QTM325-75.000MDE-T

Overview

The QTM325-75.000MDE-T is a standard CMOS quartz oscillator manufactured by QST, designed for surface-mount applications. It operates at a nominal frequency of 75 MHz with a supply voltage of 1.8V and exhibits a frequency stability of ±50 ppm across an operating temperature range of -40°C to +85°C. The component utilizes a compact 4-SMD, No Lead package measuring 3.20mm x 2.50mm in footprint with a maximum height of 1.0mm. This device provides a reliable clock signal for timing circuits requiring low-profile integration.

Feature Summary

• Generates a precise 75 MHz clock signal using CMOS output technology
• Operates on a single 1.8V power supply for low-power consumption
• Maintains frequency stability within ±50 ppm over the industrial temperature range
• Features a compact 3.2mm x 2.5mm surface-mount package for space-constrained designs

Applications

• High-speed digital logic timing references
• Microcontroller and microprocessor clock sources
• Communication interface synchronization circuits
• Data acquisition system timing generation

Procurement Notes

Verify the specific suffix 'MDE' confirms the 1.8V supply requirement and ±50 ppm stability, as variations exist within the QTM325 series. Ensure the ordering quantity aligns with manufacturer minimums and check lead times directly with authorized distributors. Confirm that the 4-SMD no-lead package dimensions match your PCB footprint requirements before finalizing procurement.

Selection Notes

Select this component when a 75 MHz reference is required with strict size constraints due to its 3.2x2.5mm form factor. The 1.8V operation makes it suitable for modern low-voltage logic families. Consider the ±50 ppm stability sufficient for general timing applications but verify against stricter jitter or aging specifications if used in high-precision communication links.

Part Context

This part belongs to the QTM325 series of surface-mount crystal oscillators from QST. The series offers various frequencies and voltage options, typically packaged in a 4-SMD no-lead configuration. The QTM325-75.000MDE-T specifically addresses the need for a 75 MHz clock in compact electronic assemblies, distinguishing itself through its small footprint and standardized CMOS output compatibility.

Replacement Considerations

Direct substitutes may include other 75 MHz 1.8V CMOS oscillators in 3.2x2.5mm packages from manufacturers such as TXC or Epson. Verify pinout compatibility and electrical parameters like ESR and load capacitance equivalents. Cross-reference datasheets to ensure thermal performance and start-up time meet the original design requirements.