QT49S-24.000MEEJ-T

Overview

QT49S-24.000MEEJ-T is a surface-mount quartz crystal manufactured by QST, operating at a fundamental frequency of 24 MHz. It features a frequency tolerance and stability of ±10 ppm at 25°C, with an equivalent series resistance (ESR) of 30 Ohms. The component utilizes a standard HC-49/US package, measuring 11.40 mm in length, 4.80 mm in width, and up to 4.10 mm in height. It is designed for a load capacitance of 18 pF and operates within a temperature range of -20°C to +70°C.

Feature Summary

• Standard HC-49/US surface-mount package design for direct PCB footprint compatibility
• Fundamental mode operation ensuring stable oscillation at 24 MHz
• Low equivalent series resistance supporting reliable startup conditions

Applications

• Microcontroller clock generation circuits
• Consumer electronic device timing references
• Communication module synchronization

Procurement Notes

Verify the specific suffix MEEJ-T against the official QST QT49S datasheet to confirm pin configuration and termination type. Ensure the selected variant matches the required load capacitance and ESR specifications for the target oscillator circuit. Confirm RoHS compliance status if environmental regulations apply to the final assembly.

Selection Notes

Select this component when a standard 24 MHz reference is required for space-constrained designs utilizing the HC-49/US form factor. The ±10 ppm stability suits general-purpose digital logic applications. Consider the 30 Ohm ESR value to ensure compatibility with the driving circuit's gain margin requirements without excessive power dissipation.

Part Context

The QT49S series represents QST's line of high-reliability surface-mount crystals. This model belongs to the broader family of HC-49/US packaged components, widely adopted in the electronics industry for its mechanical robustness and standardized mounting dimensions. It serves as a common timing element in mass-produced consumer hardware.

Replacement Considerations

The TXC 9C-11.2896MEEJ-T is documented as a parameter-equivalent substitute, though it differs in frequency. Verify electrical compatibility before substitution.