18QHTF21-90.105-PD

Overview

The 18QHTF21-90.105-PD is a standard crystal oscillator manufactured by Mercury Electronics Ind. Co. Ltd. It operates at a nominal frequency of 90.105 MHz with an LVCMOS output logic level. The device supports a supply voltage of 1.8V and features a standby power-down mode for energy efficiency. It is housed in a compact 4-SMD, No Lead package suitable for surface mount applications. The unit exhibits a frequency stability of ±50ppm and functions within an operating temperature range of -40°C to 85°C. Maximum supply current is specified at 26mA.

Feature Summary

• Supports low-voltage operation at 1.8V with integrated standby power-down functionality
• Delivers standard LVCMOS output signals for digital interface compatibility
• Constructed in a small form factor 4-SMD no-lead package for space-constrained designs

Applications

• General clock generation for embedded systems
• Timing reference for communication interfaces
• Digital signal processing circuit synchronization

Procurement Notes

Verify the specific frequency tolerance and load capacitance requirements against the target circuit design before procurement. Confirm that the 1.8V supply rail can maintain stable regulation under maximum current conditions. Ensure the PCB layout accommodates the 4-SMD no-lead package dimensions and thermal relief requirements for reliable soldering during assembly processes.

Selection Notes

Select this component when a precise 90.105 MHz timing source is required for LVCMOS-compatible digital logic. Consider the ±50ppm stability specification relative to system jitter budgets. Evaluate the 1.8V supply constraint against available power rails. The wide industrial temperature range ensures suitability for environments subject to significant thermal fluctuations without performance degradation.

Part Context

This oscillator belongs to the 18QHTF21 series from Mercury Electronics, which specializes in quartz-based frequency control products. The manufacturer has decades of experience in producing crystals, TCXOs, and VCXOs. This specific model represents a standard XO variant designed for general-purpose timing applications requiring high reliability and compact packaging solutions for modern electronic assemblies.

Replacement Considerations

Direct substitutes include other 90.105 MHz LVCMOS oscillators in 4-SMD packages with compatible 1.8V supply voltages. Verify pinout compatibility and physical footprint alignment before substitution. Alternative models from different manufacturers must match the ±50ppm stability and -40°C to 85°C temperature range specifications to ensure functional equivalence.