18QHTF21-120.200-PD

Overview

The 18QHTF21-120.200-PD is a standard crystal oscillator (XO) manufactured by Mercury Electronics Ind. Co. Ltd. It operates at a frequency of 120.2 MHz and utilizes LVCMOS output logic. The device is designed for a supply voltage of 1.8V and features a power-down standby mode to reduce consumption. It is housed in a compact 4-SMD, No Lead package with dimensions of 2.0x1.6 mm. This component serves as a precise clock source for digital circuits requiring low-profile packaging.

Feature Summary

• Supports LVCMOS output logic for direct interface with digital loads
• Includes a power-down standby function to minimize current draw when inactive
• Utilizes a small 4-SMD no-lead surface mount package for space-constrained designs

Applications

• High-speed data processing systems requiring precise timing
• Portable electronic devices with strict size limitations
• Communication equipment utilizing LVCMOS compatible interfaces

Procurement Notes

Verify the specific frequency suffix matches the required 120.2 MHz specification during ordering. Confirm that the 1.8V supply voltage aligns with the target system design. Ensure the 4-SMD package footprint corresponds to the PCB layout requirements. Check for any specific handling instructions related to the no-lead solder termination type.

Selection Notes

Select this model when a low-voltage 1.8V operation is mandatory for the application. Consider the 2.0x1.6 mm form factor if board real estate is limited compared to larger oscillators. Verify compatibility with LVCMOS input thresholds of the receiving circuitry. Evaluate the need for power-down functionality to meet overall system energy efficiency targets.

Part Context

This part belongs to the 18QHTF21 series from Mercury Electronics, which focuses on miniature crystal oscillators. The series typically offers various frequencies within a standardized small outline package. The 'PD' suffix indicates the inclusion of a power-down control feature, distinguishing it from continuous-operation variants in the same family.

Replacement Considerations

Direct substitutes must match the 120.2 MHz frequency, 1.8V supply, LVCMOS output, and 4-SMD 2.0x1.6mm package. Cross-referencing with other manufacturers requires verifying pinout compatibility and electrical parameter tolerances. Ensure the replacement supports the power-down function if that feature is critical to the design.