QTT325-16.3676MBG-T

Overview

The QTT325-16.3676MBG-T is a temperature-compensated crystal oscillator (TCXO) manufactured by QST, operating at a nominal frequency of 16.3676 MHz. It delivers a clipped sine wave output signal and requires a 3.3V supply voltage. The device exhibits a frequency stability of ±500 ppb across its operational range. Designed for surface-mount applications, it utilizes a compact 4-SMD, no-lead package configuration. The component supports an operating temperature range from -30°C to +85°C, ensuring reliable performance in demanding thermal environments while maintaining precise timing signals.

Feature Summary

• Temperature compensation mechanism ensures stable frequency output across varying thermal conditions
• Compact four-terminal surface-mount package design facilitates automated assembly processes
• Clipped sine wave output mode provides standardized signal characteristics for downstream circuitry

Applications

• Precision timing reference systems requiring high frequency stability
• Telecommunications equipment utilizing specific carrier frequencies
• Industrial control modules operating within extended temperature ranges

Procurement Notes

Verify the exact frequency specification of 16.3676 MHz against system requirements before procurement. Confirm that the clipped sine wave output type matches the input impedance and logic levels of the receiving circuit. Ensure the 3.3V supply voltage aligns with the power distribution network. Validate the 4-SMD package dimensions against the PCB footprint to prevent mechanical interference during installation.

Selection Notes

Select this component when a specific non-standard frequency of 16.3676 MHz is required rather than common integer values. Consider the ±500 ppb stability requirement relative to other TCXO options available in the market. Evaluate the need for a clipped sine wave output versus square wave alternatives based on harmonic content requirements. Assess the thermal environment to ensure the -30°C to +85°C range covers all operational extremes without derating concerns.

Part Context

This part belongs to the QTT325 series of temperature-compensated crystal oscillators from QST. The series offers various frequency options within similar package constraints. The suffix indicates specific frequency and output characteristics. Similar parts in the lineup include variants with different frequencies such as 16.368 MHz or 25.000 MHz, sharing identical electrical and mechanical form factors for platform compatibility.

Replacement Considerations

Direct substitutes may include other QTT325 series variants if frequency adjustments are permissible. Cross-manufacturer replacements require matching the 4-SMD no-lead package and 3.3V supply. Verify that alternative sources support the clipped sine wave output and ±500 ppb stability metric to maintain system timing integrity.