QT325G-27.000MEEJ-T

Overview

The QT325G-27.000MEEJ-T is a surface-mount quartz crystal resonator manufactured by QST Products, LLC. It operates at a nominal frequency of 27 MHz with a load capacitance of 18 pF. The component exhibits a frequency stability of ±10 ppm and a frequency tolerance of ±10 ppm within the temperature range of -20°C to +70°C. Its equivalent series resistance (ESR) is specified as 60 Ohms. The device utilizes a 4-SMD, no lead package configuration.

Feature Summary

• Surface-mount design for automated assembly
• High frequency stability within industrial temperature limits
• Low equivalent series resistance for efficient oscillation

Applications

• Microcontroller clock sources
• Communication module timing references
• Industrial control system oscillators

Procurement Notes

Verify the specific suffix MEEJ against official QST documentation to confirm the exact temperature range and tolerance specifications. Ensure compatibility with reflow soldering profiles suitable for 4-SMD packages. Cross-reference the ESR value with circuit requirements to guarantee stable oscillator startup conditions.

Selection Notes

Select this component when a 27 MHz reference is required with tight ±10 ppm stability in standard industrial environments. Compare ESR values against oscillator circuit designs to ensure proper drive level management. Evaluate package dimensions against PCB layout constraints for SMD mounting.

Part Context

This part belongs to the QT325G series of surface-mount crystals from QST. The series offers various frequency options and stability grades defined by alphanumeric suffixes. The QT325G form factor provides a compact solution for space-constrained electronic applications requiring precise timing signals.

Replacement Considerations

Direct substitutes include other 27 MHz crystals with identical 18 pF load capacitance and ±10 ppm stability. Verify that alternative parts match the 4-SMD footprint and 60 Ohm ESR specification to maintain circuit performance without redesign.