18QHTF21-49.000-PD

Overview

The 18QHTF21-49.000-PD is a standard crystal oscillator manufactured by Mercury Electronics Ind. Co. Ltd. It operates at a frequency of 49 MHz and utilizes LVCMOS output logic. The device supports a supply voltage of 1.8V and includes a standby or power-down function for energy management. It is housed in a compact 4-SMD, No Lead surface-mount package with dimensions of 2.00mm x 1.60mm.

Feature Summary

• Integrates LVCMOS output logic for digital interface compatibility
• Features a dedicated standby mode to reduce power consumption
• Utilizes a leadless surface-mount package for space efficiency

Applications

• General clock signal generation in embedded systems
• Timing reference for digital communication interfaces
• Power-sensitive portable electronic devices

Procurement Notes

Verify the specific operating temperature range and load capacitance requirements against the target circuit design. Confirm that the 1.8V supply voltage aligns with the system's power rails. Ensure the 4-SMD footprint matches the PCB land pattern. Check for any specific handling instructions regarding electrostatic discharge sensitivity during assembly.

Selection Notes

Select this component when a precise 49 MHz timing source is required in a low-voltage environment. The choice is driven by the need for LVCMOS compatibility and the availability of a power-down feature. Consider the small form factor suitable for dense board layouts. Validate that the manufacturer's frequency tolerance meets the system's jitter and stability specifications.

Part Context

This part belongs to the 18QHTF21 series of surface-mount oscillators from Mercury Electronics. The series typically offers various frequencies within the same physical footprint. The 'PD' suffix indicates the inclusion of a power-down control pin. This family is designed for applications requiring stable clock signals in compact consumer and industrial electronics.

Replacement Considerations

Direct substitutes include other 49 MHz LVCMOS oscillators in a 2.0x1.6mm package with 1.8V operation. Verify pinout compatibility, specifically the power-down pin assignment. Ensure equivalent frequency stability and phase noise characteristics are maintained in the new component.