18QHTF21-66.650-PD

Overview

The 18QHTF21-66.650-PD is a standard crystal oscillator manufactured by Mercury Electronics Ind. Co. Ltd. It operates at a fixed frequency of 66.65 MHz and utilizes LVCMOS output logic. The device is designed for low-power applications, featuring a supply voltage of 1.8V and an integrated standby or power-down function to reduce energy consumption during idle periods. The component is housed in a compact 4-SMD, no-lead package with dimensions of 2.0mm by 1.6mm. It complies with RoHS standards, ensuring it is free from specific hazardous substances. This oscillator is suitable for digital circuits requiring precise clock signals within a small form factor.

Feature Summary

• Integrates LVCMOS output logic for direct interface with digital systems
• Includes standby mode capability for power reduction
• Complies with RoHS environmental directives

Applications

• Digital signal processing equipment
• Communication modules requiring precise timing
• Embedded systems with space constraints

Procurement Notes

Verify the specific frequency tolerance and load capacitance requirements against your circuit design before procurement. Confirm that the 1.8V supply voltage aligns with your system's power rails. Ensure the PCB footprint matches the 4-SMD no-lead package dimensions of 2.0x1.6mm. Check for any specific handling instructions regarding electrostatic discharge sensitivity during assembly.

Selection Notes

Select this component when a low-voltage, small-footprint clock source is required. The LVCMOS output is compatible with standard CMOS logic families. Consider the power-down feature if energy efficiency is critical. Compare physical dimensions against available board space. Verify operating temperature range suitability for the intended environment.

Part Context

This part belongs to the QHTF series of surface-mount oscillators from Mercury Electronics. The series offers various frequencies and voltages. The 'PD' suffix typically indicates the presence of a power-down control pin or function. Mercury Electronics is a specialized manufacturer of frequency control products with a long history in quartz crystal production.

Replacement Considerations

Direct replacements must match the 66.65 MHz frequency, 1.8V supply, LVCMOS output, and 2.0x1.6mm package size. Verify pinout compatibility, especially the power-down control functionality. Cross-reference with other manufacturers offering similar SMD oscillators, ensuring electrical parameters and mechanical dimensions are identical.