XTL721-S999-301

Crystals Overview

The Siward XTL721-S999-301 is a surface-mount tuning fork crystal resonator designed for precision timing applications. It operates at a nominal frequency of 32.768 kHz with a frequency tolerance of ±20 ppm. The component features a load capacitance of 9 pF and an equivalent series resistance (ESR) of 70 kOhms. Housed in a compact 2-SMD, No Lead package measuring 0.126 inches by 0.059 inches, it supports a wide operating temperature range from -40°C to +125°C.

Crystals Feature Summary

• Tuning fork architecture optimized for low-power clock generation
• Automotive-grade reliability certified under AEC-Q200 standards
• Wide industrial temperature stability across extreme thermal conditions

Crystals Applications

• Real-time clock circuits in automotive infotainment systems
• Precision timekeeping modules in industrial instrumentation
• Low-power embedded controllers requiring stable reference frequencies

Crystals Procurement Notes

Verify the specific suffix '301' against official SIWARD documentation to confirm the 9pF load capacitance specification, as other variants in this series may utilize different capacitance values. Ensure the procurement channel provides traceable manufacturing data consistent with AEC-Q200 certification requirements for automotive deployment.

Crystals Selection Notes

Select this component when a robust, automotive-certified 32.768 kHz reference is required for harsh environments. The 70 kOhm ESR necessitates careful oscillator circuit design to ensure reliable startup. Compare against standard commercial grades if automotive qualification is not mandatory for the target application.

Crystals Part Context

This part belongs to the XTL721 series of SMD crystals from Siward Crystal Technology. The series utilizes quartz tuning fork technology to provide stable frequency references. The model number indicates specific electrical parameters and packaging dimensions tailored for high-reliability surface-mount assembly processes.

Crystals Replacement Considerations

Direct substitutes include the XTL721-S999-301 from other manufacturers offering identical 32.768 kHz, 9pF, and AEC-Q200 specifications. Verify pin compatibility and ESR matching before integration.