QT325S-40.000MEIQ-T

Overview

The QST QT325S-40.000MEIQ-T is a surface-mount quartz crystal resonator operating at a fundamental frequency of 40 MHz. It features a compact SMD package measuring 3.2mm x 2.5mm with a height of 0.7mm. The component exhibits a frequency tolerance of ±10ppm and a frequency stability of ±20ppm over the specified temperature range. It utilizes a load capacitance of 10pF and has an equivalent series resistance (ESR) of 50 Ohms. The device is designed for operation within a temperature range of -40°C to +85°C, ensuring reliable performance in various electronic applications requiring precise timing.

Feature Summary

• Compact 3.2mm x 2.5mm surface-mount design for space-constrained PCB layouts
• High frequency stability of ±20ppm across extended industrial temperature ranges
• Low equivalent series resistance of 50 Ohms for efficient circuit integration

Applications

• Clock generation for microcontrollers and digital signal processors
• Timing references in communication modules and network interfaces
• Precision timing circuits in consumer electronics and IoT devices

Procurement Notes

Verify the specific suffix 'IQ' against official QST documentation to confirm the exact temperature stability grade and packaging specifications. Ensure compatibility with reflow soldering profiles suitable for 3.2x2.5mm SMD crystals. Cross-reference the load capacitance requirement of 10pF with the target circuit design to maintain frequency accuracy. Confirm that the 50 Ohm ESR aligns with the oscillator circuit's drive level constraints.

Selection Notes

Select this component when a 40 MHz reference is required in a small form factor. The ±10ppm initial tolerance suits applications needing tight frequency accuracy at room temperature. The extended temperature range capability makes it suitable for industrial environments. Consider the 10pF load capacitance when designing the oscillator circuit to ensure stable oscillation without frequency pulling.

Part Context

This part belongs to the QST QT325S series of thin, low-profile quartz crystals. The series offers various frequency options and stability grades tailored for modern electronics. The 3.2x2.5mm footprint provides a balance between size and performance, widely adopted in portable and high-density electronic designs.

Replacement Considerations

Direct substitutes must match the 40 MHz frequency, 3.2x2.5mm package, 10pF load capacitance, and ±20ppm stability. Verify thermal characteristics and ESR values from alternative manufacturers to ensure circuit compatibility.