QT325S-38.400MEEQ-T

Overview

The QT325S-38.400MEEQ-T is a surface-mount crystal oscillator manufactured by QST, designed for precise timing applications. It operates at a fundamental frequency of 38.4 MHz with a load capacitance of 10 pF and an equivalent series resistance of 50 Ohms. The component features a compact 4-SMD, No Lead package with dimensions of 3.2mm x 2.5mm x 0.7mm. Frequency tolerance and stability are specified at ±10 ppm within the operating temperature range of -20°C to +70°C. This device utilizes glass seal technology for enhanced reliability and environmental stability in electronic circuits.

Feature Summary

• Compact surface-mount design suitable for space-constrained PCB layouts
• Glass seal construction for improved environmental durability
• Fundamental mode operation ensuring stable frequency generation

Applications

• Microcontroller clock sources
• Communication interface timing
• Consumer electronics timing circuits

Procurement Notes

Verify the specific suffix EEQ against official QST documentation to confirm the exact temperature range and stability specifications. Ensure the ordering part number matches the required load capacitance and frequency tolerance for the target application circuit. Cross-reference manufacturer datasheets for any recent updates regarding RoHS compliance or material declarations.

Selection Notes

Select this component when a 38.4 MHz fundamental frequency is required with ±10 ppm stability across industrial temperatures. Consider the 3.2x2.5mm footprint compatibility with existing board designs. Evaluate the 50 Ohm ESR against the driving circuit capabilities to ensure proper oscillation startup and sustained operation without excessive power consumption.

Part Context

This model belongs to the QT325S family of quartz crystals from QST, characterized by small form factor SMD packaging. The family offers various frequency and stability options tailored for consumer and industrial electronics. The QT325S series emphasizes reliability through glass seal technology, distinguishing it from standard epoxy-sealed alternatives in similar size packages.

Replacement Considerations

Direct substitutes include other manufacturers' 3.2x2.5mm 38.4MHz crystals with identical electrical parameters. Verify pinout compatibility and mechanical height constraints before substitution. Ensure replacement parts meet the same ±10 ppm stability requirements over the -20°C to +70°C range.