QT3CD-32.768KDZY-T

Overview

The QT3CD-32.768KDZY-T is a surface-mount quartz crystal resonator manufactured by QST Products, LLC. It operates at a nominal frequency of 32.768 kHz with a frequency tolerance of ±20 ppm at 25°C. The component features a load capacitance of 7 pF and an equivalent series resistance (ESR) of 70 kΩ. It is housed in a compact SMD package with dimensions of 3.2 x 1.5 x 0.9 mm. The device supports an operating temperature range from -40°C to +85°C, ensuring reliable performance in various electronic applications requiring precise timekeeping.

Feature Summary

• Provides stable oscillation at 32.768 kHz for real-time clock circuits
• Compact SMD form factor suitable for space-constrained designs
• Operates reliably across extended industrial temperature ranges

Applications

• Real-time clock modules in consumer electronics
• Timekeeping circuits in portable devices
• Microcontroller system clocks

Procurement Notes

Verify the manufacturer part number QT3CD-32.768KDZY-T against official QST documentation to confirm specifications. Ensure compatibility with PCB footprint dimensions of 3.2x1.5mm. Check datasheet for soldering profile recommendations and storage conditions to maintain component integrity during assembly.

Selection Notes

Select this component when a 32.768 kHz reference is required for low-power timekeeping applications. Consider the ±20 ppm tolerance and 7pF load capacitance requirements of the host oscillator circuit. Evaluate the ESR value of 70kΩ against the oscillator's drive level constraints to ensure proper startup and stability.

Part Context

This crystal belongs to the QT3CD series of surface-mount quartz resonators designed for general-purpose timing applications. The series offers various frequency options and package sizes, with this specific model focusing on the standard 32.768 kHz rate used in digital clocks and watches. It complements other variants in the lineup that may differ in tolerance or load capacitance.

Replacement Considerations

Substitutes must match the 32.768 kHz frequency, 7pF load capacitance, and SMD 3215-2P footprint. Verify equivalent electrical parameters such as ESR and frequency stability. Confirm thermal rating compatibility for the intended operating environment.