32.768 kHz ±20ppm Crystal 9pF 70 kOhms 2-SMD, No Lead

The XTL721-S999-301 specification defines the engineering requirements for a crystal oscillator component intended to provide a stable and accurate timing reference for electronic systems. This specification establishes the functional, electrical, mechanical, environmental, and quality requirements necessary to ensure precise frequency generation, reliable operation, and long-term stability in embedded, industrial, communication, and consumer electronic applications.

The component is intended for use in applications requiring accurate clock generation and synchronization, including microcontroller-based systems, communication interfaces, digital signal processing, and timing circuits. It provides a highly stable frequency reference with low phase noise and excellent frequency stability to support reliable system operation under varying environmental conditions.

Engineering Requirements

The crystal component shall be manufactured using high-purity quartz material and precision fabrication processes to ensure consistent resonant frequency characteristics, low aging effects, and dependable long-term performance. The construction shall provide stable oscillation characteristics throughout the specified operating temperature and environmental conditions.

Electrical characteristics shall ensure accurate frequency stability, low equivalent series resistance, and reliable oscillation startup when used with compatible oscillator circuits. The component shall maintain stable timing performance under normal supply variations, temperature fluctuations, and continuous operating conditions.

Mechanical construction shall be suitable for automated surface-mount assembly and compatible with standard solder reflow manufacturing processes. The package shall provide mechanical robustness and resistance to vibration, mechanical shock, thermal cycling, and handling without degradation of electrical performance or structural integrity.

Workmanship shall be free from defects including contamination, package cracking, seal failure, lead deformation, or structural inconsistencies that could adversely affect frequency accuracy or operational reliability. Inspection, validation, and testing shall be performed using calibrated equipment and controlled quality procedures to verify compliance with engineering and manufacturing requirements.

Any deviation from this specification shall require formal engineering evaluation, documented technical justification, and approval through the established engineering change control process before implementation.

Documentation

Supporting documentation shall include engineering drawings, frequency performance specifications, electrical characterization reports, qualification records, inspection reports, reliability data, material declarations, and revision-controlled manufacturing documentation. All documentation shall be maintained under formal configuration management and quality assurance systems to ensure complete product traceability.

Revision Control

Any modification to this specification shall be managed through the formal engineering change management process. All revisions shall undergo technical review, validation, and approval before release to ensure continued compliance with design intent and applicable engineering standards.

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