18QHTF21-42.0778-PD

Oscillators Overview

The 18QHTF21-42.0778-PD is a standard crystal oscillator manufactured by Mercury Electronics Ind. Co. Ltd. It operates at a frequency of 42.0778 MHz with an LVCMOS output logic level. The device requires a supply voltage of 1.8V and features a power-down (Standby) control function. It is housed in a compact 4-SMD, No Lead package with dimensions of 2.0 x 1.6 mm.

Oscillators Feature Summary

• Supports Low Voltage CMOS (LVCMOS) output interface for digital circuit compatibility
• Includes standby or power-down functionality to reduce power consumption when inactive
• Utilizes a small form factor surface-mount package suitable for space-constrained designs

Oscillators Applications

• General clock signal generation for embedded systems
• Timing reference for communication interfaces requiring 42.0778 MHz
• Power-sensitive portable electronic devices utilizing 1.8V logic levels

Oscillators Procurement Notes

Verify the specific frequency tolerance and load capacitance requirements against your system design before procurement. Confirm that the 1.8V supply voltage aligns with your target platform's power rails. Ensure the 4-SMD no-lead package footprint matches your PCB layout constraints. Check for any specific reflow soldering profile recommendations provided by the manufacturer to ensure reliable assembly.

Oscillators Selection Notes

Select this component when a precise 42.0778 MHz timing source is required within a low-power environment. The 1.8V operating voltage makes it suitable for modern low-voltage digital logic families. Consider the integrated power-down feature if energy efficiency during idle states is a critical design parameter. Evaluate the physical size constraints to ensure the 2.0x1.6mm package fits within the available board area.

Oscillators Part Context

This part belongs to the 18QHTF21 series from Mercury Electronics, which specializes in quartz crystal frequency control products. The series typically offers various frequencies and packages tailored for consumer electronics and industrial applications. Mercury Electronics has established itself as a pioneer in the Taiwanese quartz crystal industry, providing reliable timing solutions since 1973.

Oscillators Replacement Considerations

Direct substitutes may include other 42.0778 MHz oscillators with LVCMOS outputs and 1.8V operation in a 4-SMD no-lead package. Verify pinout compatibility and electrical specifications such as phase noise and jitter before swapping. Alternative manufacturers should be evaluated based on similar package dimensions and functional equivalents.