XTL721-S999-286

Crystals Overview

The Siward XTL721-S999-286 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 stability of ±20 ppm. The component features a load capacitance of 12.5 pF and an equivalent series resistance (ESR) of 70 kOhms. It utilizes a 2-SMD, No Lead package with dimensions of 3.2 x 1.5 mm (3215 metric size). This passive quartz crystal relies on the piezoelectric effect to generate stable oscillations.

Crystals Feature Summary

• Utilizes tuning fork geometry for low power consumption
• Provides high frequency stability for accurate timekeeping
• Features compact surface-mount packaging for automated assembly

Crystals Applications

• Real-time clock circuits in consumer electronics
• Bluetooth device synchronization
• Wearable technology power management
• Medical instrumentation timing references

Crystals Procurement Notes

Verify that the specific part number matches the required load capacitance of 12.5 pF and frequency tolerance of ±20 ppm. Confirm the package type is 3215 SMD. Ensure compatibility with the target circuit's oscillator configuration. Check for any specific handling requirements related to quartz components during storage and assembly processes.

Crystals Selection Notes

Select this component when a precise 32.768 kHz reference is required for low-power applications. Consider the 12.5 pF load capacitance requirement for circuit design matching. Evaluate the 70 kOhm ESR against the oscillator circuit capabilities. The 3215 footprint offers space efficiency compared to larger through-hole alternatives.

Crystals Part Context

This component belongs to the Siward XTL721 series of tuning fork crystals. It is manufactured by Siward Crystal Technology, a company specializing in quartz frequency control elements. The series includes various variants differing in frequency, capacitance, and package size, but all share the fundamental tuning fork architecture for timekeeping applications.

Crystals Replacement Considerations

Compatible substitutes include SIWARD XTL721-S349-005, which shares the 32.768 kHz frequency and 3215 package form factor. Verify that alternative parts meet the same 12.5 pF load capacitance and ±20 ppm stability specifications before integration.