QT325S-19.200MEIE-T

Overview

The QT325S-19.200MEIE-T is a surface-mount quartz crystal resonator manufactured by QST, designed for precise frequency generation in electronic circuits. It operates at a fundamental frequency of 19.2 MHz with a load capacitance of 12 pF and an equivalent series resistance (ESR) typically around 80 ohms. The component features a compact 4-SMD, no-lead package with dimensions of 3.2 x 2.5 x 0.7 mm. Frequency stability is specified at ±10 ppm within the operating temperature range of -20°C to +70°C, ensuring reliable performance in standard commercial applications requiring stable clock signals.

Feature Summary

• Compact surface-mount design suitable for space-constrained PCB layouts
• High frequency stability within defined commercial temperature ranges
• Low equivalent series resistance for efficient circuit operation

Applications

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

Procurement Notes

Verify the specific suffix 'E' confirms the ±10 ppm stability rating over the -20°C to +70°C range, as other suffixes like 'D' or 'A' indicate different tolerances. Ensure the ordering part number matches the required load capacitance of 12 pF and physical package dimensions. Cross-reference manufacturer datasheets to confirm RoHS compliance and lead-free status before final procurement decisions.

Selection Notes

Select this component when a 19.2 MHz reference is required for commercial-grade applications with moderate stability needs. Consider the 12 pF load capacitance compatibility with the target oscillator circuit's input capacitance. Evaluate the ±10 ppm tolerance against system jitter requirements. Compare against alternative suffixes if wider temperature ranges or different stabilities are needed for the specific environment.

Part Context

This part belongs to the QT325S series of thin-package crystals from QST, offering a small footprint compared to traditional HC-49 packages. The series provides various frequency options and stability grades, allowing designers to balance cost, size, and performance. The 3.2x2.5mm form factor is widely adopted in consumer electronics and portable devices where board real estate is limited.

Replacement Considerations

Direct substitutes must match the 19.2 MHz frequency, 12 pF load capacitance, and ±10 ppm stability. Check pinout compatibility and mechanical dimensions for direct replacement. Verify that alternative manufacturers offer the same ESR characteristics to ensure oscillator startup reliability.