XTL721-S999-436

Crystals Overview

The Siward XTL721-S999-436 is a surface-mount quartz crystal resonator designed for precision timing applications. It operates at a fundamental frequency of 32.768 kHz, selected for its binary divisibility to generate accurate one-second intervals in clock circuits. The component features a load capacitance of 9 pF and maintains a frequency tolerance of ±20 ppm. It exhibits an equivalent series resistance (ESR) of 70 kOhms and supports an operating temperature range from -40°C to +125°C. The device utilizes a 2-SMD, no-lead package configuration.

Crystals Feature Summary

• Utilizes piezoelectric quartz properties for stable mechanical and electrical performance
• Certified to AEC-Q200 automotive reliability standards
• Supports fundamental operating mode with low power consumption characteristics

Crystals Applications

• Automotive electronic systems requiring precise timekeeping
• Real-time clock modules in consumer electronics
• Smart wearable devices needing compact timing solutions

Crystals Procurement Notes

Verify the specific suffix against official Siward documentation to confirm exact load capacitance and tolerance specifications. Ensure compatibility with the target circuit's oscillator design parameters. Confirm that the AEC-Q200 rating meets the required automotive grade standards for the intended application environment.

Crystals Selection Notes

Select this component when a 32.768 kHz fundamental frequency is required for digital clock division. Consider the 9 pF load capacitance requirement for oscillator circuit stability. Evaluate the wide temperature range capability for harsh environmental conditions. Verify the surface-mount footprint matches the PCB layout constraints.

Crystals Part Context

This part belongs to the Siward XTL721 series of tuning fork crystals. These components are engineered for high-frequency stability using cut quartz technology. The series typically includes various package sizes and electrical specifications tailored for different industrial and consumer electronics applications.

Crystals Replacement Considerations

Cross-reference with other 32.768 kHz SMD crystals having 9 pF load capacitance and ±20 ppm tolerance. Ensure substitute parts meet AEC-Q200 requirements if automotive use is intended. Verify identical package dimensions for direct board replacement.