QT3CD-32.768KEZF-T

Overview

The QT3CD-32.768KEZF-T is a quartz crystal resonator manufactured by QST, designed for surface-mount applications. It operates at a fundamental frequency of 32.768 kHz, a standard rate for real-time clock circuits. The component features a compact SMD package with dimensions of 3.2 x 1.5 x 0.9 mm and utilizes a no-lead construction. It exhibits a frequency tolerance of ±10 ppm at 25°C and supports a load capacitance of 12.5 pF. The device is rated for an operating temperature range from -40°C to +85°C, ensuring reliability in various electronic environments.

Feature Summary

• Provides precise timing signals for real-time clock applications through stable quartz resonance.
• Utilizes a compact surface-mount footprint suitable for space-constrained circuit board designs.
• Maintains specified frequency accuracy across a wide industrial temperature range.

Applications

• Real-time clock (RTC) circuits in consumer electronics
• Microcontroller system clocks
• Portable battery-powered devices

Procurement Notes

Verify the specific suffix 'E' confirms the ±10 ppm tolerance requirement against your design specifications. Ensure the PCB land pattern matches the 3.2x1.5mm SMD package dimensions. Confirm that the 12.5pF load capacitance aligns with the oscillator circuit design. Check for RoHS compliance status if required by your manufacturing standards. Validate the operating temperature range meets the environmental conditions of the final product.

Selection Notes

Select this component when a 32.768 kHz reference is required for timekeeping functions. The ±10 ppm tolerance offers higher precision than standard ±20 ppm variants. Consider the small 3.2x1.5mm package size for dense layouts. Ensure the host oscillator circuit is compatible with the 12.5pF load capacitance specification. Verify that the -40°C to +85°C range covers the intended operational environment.

Part Context

This part belongs to the QT3C series of kHz crystals from QST. The series includes variants with different tolerances such as ±20 ppm and ±30 ppm. The 'D' suffix typically denotes ±20 ppm, while 'E' indicates ±10 ppm. These components are commonly used alongside other timing elements like ceramic resonators or MEMS oscillators in embedded systems requiring low-power clock sources.

Replacement Considerations

QT3CD-32.768KDZF-T offers similar physical dimensions but has a ±20 ppm tolerance instead of ±10 ppm. QT3CD-32.768KAZF-T provides a ±30 ppm tolerance option. Direct substitution requires verifying if the reduced accuracy impacts the system's timing requirements. Ensure the replacement maintains the same 12.5pF load capacitance and package size compatibility.