18QHTF21-49.390-PD

Overview

The 18QHTF21-49.390-PD is a standard crystal oscillator manufactured by Mercury Electronics Ind. Co. Ltd. It operates at a nominal frequency of 49.39 MHz and utilizes LVCMOS output logic. The device is designed for low-power applications, featuring a supply voltage of 1.8V and a standby power-down mode. It is housed in a compact 4-SMD, no lead package with dimensions of 2.0 x 1.6 mm.

Feature Summary

• Supports standby power-down mode for energy efficiency
• Utilizes LVCMOS output logic interface
• Compact surface-mount package design

Applications

• General-purpose timing clock generation
• Low-voltage digital circuit synchronization
• Portable electronic devices requiring small form factor

Procurement Notes

Verify the specific frequency tolerance and load capacitance requirements against your system design before ordering. 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 to avoid assembly issues.

Selection Notes

Select this component when a precise 49.39 MHz reference signal is required for LVCMOS-compatible circuits. Consider the 1.8V operating voltage and standby capability if power management is critical. Evaluate the 2.0x1.6mm package size against available board space compared to larger oscillator options.

Part Context

This part belongs to the 18QHTF21 series from Mercury Electronics, which specializes in quartz-based timing solutions. The manufacturer has decades of experience in Taiwan's frequency control industry, producing crystals, oscillators, and filters. This series typically offers standard XO configurations suitable for various consumer and industrial electronics.

Replacement Considerations

Direct substitutes include other 49.39 MHz LVCMOS oscillators in 4-SMD packages with 1.8V operation. Verify pin compatibility and electrical specifications such as phase noise and stability before swapping manufacturers.