18QHTF21-1.980-OE

Overview

The 18QHTF21-1.980-OE is a standard crystal oscillator manufactured by Mercury Electronics Ind. Co. Ltd. It operates at a frequency of 1.98 MHz and utilizes LVCMOS output logic. The device requires a supply voltage of 1.8V and features an enable/disable control function. It is housed in a compact 4-SMD, no lead package with dimensions of 2.0x1.6 mm. The component supports an operating temperature range from -40°C to 85°C and maintains a frequency stability of ±50ppm.

Feature Summary

• Integrates LVCMOS output logic for standard digital interface compatibility
• Includes hardware enable and disable control functionality
• Designed for low-voltage operation at 1.8V supply
• Utilizes a small form factor 4-SMD surface mount package

Applications

• General-purpose clock signal generation in embedded systems
• Timing reference sources for microcontrollers and processors
• Data communication interfaces requiring stable clock inputs
• Consumer electronics with space-constrained PCB layouts

Procurement Notes

Verify the specific frequency tolerance and load capacitance requirements against your circuit design before procurement. Ensure the 1.8V supply rail meets current consumption specifications during active and disabled states. Confirm that the 4-SMD footprint matches your PCB silkscreen and solder mask definitions to prevent assembly errors.

Selection Notes

Select this component when a precise 1.98 MHz timing source is required within tight spatial constraints. Consider the LVCMOS output swing levels to ensure compatibility with downstream logic families. Evaluate the thermal performance within the -40°C to 85°C range if the application involves extreme environmental conditions or high ambient temperatures.

Part Context

This oscillator belongs to the 18QHTF21 series from Mercury Electronics, which offers various frequency options in a standardized 2.0x1.6 mm package. The series provides consistent electrical characteristics across different frequencies, allowing designers to maintain uniform board layouts while adjusting timing parameters. The OE suffix indicates the presence of an enable pin for power management.

Replacement Considerations

Direct substitutes include other 1.98 MHz XO devices in 4-SMD packages with LVCMOS outputs and 1.8V operation. Verify pinout compatibility and electrical specifications such as phase noise and jitter before swapping. Alternative part numbers from the same manufacturer may offer different frequency stabilities or temperature ranges.