18QHTF21-64.4475-PD

Overview

The 18QHTF21-64.4475-PD is a standard crystal oscillator manufactured by Mercury Electronic Ind. Co., Ltd. It operates at a fixed frequency of 64.4475 MHz and utilizes LVCMOS output logic levels. The device is designed for low-power applications, featuring a supply voltage of 1.8V and a standby mode for power-down functionality. It is housed in a compact 4-SMD, No Lead package, suitable for surface-mount assembly. The component supports an operating temperature range of -40°C to +85°C with a frequency stability of ±50ppm.

Feature Summary

• Supports standby mode for power-down operation
• Utilizes LVCMOS output logic interface
• Compact 4-SMD no-lead surface mount package

Applications

• General-purpose timing clock generation
• Low-voltage digital circuit synchronization
• Portable electronic devices requiring power efficiency

Procurement Notes

Verify the specific frequency tolerance and load capacitance requirements against your design specifications before procurement. Ensure that the 1.8V supply voltage aligns with your system's power rails. Confirm that the 4-SMD package dimensions fit within your PCB layout constraints. Cross-reference the datasheet for absolute maximum ratings to prevent operational damage during integration.

Selection Notes

Select this component when a precise 64.4475 MHz reference is required for LVCMOS-compatible circuits. Consider the ±50ppm stability for applications sensitive to minor frequency drift. The 1.8V supply requirement makes it suitable for modern low-power systems. Evaluate the thermal performance within the -40°C to +85°C range to ensure reliability under varying environmental conditions.

Part Context

This oscillator belongs to the Mercury Electronics 18QHTF series, which focuses on low-voltage, high-reliability timing solutions. The series is characterized by its small form factor and compatibility with standard surface-mount processes. Mercury Electronics leverages decades of quartz crystal manufacturing expertise to produce these components, ensuring consistent performance across various industrial and consumer electronics applications.

Replacement Considerations

Direct substitutes must match the 64.4475 MHz frequency, LVCMOS output, 1.8V supply, and 4-SMD package. Verify pinout compatibility and thermal characteristics. Check manufacturer-specific tolerances for frequency stability and operating temperature ranges to ensure functional equivalence without redesigning the host circuit.