QT49S-27.000MEEJ-T

Overview

The QST QT49S-27.000MEEJ-T is a surface-mount quartz crystal oscillator operating at a nominal frequency of 27 MHz. It belongs to the QT49S series and utilizes an HC-49/US package configuration with SMD mounting. The component features a load capacitance of 18 pF and a maximum equivalent series resistance (ESR) of 30 Ohms. Frequency tolerance and stability are specified at ±10 ppm, ensuring precise timing performance for electronic circuits requiring stable clock signals.

Feature Summary

• Surface-mount design compatible with automated assembly processes
• High frequency stability within ±10 ppm tolerance range
• Standardized HC-49/US form factor adapted for SMD integration

Applications

• Microcontroller clock source generation
• Communication module timing references
• Digital signal processing circuit synchronization

Procurement Notes

Verify manufacturer authenticity through authorized channels. Confirm package orientation and pinout compatibility with PCB footprint. Validate lot traceability and RoHS compliance status. Ensure storage conditions maintain component integrity prior to soldering.

Selection Notes

Select this component when 27 MHz precision timing is required in space-constrained designs. Consider the 18 pF load capacitance requirement for circuit matching. Evaluate thermal stability needs against the ±10 ppm specification. Compare ESR limits with driver circuit capabilities.

Part Context

This part is part of the QT49S series from QST, designed for surface-mount applications. It shares family characteristics with other frequencies in the series but differs in specific electrical parameters such as frequency and ESR values defined by the model suffix.

Replacement Considerations

Direct substitutes include other manufacturers' 27 MHz SMD crystals with identical 18 pF load capacitance and ≤30 Ohm ESR. Verify pin compatibility and mechanical dimensions before substitution.