18QHTF21-49.4533-PD

Overview

The 18QHTF21-49.4533-PD is a fixed-frequency crystal oscillator manufactured by Mercury Electronics Ind. Co. Ltd. It operates at a standard frequency of 49.4533 MHz and utilizes LVCMOS output logic levels. The device functions with a supply voltage of 1.8V and includes a standby mode for power-down control. It is housed in a compact 4-SMD, No Lead package with dimensions of 2.0x1.6mm.

Feature Summary

• Supports low-voltage operation at 1.8V
• Integrates standby functionality for power management
• Delivers LVCMOS signal output compatibility

Applications

• Digital signal processing clocking
• Communication interface timing
• Embedded system microcontroller clocks

Procurement Notes

Verify the specific operating temperature range and load capacitance requirements against the target circuit design before procurement. Confirm that the 1.8V supply rail stability meets the oscillator's noise immunity specifications. Ensure the PCB footprint matches the 4-SMD No Lead package dimensions precisely to avoid soldering defects during assembly.

Selection Notes

Select this component when a precise 49.4533 MHz reference is required in space-constrained designs. The 1.8V voltage level makes it suitable for modern low-power digital logic families. Consider the small 2.0x1.6mm form factor for high-density board layouts where larger packages are impractical.

Part Context

This part belongs to the HFTF series of surface-mount oscillators from Mercury Electronics. It represents a shift from through-hole crystals to integrated solutions offering higher stability and ease of automated assembly. The series targets applications requiring reliable timing without external tuning components.

Replacement Considerations

Direct replacements must match the 49.4533 MHz frequency, 1.8V supply, LVCMOS output, and 4-SMD 2.0x1.6mm package. Verify pinout compatibility and thermal characteristics to ensure seamless integration into existing designs.