QT325S-20.000MEEJ-T

Overview

The QST QT325S-20.000MEEJ-T is a surface-mount quartz crystal resonator designed for precision timing applications. It operates at a nominal frequency of 20 MHz with a load capacitance of 10 pF and an equivalent series resistance of 50 Ohms. The component utilizes the AT-cut resonance mode to ensure stable performance across varying environmental conditions. It features a compact 3.2 x 2.5 mm package footprint, suitable for space-constrained PCB layouts. Frequency stability is specified at ±20 ppm within the -40°C to +85°C temperature range, providing reliable clock signals for digital circuits.

Feature Summary

• AT-cut quartz construction ensures high frequency stability and low aging rates
• Compact 3.2mm x 2.5mm SMD package facilitates automated assembly and dense board layouts
• Designed for robust operation across extended industrial temperature ranges

Applications

• Microcontroller unit (MCU) clock sources
• Digital signal processing systems
• Communication interface modules

Procurement Notes

Verify the specific suffix 'E' corresponds to the required ±20 ppm stability specification for your application environment. Confirm that the 10 pF load capacitance matches the oscillator circuit design requirements. Ensure the 50 Ohm ESR aligns with the driving capability of the host system. Cross-reference the package dimensions against the target PCB footprint to guarantee mechanical compatibility during assembly.

Selection Notes

Select this component when a 20 MHz reference is required with moderate stability in harsh environments. The ±20 ppm tolerance suits general-purpose digital logic where tight phase noise is not critical. Consider the 10 pF load capacitance to avoid frequency pulling issues in the circuit design. Evaluate the 50 Ohm ESR to ensure sufficient drive level without over-driving the crystal element.

Part Context

This part belongs to the QT325S series of surface-mount crystals from QST. The series offers various frequency options and stability grades defined by alphanumeric suffixes. The '20.000' indicates the 20 MHz nominal frequency, while 'MEEJ' defines the specific stability, package, and termination characteristics unique to this variant within the broader product line.

Replacement Considerations

Direct substitutes must match the 20 MHz frequency, 10 pF load capacitance, and ±20 ppm stability. Verify that alternative components support the same 3.2x2.5mm package and 50 Ohm ESR. Check if competitor parts offer compatible operating temperature ranges and drive level specifications.