QT325G-40.000MAHE-T

Overview

The QT325G-40.000MAHE-T is a surface-mount crystal oscillator manufactured by QST, designed for precise frequency generation in electronic circuits. It operates at a nominal frequency of 40 MHz with a frequency stability of ±30 ppm and a tolerance of ±30 ppm. The component features a load capacitance of 12 pF and an equivalent series resistance (ESR) of 60 Ohms. It utilizes a 4-SMD, No Lead package with body dimensions of 3.2 x 2.5 x 0.8 mm. The device is rated for an operating temperature range of -20°C to +70°C and complies with RoHS standards.

Feature Summary

• Compact 3.2x2.5mm SMD footprint suitable for space-constrained designs
• High frequency stability of ±30 ppm ensures reliable timing performance
• RoHS compliant construction for environmental safety

Applications

• Microcontroller clock sources
• Communication module timing references
• Digital signal processing circuits

Procurement Notes

Verify the specific suffix MAHE-T against the manufacturer's current datasheet to confirm exact electrical parameters such as load capacitance and ESR, as these values can vary significantly across different suffixes within the same base model family. Ensure the supplier provides traceable documentation confirming RoHS compliance and active lifecycle status before finalizing procurement orders.

Selection Notes

Select this component when a 40 MHz reference with ±30 ppm stability is required in a compact SMD form factor. Consider the 12 pF load capacitance requirement for circuit design compatibility. Evaluate the -20°C to +70°C temperature range against application environmental conditions. Compare ESR specifications with driver circuit capabilities to ensure proper oscillation startup.

Part Context

This part belongs to the QT325G series of thin-package crystals from QST. The series offers various frequency options and stability grades tailored for consumer electronics and industrial applications. The 3.2x2.5mm size represents a balance between performance and board space efficiency compared to larger HC-49 packages.

Replacement Considerations

Direct substitutes include other 40 MHz crystals with identical 3.2x2.5mm dimensions, 12 pF load capacitance, and ±30 ppm stability. Verify pinout compatibility and mounting style equivalence. Cross-reference with QST's own variants like QT325G-40.000MAGJ-T if parameter adjustments are acceptable.