18QHTF21-74.5855-PD

Overview

The 18QHTF21-74.5855-PD is a standard crystal oscillator manufactured by Mercury Electronics Ind. Co. Ltd. It operates at a fixed frequency of 74.5855 MHz and utilizes LVCMOS output logic. The device is designed for a supply voltage of 1.8V and features a standby or power-down function to reduce consumption when inactive. It is housed in a compact 4-SMD, No Lead package, suitable for surface-mount assembly on printed circuit boards.

Feature Summary

• Supports low-voltage operation at 1.8V with LVCMOS interface
• Includes standby mode capability for power management
• Utilizes a leadless SMD package for space-efficient mounting

Applications

• General-purpose clock signal generation in digital systems
• Timing reference for communication interfaces requiring 74.5855 MHz
• Embedded electronics utilizing low-power surface-mount components

Procurement Notes

Verify the specific frequency tolerance and load capacitance requirements against the system design specifications before procurement. Confirm that the 1.8V supply rail is stable and within the operational limits defined in the official datasheet. Ensure the PCB footprint matches the 4-SMD No Lead package dimensions to guarantee proper soldering and electrical connection during assembly.

Selection Notes

Select this component when a precise 74.5855 MHz timing source is required with low voltage compatibility. Consider the LVCMOS output swing levels to ensure compatibility with downstream logic inputs. Evaluate the thermal performance and operating temperature range to confirm suitability for the intended environmental conditions of the final application.

Part Context

This model belongs to the QHTF series of quartz oscillators from Mercury Electronics. The series typically offers standard frequency options with integrated stability. The 'PD' suffix indicates the inclusion of a power-down feature, distinguishing it from continuous-operation variants within the same family.

Replacement Considerations

Direct substitutes must match the 74.5855 MHz frequency, 1.8V supply, LVCMOS output, and 4-SMD No Lead package. Verify pinout compatibility and electrical characteristics such as phase noise and jitter if available in public documentation.