18QHTF21-66.580-PD

Overview

The 18QHTF21-66.580-PD is a standard crystal oscillator (XO) manufactured by Mercury Electronic Ind. Co., Ltd. It operates at a fixed frequency of 66.58 MHz and utilizes LVCMOS output logic. The device functions with a supply voltage of 1.8V and includes a standby or power-down feature for energy management. It is housed in a compact 4-SMD, no-lead package with dimensions of 2.0 x 1.6 mm.

Feature Summary

• LVCMOS output logic interface
• Integrated standby and power-down functionality
• Compact 4-SMD no-lead surface mount package

Applications

• General clock signal generation in electronic circuits
• Low-power embedded systems requiring precise timing
• Consumer electronics utilizing LVCMOS compatible interfaces

Procurement Notes

Verify the specific frequency tolerance and load capacitance requirements against the target circuit design before procurement. Confirm that the 1.8V supply voltage aligns with the system's power rails. Ensure the 2.0x1.6mm footprint matches the PCB layout constraints. Check for any specific reflow soldering profile recommendations provided by the manufacturer to ensure component reliability during assembly.

Selection Notes

Select this component when a low-profile, 1.8V LVCMOS oscillator is required for space-constrained designs. The integrated standby mode makes it suitable for battery-operated applications where power efficiency is critical. Ensure the application does not require spread-spectrum capabilities, as this model is specified as a standard XO without such features.

Part Context

This part belongs to the 18QHTF series of surface-mount oscillators from Mercury Electronics. The series offers various frequencies and package sizes, with the 18QHTF21 variant specifically denoting the 2.0x1.6mm form factor. The suffix -PD indicates the inclusion of power-down control, distinguishing it from continuous-operation variants within the same physical package family.

Replacement Considerations

Direct replacements must match the 66.58 MHz frequency, 1.8V supply, LVCMOS output, and 4-SMD 2.0x1.6mm package. Verify that substitute parts support the standby function if power management is required. Cross-reference pinouts and electrical characteristics to ensure compatibility with existing circuitry.