QT325S-16.777216MDHE-T

Overview

The QT325S-16.777216MDHE-T is a surface-mount crystal resonator manufactured by QST, designed for precision timing applications. It operates at a fundamental frequency of 16.777216 MHz and utilizes a 4-SMD, No Lead package with dimensions of 3.2mm x 2.5mm x 0.7mm. The component features a load capacitance of 12pF and an equivalent series resistance (ESR) of 80 Ohms. Frequency stability is rated at ±10ppm over the operating temperature range of -20°C to +70°C, as indicated by the 'E' suffix in the part number. This configuration ensures reliable clock signal generation for microcontrollers and communication interfaces requiring high accuracy.

Feature Summary

• Provides stable oscillation for digital circuit timing requirements
• Compact surface-mount design facilitates automated PCB assembly
• Ensures precise frequency output for data synchronization tasks

Applications

• Microcontroller clock sources
• Communication interface timing
• Digital signal processing systems

Procurement Notes

Verify the complete part number against official QST documentation to confirm specific tolerance and temperature range parameters. Ensure the ordering suffix matches the required load capacitance and stability specifications for your design. Cross-reference the package type and pin configuration with your PCB footprint library to prevent assembly errors. Confirm that the selected variant meets the thermal and electrical requirements of the target application environment before finalizing procurement.

Selection Notes

Select this component when a 16.777216 MHz reference is required for audio or video sampling rates. Consider the ±10ppm stability rating for applications sensitive to clock drift. Evaluate the 12pF load capacitance compatibility with the host oscillator circuit. Assess the 4-SMD package size constraints within the available board space. Verify the operating temperature range aligns with the environmental conditions of the end product.

Part Context

This crystal belongs to the QT325S series from QST, which offers various frequency and stability options within a standardized small outline package. The series is widely used in consumer electronics and industrial control systems where space efficiency and timing accuracy are critical. Similar parts in the lineup may differ in frequency, load capacitance, or stability ratings, necessitating careful selection based on specific circuit requirements.

Replacement Considerations

Direct substitutes must match the 16.777216 MHz frequency, 12pF load capacitance, 4-SMD package, and ±10ppm stability. Verify equivalent ESR values and operating temperature ranges to ensure circuit compatibility. Consult manufacturer cross-reference lists for approved alternatives.