XTL721-S349-005

Crystals Overview

The Siward XTL721-S349-005 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 7 pF and an equivalent series resistance (ESR) of 65 kOhms. Housed in a compact SMD package with dimensions of 3.2 x 1.5 mm, it supports a wide operating temperature range from -40°C to +125°C. This device utilizes the piezoelectric effect of quartz to generate stable frequencies.

Crystals Feature Summary

• Tuning fork crystal design optimized for low-power clock applications
• Compact surface-mount form factor suitable for space-constrained PCBs
• Wide industrial temperature range capability for harsh environments

Crystals Applications

• Real-time clock circuits in consumer electronics
• Microcontroller system oscillators
• Wearable technology power management units

Crystals Procurement Notes

Verify that the specific part number matches the required load capacitance of 7 pF and the ±20 ppm tolerance. Confirm the package dimensions align with the footprint on the target printed circuit board. Ensure the operating temperature range meets the environmental requirements of the final assembly. Cross-reference the manufacturer's latest documentation to confirm RoHS compliance status before integration.

Crystals Selection Notes

Select this component when a precise 32.768 kHz reference is needed for timekeeping functions. The 7 pF load capacitance must match the oscillator circuit design to ensure accurate frequency generation. Consider the small 3215 package size if board real estate is limited. Verify that the ESR value is compatible with the driving circuit's stability requirements.

Crystals Part Context

This model belongs to the XTL721 series of tuning fork crystals manufactured by Siward Crystal Technology Co., Ltd. These components are passive devices relying on quartz resonance. They are distinct from active oscillators as they require an external oscillator circuit to function. The series is engineered for high reliability in standard electronic assemblies.

Crystals Replacement Considerations

Compatible substitutes include the SIWARD XTL721-S999-286, which shares the 32.768 kHz frequency but utilizes a 12.5 pF load capacitance. Ensure any replacement maintains the same package outline and electrical characteristics to guarantee circuit compatibility.