QT3CD-32.768KDZF-T

Overview

The QT3CD-32.768KDZF-T is a surface-mount quartz crystal oscillator manufactured by QST Products LLC. It operates at a fundamental frequency of 32.768 kHz, suitable for precision timing applications. The component features a standard 2-SMD, no-lead package with body dimensions of 3.2x1.5x0.9 mm. It exhibits a frequency tolerance of ±20 ppm at 25°C and requires a load capacitance of 12.5 pF. The unit is designed to function within an operating temperature range of -40°C to +85°C.

Feature Summary

• Provides stable 32.768 kHz oscillation for real-time clock circuits
• Compact 3.2x1.5 mm surface-mount footprint for space-constrained designs
• Operates reliably across industrial temperature ranges from -40°C to +85°C

Applications

• Real-time clock (RTC) modules in consumer electronics
• Microcontroller system timing references
• Portable device power management circuits

Procurement Notes

Verify the manufacturer designation carefully, as this specific part number is associated with QST Products LLC rather than TXC Corporation. Confirm that the required load capacitance matches your circuit design, as datasheets may list variations such as 12.5 pF or 18 pF depending on the specific revision or distributor listing. Ensure the SMD package dimensions align with your PCB layout constraints before finalizing procurement.

Selection Notes

Select this component when a compact, low-power 32.768 kHz reference is required for timekeeping functions. The ±20 ppm tolerance offers adequate accuracy for general consumer applications but may not suffice for high-precision metrology. Consider the 12.5 pF load capacitance requirement to ensure proper frequency calibration within the target circuit topology.

Part Context

This crystal belongs to the QT3CD series, characterized by its small 3.2x1.5 mm form factor. It serves as a direct replacement for other industry-standard 32.768 kHz crystals in similar packages. The series is widely used in battery-operated devices where low current consumption and long-term stability are critical for maintaining accurate timekeeping.

Replacement Considerations

Compatible substitutes include the QT3C-32.768KAZY-T from TXC Corporation, though it specifies a different load capacitance of 7 pF and tighter tolerance. Other generic 32.768 kHz crystals in 3215 packages may be used if electrical parameters like load capacitance and ESR are matched.