QT252S-40.000MAHE-T

Overview

The QT252S-40.000MAHE-T is a quartz crystal resonator manufactured by QST, designed for precision timing applications. It operates at a fundamental frequency of 40 MHz with a load capacitance of 12 pF and an equivalent series resistance of 60 Ohms. The component exhibits a frequency stability of ±30 ppm at 25°C and maintains this tolerance across the industrial temperature range of -40°C to +85°C. It utilizes a 4-SMD, no lead package with dimensions of 2.5 x 2.0 mm, ensuring compatibility with automated surface-mount assembly processes.

Feature Summary

• Seam seal construction utilizing ceramic materials for enhanced environmental protection
• Industrial-grade temperature stability maintaining consistent performance from -40°C to +85°C
• Compact 4-SMD no-lead footprint optimized for high-density surface-mount layouts

Applications

• Precision clock generation in microcontroller systems
• Timing references for communication interface circuits
• Frequency control in industrial instrumentation modules

Procurement Notes

Verify the specific suffix HE against official QST documentation to confirm the exact load capacitance and temperature range specifications. Ensure that the 4-SMD no-lead package dimensions align with the target PCB land pattern design. Cross-reference the datasheet parameters to validate suitability for the intended operating environment before finalizing procurement decisions.

Selection Notes

Select this component when a 40 MHz reference signal is required within a compact form factor. The ±30 ppm stability rating supports standard digital logic timing requirements. Consider the 12 pF load capacitance requirement to ensure proper oscillator circuit tuning. Evaluate the thermal characteristics against the maximum ambient temperatures expected in the final application assembly.

Part Context

This part belongs to the QT252S family of seam seal crystals produced by QST. The series offers various frequency options and stability grades within a standardized 2.5 x 2.0 mm package. The MAHE suffix indicates specific electrical tolerances and packaging configurations distinct from other variants in the lineup.

Replacement Considerations

Direct substitutes include other 40 MHz crystals with identical 2.5 x 2.0 mm packages and 12 pF load capacitance. Verify equivalent ESR values and stability ratings to maintain circuit performance. Check pinout compatibility and soldering thermal profiles for seamless integration.