XTL721-S999-435

Crystals Overview

The Siward XTL721-S999-435 is a surface-mount tuning fork crystal 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 12.5 pF and a motional resistance of 70 kOhms. It utilizes a 2-SMD, no-lead package with dimensions of 3.20mm x 1.50mm and a maximum seated height of 0.90mm. The device supports an operating temperature range of -40°C to +85°C and complies with RoHS standards.

Crystals Feature Summary

• Utilizes quartz piezoelectric effect for stable frequency generation
• Designed as a low-power tuning fork resonator
• Supports standard surface mount assembly processes

Crystals Applications

• Real-time clock circuits in consumer electronics
• Microcontroller system oscillators
• Portable battery-powered devices requiring low power consumption

Crystals Procurement Notes

Verify the specific suffix code against official Siward documentation to confirm exact electrical parameters and packaging specifications. Ensure compatibility with existing PCB footprint and reflow soldering profiles. Confirm RoHS compliance status through manufacturer datasheets prior to integration into regulated products.

Crystals Selection Notes

Select this component when a 32.768 kHz reference is required for timekeeping functions. Consider the 12.5 pF load capacitance requirement for circuit design matching. Evaluate the 70 kOhm resistance value against oscillator amplifier capabilities. Assess the 3215 package size constraints within the target enclosure design.

Crystals Part Context

This part belongs to the Siward XTL721 series of tuning fork crystals. These components are engineered for high stability and low power consumption. The series typically includes various suffixes denoting specific tolerances or packaging variations. They are widely used in industries requiring precise time synchronization.

Crystals Replacement Considerations

Cross-reference with other 32.768 kHz SMD crystals having identical 12.5 pF load capacitance and 3215 package dimensions. Verify equivalent motional resistance and frequency tolerance specifications. Ensure mechanical footprint compatibility before substitution.