QTM325-40.000MDE-T

Overview

The QTM325-40.000MDE-T is a CMOS quartz oscillator manufactured by QST, designed for surface-mount applications in the 4-SMD, No Lead package with dimensions of 3.2mm x 2.5mm. It operates at a nominal frequency of 40 MHz with a typical supply voltage of 3.3V DC. The device features a maximum supply current of 10mA and supports an Enable/Disable function for power management. Frequency stability is rated at ±50ppm, ensuring reliable timing performance across the specified operating temperature range of -40°C to +85°C.

Feature Summary

• CMOS output signal compatible with standard digital logic interfaces
• Integrated enable/disable control functionality for dynamic power management
• Seam-sealed construction providing environmental protection and stability
• Compact 4-SMD no-lead footprint suitable for high-density PCB layouts

Applications

• Clock generation for microcontrollers and processors requiring precise timing
• Communication modules needing stable carrier frequencies
• Industrial control systems operating in wide temperature environments
• Consumer electronics utilizing low-power CMOS timing sources

Procurement Notes

Verify that the specific suffix 'MDE' corresponds to the required frequency tolerance and package variant, as QST uses distinct codes for different electrical specifications. Confirm that the 3.3V supply requirement aligns with your system design, as other variants may support different voltages. Ensure the Enable/Disable feature is utilized correctly in the schematic to avoid unnecessary power consumption during idle states. Cross-reference the datasheet for the latest lead times and RoHS compliance status before finalizing procurement orders.

Selection Notes

Select this component when a 40 MHz CMOS clock source with enable capability is required in a compact SMD form factor. Compare against the QTM325-40.000MBE-T if a different pinout or electrical characteristic is needed, as the suffix indicates specific functional differences. Consider the ±50ppm stability limit for applications sensitive to long-term drift. Evaluate the 10mA max current draw against total system power budgets compared to lower-current alternatives if efficiency is critical.

Part Context

This part belongs to the QST QTM325 series of surface-mount quartz oscillators, which are widely used in portable and industrial electronics. The series offers various frequencies and packages, with the 3.2x2.5mm size balancing performance and board space. The QTM325 line typically provides robust performance in harsh environments due to its sealed ceramic construction, making it a common choice for automotive and medical devices requiring reliable timing.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Verify compatibility with direct replacements from other manufacturers only after confirming identical electrical parameters, pin configurations, and thermal characteristics.