QT161S-25.000MEIV-T

Overview

The QT161S-25.000MEIV-T is a surface-mount quartz crystal resonator manufactured by QST. It operates at a fundamental frequency of 25 MHz with a load capacitance of 8 pF and a frequency tolerance of ±30 ppm at 25°C. The component features a four-terminal, no-lead SMD package measuring 1.6 mm by 1.2 mm. It exhibits an equivalent series resistance (ESR) of 100 ohms maximum and utilizes a seam-seal ceramic construction. This design supports reliable clock signal generation in compact electronic circuits requiring precise timing references.

Feature Summary

• Four-terminal surface-mount configuration for enhanced stability
• Seam-seal ceramic package construction
• Compact 1.6 x 1.2 mm footprint

Applications

• Microcontroller clock sources
• Communication module timing
• Digital circuit synchronization

Procurement Notes

Verify the specific suffix MEIV against official QST documentation to confirm exact tolerance and temperature range specifications. Ensure the ordering part number matches the required load capacitance and ESR values for the target circuit design. Confirm availability status directly with authorized distributors as supply levels fluctuate. Request updated datasheets to validate compliance with current manufacturing standards before finalizing procurement orders.

Selection Notes

Select this component when a small form factor is required alongside standard 25 MHz timing needs. The four-terminal design offers improved performance over two-terminal variants in high-vibration environments. Verify that the 8 pF load capacitance aligns with the oscillator circuit requirements. Consider the 100 ohm ESR limit to ensure proper oscillation startup conditions are met within the host system design parameters.

Part Context

This part belongs to the QT161S series of seam-seal crystals from QST. The series provides various frequency options in a standardized 1.6 x 1.2 mm package. These components are designed for general-purpose timing applications where space constraints limit the use of larger through-hole or standard SMD packages. The series maintains consistent electrical characteristics across different frequency variants.

Replacement Considerations

Direct replacements must match the 1.6x1.2mm footprint, 25MHz frequency, 8pF load capacitance, and 4-terminal no-lead package type. Verify equivalent ESR and tolerance specifications to maintain circuit performance.