QT325G-40.000MAHJ-T

Overview

The QT325G-40.000MAHJ-T is a quartz crystal resonator manufactured by QST, designed for surface-mount applications. It operates at a fundamental frequency of 40.000 MHz and utilizes a glass seal package construction. The component features a 4-SMD, no-lead footprint with dimensions of 3.2mm x 2.5mm. Frequency stability is specified at ±30ppm at 25°C and ±30ppm over the temperature range of -40°C to +85°C. The load capacitance is 18pF, and the equivalent series resistance is typically 60 Ohms.

Feature Summary

• Glass-sealed construction for enhanced environmental protection
• Compact 3.2x2.5mm SMD form factor suitable for space-constrained designs
• High frequency stability across wide industrial temperature ranges

Applications

• Clock generation for microprocessors and microcontrollers
• Communication module timing references
• Consumer electronics requiring precise frequency control

Procurement Notes

Verify the manufacturer designation carefully, as the QT325G series is produced by both TXC Corporation and QST Products LLC. Ensure the specific suffix matches the required stability and packaging specifications. Confirm that the glass seal variant aligns with your environmental requirements. Cross-reference the datasheet from the specific supplier to validate electrical parameters before integration into the design.

Selection Notes

Select this component when a 40MHz reference signal is required in a compact surface-mount format. The glass seal offers superior reliability compared to standard ceramic packages in harsh environments. Consider the 18pF load capacitance compatibility with the host oscillator circuit. Evaluate the ±30ppm stability against system timing tolerance requirements.

Part Context

This part belongs to the QT325G family of MHz quartz crystals. The series is characterized by its small outline package and glass-seal technology. Variants within the family differ primarily by frequency, stability ratings, and load capacitance values while maintaining consistent physical dimensions and mounting characteristics.

Replacement Considerations

Direct substitutes include other manufacturers' 3.2x2.5mm glass-seal crystals at 40MHz with ±30ppm stability. Verify pinout compatibility and load capacitance matching. Check if alternative suppliers offer identical thermal and mechanical specifications.