QT252S-12.000MEIE-T

Overview

The QST QT252S-12.000MEIE-T is a 12 MHz quartz crystal resonator housed in a compact 2.5x2.0 mm surface-mount package. It features a seam-sealed ceramic construction designed for enhanced moisture resistance and long-term stability. The component exhibits a frequency tolerance of ±10 ppm at 25°C and maintains a temperature stability of ±20 ppm across the -20°C to +70°C operating range. With a load capacitance of 12 pF and an equivalent series resistance (ESR) of 100 Ohms, it supports reliable oscillation in standard clock circuits.

Feature Summary

• Seam-sealed ceramic packaging provides superior protection against humidity and environmental contaminants compared to plastic encapsulated alternatives.
• Compact 2.5x2.0 mm footprint allows for high-density board layouts in space-constrained consumer and industrial designs.

Applications

• Microcontroller unit (MCU) clock sources
• Bluetooth and WiFi communication modules
• Industrial sensor terminals

Procurement Notes

Verify that the specific suffix MEIE corresponds to the required 12 pF load capacitance and ±20 ppm temperature stability range. Confirm RoHS compliance status with the supplier, as some variants may contain lead under exemption clauses. Ensure the ordering part number matches the exact frequency and package dimensions required by the schematic.

Selection Notes

Select this component when a small form factor is critical but higher reliability than plastic packages is needed. The 12 pF load capacitance must match the host controller's specified CL value to ensure accurate frequency generation without external trimming. Consider the ±20 ppm stability sufficient for most indoor consumer electronics while offering better performance than standard ±30 ppm parts.

Part Context

The QT252S belongs to QST’s line of miniature seam-sealed crystals, bridging the gap between larger industrial components and basic plastic SMDs. This series is engineered for applications requiring robustness against moisture ingress while maintaining strict size constraints typical of modern portable devices and dense PCB assemblies.

Replacement Considerations

QT252S-12.000MEEQ-T: Identical electrical specifications including 12 pF load capacitance and ±10 ppm/±20 ppm stability ratings. Verify package compatibility and sourcing availability before substitution.