QT325S-18.432MAGQ-T

Overview

The QST QT325S-18.432MAGQ-T is a surface-mount crystal oscillator operating at a nominal frequency of 18.432 MHz. It utilizes a 3.2x2.5 mm package with four no-lead terminals. The component features a load capacitance of 10 pF and an equivalent series resistance (ESR) of 50 Ohms. Frequency stability is specified at ±30 ppm within the -20°C to +70°C temperature range, with an additional tolerance of ±50 ppm over the extended -40°C to +85°C range.

Feature Summary

• Compact 3.2x2.5 mm surface-mount footprint for space-constrained designs
• Stable frequency generation with defined load capacitance requirements
• Robust thermal performance across industrial and extended temperature ranges

Applications

• Microcontroller clock sources
• Communication module timing circuits
• Digital signal processing systems

Procurement Notes

Verify the specific suffix codes against official QST documentation to ensure accurate frequency, stability, and packaging specifications. Confirm that the load capacitance matches the target circuit design requirements. Check for RoHS compliance status if environmental regulations apply to the final assembly. Ensure storage conditions adhere to manufacturer guidelines to maintain component integrity prior to soldering.

Selection Notes

Select this component when a precise 18.432 MHz reference is required in a small form factor. Consider the ±30 ppm stability for standard industrial applications or the extended range option for harsher environments. Evaluate the 10 pF load capacitance compatibility with the host oscillator circuit. Compare ESR values against driver capability to ensure reliable startup.

Part Context

This part belongs to the QST QT325S series of thin-package crystals. The series offers various frequency options and stability grades within a standardized 3.2x2.5 mm outline. It serves as a fundamental timing element for electronic systems requiring stable oscillation without the bulk of through-hole alternatives.

Replacement Considerations

Direct substitutes must match the 18.432 MHz frequency, 10 pF load capacitance, and 3.2x2.5 mm package dimensions. Verify equivalent ESR and stability specifications to ensure circuit compatibility. Cross-reference pinout configurations to guarantee seamless integration into existing layouts.