18QHTF21-1.220-PD

Overview

The 18QHTF21-1.220-PD is a standard crystal oscillator manufactured by Mercury Electronics Ind. Co. Ltd. It operates at a frequency of 1.22 MHz with an LVCMOS output logic level. The device requires a 1.8V supply voltage and features a standby power-down mode for energy efficiency. Maximum supply current is specified at 21mA. The component is housed in a compact 4-SMD, no-lead package suitable for surface-mount applications.

Feature Summary

• Integrates a crystal base resonator within a standard XO configuration
• Supports low-voltage operation with dedicated standby functionality
• Provides LVCMOS signal output for digital interface compatibility

Applications

• Battery-powered portable electronic devices
• General-purpose clock signal generation
• Digital circuit timing references

Procurement Notes

Verify the specific frequency tolerance and load capacitance requirements against the official datasheet before integration. Confirm that the 1.8V supply rail stability meets the oscillator's operational specifications. Ensure the PCB layout accommodates the 4-SMD no-lead package dimensions to prevent mechanical stress or soldering defects during assembly.

Selection Notes

Select this component when a precise 1.22 MHz reference is required for low-power systems. The LVCMOS output ensures direct interfacing with standard digital logic families without additional buffering. Consider the 21mA maximum current draw for power budget calculations. The standby feature allows for significant power reduction in sleep modes compared to continuously running oscillators.

Part Context

This model belongs to the 18QHTF21 series of surface-mount crystal oscillators from Mercury Electronics. The series typically offers various frequency options within a standardized footprint. The PD suffix indicates specific packaging or handling characteristics defined by the manufacturer. These components are designed for high-reliability applications requiring stable clock signals in space-constrained environments.

Replacement Considerations

Direct substitutes include other 1.22 MHz LVCMOS oscillators in 4-SMD packages with compatible 1.8V supply voltages. Verify pinout compatibility and thermal performance metrics. Cross-reference absolute pull range specifications to ensure timing accuracy matches the original design requirements.