacing, and cross-sectional size. A normative annex (Annex A) includes lead connections for oscillator types from CO 02 to CO 43, enabling designers to identify and use correct pin layouts.
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Standardized Designation System
Each oscillator enclosure is identified by a type code (e.g., CO 02, CO 05, CO 40) accompanied by suffixes indicating enclosure height and lead length. This helps in clear communication and documentation of component specifications across the supply chain.
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Guidance for Outline Drawings
The standard outlines best practices for creating uniform dimensional drawings, including third-angle projection, use of dimensional symbols, inclusion of actual-size sketches, and detailed tables. This supports consistent manufacturing and reduces ambiguity in technical documentation.
Applications
Quartz crystal controlled oscillators standardized under IEC 60679-3:2012 are widely used in applications demanding high frequency stability and reliability, including:
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Telecommunications
For frequency control in transmitters, receivers, and network synchronization equipment.
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Consumer Electronics
Embedded in devices such as clocks, computers, and mobile phones where precise timing is crucial.
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Industrial and Instrumentation
Used in test and measurement systems where consistency and interchangeability of components reduce maintenance effort.
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Aerospace and Defense
Employed in mission-critical systems requiring robust components complying with international quality standards.
By adhering to IEC 60679-3 requirements, manufacturers ensure that quartz crystal oscillators meet industry expectations for mechanical compatibility and functional performance, facilitating global use and replacements.
Related Standards
IEC 60679-3:2012 is part 3 of the broader IEC 60679 series that covers quartz crystal controlled oscillators of assessed quality. Related standards include:
- IEC 60679-1 – General requirements covering performance criteria and test methods for oscillators.
- IEC 60679-2 – Specifications for specific types of oscillators or their components.
- IEC 60679-4 – Additional parts addressing environmental or reliability testing for assessed quality oscillators.
Together, these IEC standards help unify the technical requirements and testing procedures for frequency control devices worldwide, ensuring system compatibility and quality assurance.
Keywords: IEC 60679-3, quartz crystal oscillator, oscillator enclosure, lead connections, frequency control devices, electronic component standard, mechanical interchangeability, crystal oscillator outline dimensions, international electrotechnical commission, oscillator pin layout.
Open preview (PDF)Quartz crystal controlled oscillators of assessed quality - Part 3: Standard outlines and lead connections
