QTM325-75.000MBD-T

Overview

The QTM325-75.000MBD-T is a surface-mount quartz crystal oscillator manufactured by QST. It operates at a nominal frequency of 75 MHz with a frequency stability of ±25 ppm and a maximum supply current of 5 mA. The device utilizes a 4-SMD, No Lead package measuring 3.2 mm x 2.5 mm. It supports a standard 3.3 V supply voltage and functions within an operating temperature range of -40°C to +85°C.

Feature Summary

• Standard XO output type for general clocking applications
• Compact 3.2mm x 2.5mm SMD footprint for space-constrained designs
• Industrial temperature rating for reliable operation in varied environments

Applications

• Microcontroller system clock generation
• Communication interface timing sources
• General-purpose digital circuit synchronization

Procurement Notes

Verify the specific suffix 'MBD' against the manufacturer's latest datasheet to confirm pinout configuration and electrical characteristics. Ensure the required frequency tolerance of ±25 ppm aligns with the target application's timing requirements. Confirm that the 3.3V supply voltage matches the system power rail before finalizing component selection.

Selection Notes

Select this component when a compact, low-power 75 MHz clock source is required for industrial-grade applications. It serves as a direct replacement for other 3225-sized oscillators with similar frequency and voltage specifications. Consider the ±25 ppm stability limit when designing circuits sensitive to long-term frequency drift or wide temperature variations.

Part Context

This part belongs to the QTM325 series of surface-mount crystal oscillators from QST. The series offers various frequencies and packages, providing designers with standardized timing solutions. The 325 designation typically refers to the 3.2mm x 2.5mm package size, distinguishing it from larger or smaller variants in the product line.

Replacement Considerations

Direct substitutes include other 3225 SMD oscillators from manufacturers like TXC or Epson offering 75MHz, 3.3V, and ±25ppm specs. Verify pin compatibility and output logic levels when cross-referencing with alternative brands to ensure seamless integration into existing PCB layouts.