18QHTF21-49.408-PD

Overview

The 18QHTF21-49.408-PD is a standard crystal oscillator manufactured by Mercury Electronics Ind. Co. Ltd. It operates at a nominal frequency of 49.408 MHz with LVCMOS output logic. The device requires a supply voltage of 1.8V and features a power-down function for standby mode control. It is housed in a compact 4-SMD, no-lead package measuring 2.0mm by 1.6mm. The component supports an operating temperature range suitable for industrial applications.

Feature Summary

• Provides stable clock signals via LVCMOS output interface
• Includes power-down capability to reduce consumption during standby
• Utilizes surface-mount packaging for automated assembly

Applications

• Digital signal processing circuits requiring precise timing
• Communication systems utilizing standard clock frequencies
• Embedded controller boards needing low-profile oscillators

Procurement Notes

Verify the specific voltage tolerance and load requirements against the target circuit design before integration. Confirm that the 1.8V supply rail is stable and within specification limits. Ensure the PCB footprint matches the 4-SMD no-lead dimensions exactly to prevent soldering defects. Check for any RoHS compliance documentation if required by regional regulations.

Selection Notes

Choose this model when a 49.408 MHz frequency is specifically required rather than a standard value. The 1.8V supply requirement dictates compatibility with low-voltage logic families. The small 2.0x1.6mm form factor is ideal for space-constrained designs. Consider the power-down feature if energy efficiency during idle states is a priority for the system architecture.

Part Context

This component belongs to the HFTF series of surface-mount crystal oscillators from Mercury Electronics. It represents a standard output type designed for general-purpose timing applications. The part number indicates the specific frequency and voltage configuration within the product line.

Replacement Considerations

Direct substitutes must match the 49.408 MHz frequency, 1.8V supply, LVCMOS output, and 4-SMD 2.0x1.6mm package. Verify pinout compatibility and thermal characteristics before swapping manufacturers.