QT121S-38.400MEEQ-T

Overview

The QT121S-38.400MEEQ-T is a 38.4 MHz fundamental mode quartz crystal manufactured by QST Corporation. It features a frequency tolerance and stability of ±10ppm with an 8pF load capacitance. The component utilizes a 4-SMD, no-lead surface-mount package measuring 3.20mm x 2.50mm x 0.80mm. Designed for operation between -20°C and +70°C, it exhibits an equivalent series resistance (ESR) of 60 Ohms. This device complies with RoHS3 standards and holds an MSL rating of 1.

Feature Summary

• Ultra-miniature low-profile design suitable for space-constrained applications
• High frequency stability of ±10ppm across the operating temperature range
• Fundamental mode operation with low equivalent series resistance

Applications

• Microcontroller clock sources
• Communication module timing references
• Portable electronic devices requiring compact oscillators

Procurement Notes

Verify the specific suffix 'MEEQ' against official QST documentation to confirm pin configuration and material specifications. Ensure the load capacitance requirement matches the target circuit design. Confirm compliance with current environmental regulations such as RoHS3 before final procurement approval.

Selection Notes

Select this component when a 38.4 MHz fundamental frequency is required in a 3.2x2.5mm footprint. Consider the ±10ppm stability limit and -20°C to +70°C temperature range against system requirements. Evaluate the 8pF load capacitance compatibility with the host oscillator circuitry.

Part Context

This part belongs to the QT121S series, characterized as ultra-miniature and low-profile crystals from QST. The series targets modern electronics demanding reduced board space while maintaining precise timing performance. It serves as a discrete resonator solution within broader timing device portfolios.

Replacement Considerations

Direct substitutes include the QT121S-38.400MAAV-T from the same manufacturer family. Cross-manufacturer alternatives require matching frequency, package dimensions, and electrical parameters.