18QHTF21-49.4433-PD

Overview

The 18QHTF21-49.4433-PD is a standard crystal oscillator manufactured by Mercury Electronics Ind. Co., Ltd. It operates at a nominal frequency of 49.4433 MHz and utilizes LVCMOS output logic. The device functions with a supply voltage of 1.8V and includes a power-down feature for standby mode control. It is housed in a compact 4-SMD, no-lead package with dimensions of 2.0x1.6 mm. The component complies with RoHS standards and is designed for surface-mount applications requiring precise timing signals.

Feature Summary

• Integrates LVCMOS output logic for digital interface compatibility
• Supports active low power-down mode to reduce consumption during standby
• Utilizes a miniature 4-SMD no-lead surface-mount package design

Applications

• High-density digital circuit timing references
• Portable electronic devices requiring low power operation
• Communication modules needing stable clock signals

Procurement Notes

Verify the specific operating temperature range and load capacitance requirements against the official datasheet before integration. Confirm that the 1.8V supply voltage aligns with the target system's power rails. Ensure the PCB footprint matches the 2.0x1.6 mm SMD package dimensions precisely to avoid soldering defects. Check for any specific moisture sensitivity level handling instructions required during assembly.

Selection Notes

Select this component when a small form factor is critical for the design layout. The 1.8V supply requirement makes it suitable for modern low-voltage logic families. Consider the LVCMOS output swing if interfacing with different voltage domains. The power-down capability offers energy savings for battery-operated systems. Evaluate the 49.4433 MHz frequency necessity against available standard alternatives.

Part Context

This part belongs to the QHTF series of surface-mount crystal oscillators from Mercury Electronics. The series focuses on providing reliable timing solutions in compact packages. The 18QHTF21 variant specifically denotes the 1.8V supply and 2.0x1.6 mm size. These components are engineered for consumer electronics and industrial applications where space and power efficiency are prioritized over high-frequency stability ranges found in larger packages.

Replacement Considerations

Direct substitutes must match the 49.4433 MHz frequency, 1.8V supply, LVCMOS output, and 4-SMD 2.0x1.6mm package. Verify equivalent electrical parameters such as phase noise and startup time. Cross-reference pinout configurations to ensure compatibility with existing footprints.