QTM750-33.33330MBB-T

Overview

The QTM750-33.33330MBB-T is a standard crystal oscillator manufactured by QST, designed for surface-mount applications. It operates at a nominal frequency of 33.3333 MHz with a frequency stability of 50 ppm across the industrial temperature range of -10°C to +70°C. The device utilizes CMOS output format and requires a supply voltage between 2.97 V and 3.63 V, typically centered at 3.3 V. It features an enable/disable control function via Pin 2, allowing for power management in system designs. The component is housed in a compact 4-SMD, No Lead package measuring 7.0 mm x 5.0 mm with a height of 1.3 mm.

Feature Summary

• CMOS output interface compatible with digital logic circuits
• Integrated enable/disable control functionality for power optimization
• Industrial temperature range operation from -10°C to +70°C
• Compact surface-mount package design for space-constrained layouts

Applications

• General-purpose clock signal generation in embedded systems
• Timing reference for microcontrollers and processors
• Communication interface synchronization modules
• Consumer electronics requiring stable frequency sources

Procurement Notes

Verify the specific suffix 'BB' against official QST documentation to confirm the exact voltage and stability specifications, as ordering codes can vary. Ensure the required operating temperature range aligns with the -10°C to +70°C specification provided. Confirm that the CMOS output level matches the input requirements of the destination circuit. Check for any recent product discontinuance notifications or lifecycle changes directly from the manufacturer before finalizing procurement plans.

Selection Notes

Select this component when a 33.3333 MHz clock source with 50 ppm stability is required for industrial environments. The integrated enable pin makes it suitable for battery-powered devices needing power management capabilities. Compare performance against other QTM750 variants if different voltage levels (1.8V, 2.5V, 5.0V) or tighter stability are needed. Ensure the PCB footprint matches the 7.0x5.0mm SMD no-lead package dimensions specified in the datasheet.

Part Context

This part belongs to the QTM750 series of standard oscillators from QST, which offers various frequencies and voltage options within the same physical footprint. The series is designed to provide reliable timing solutions for digital applications. The specific model indicates a 3.3V supply and standard stability, distinguishing it from higher-performance TCXO or VCXO variants in the broader QST portfolio.

Replacement Considerations

Direct substitutes may include other QTM750 series parts with identical frequency and package but different voltage or stability ratings, such as QTM750-33.333MDE-T if voltage compatibility allows. Verify pinout and electrical characteristics carefully when cross-referencing with generic 33.3333 MHz oscillators from other manufacturers.