18QHTF21-39.8459-PD

Oscillators Overview

The 18QHTF21-39.8459-PD is a standard crystal oscillator (XO) manufactured by Mercury Electronics Ind. Co. Ltd. It operates at a nominal frequency of 39.8459 MHz and utilizes LVCMOS output logic. The device is designed for low voltage applications, supporting a supply voltage of 1.8V. It features a Standby mode for power down functionality to reduce energy consumption during inactive periods. The component is housed in a compact 4-SMD, No Lead package with dimensions of 2.0mm x 1.6mm, suitable for surface-mount assembly in space-constrained electronic designs.

Oscillators Feature Summary

• Supports LVCMOS output logic for standard digital interface compatibility
• Includes Standby mode capability for effective power management
• Utilizes a compact 4-SMD No Lead surface-mount package

Oscillators Applications

• General purpose clock signal generation in embedded systems
• Timing reference for low-voltage digital circuits
• Consumer electronics requiring compact oscillator solutions

Oscillators Procurement Notes

Verify the specific frequency tolerance and load capacitance requirements against the target circuit design before procurement. Confirm that the 1.8V supply voltage aligns with the system power rails. Ensure the PCB footprint matches the 2.0x1.6mm SMD package dimensions. Check for any specific reflow soldering profile recommendations provided by the manufacturer to ensure reliable assembly.

Oscillators Selection Notes

Select this component when a precise 39.8459 MHz clock source is required for LVCMOS-compatible logic families. Consider the 1.8V operating voltage as a primary constraint for power-sensitive applications. The small form factor makes it suitable for dense board layouts. Evaluate the need for standby functionality if power efficiency during idle states is a critical design parameter.

Oscillators Part Context

This part belongs to the 18QHTF21 series from Mercury Electronics, which focuses on low-profile crystal oscillators. The series typically offers various frequency options within a standardized 2.0x1.6mm package. The 'PD' suffix indicates the inclusion of a power-down or standby feature, distinguishing it from continuous-operation variants within the same physical footprint family.

Oscillators Replacement Considerations

Direct replacements must match the 39.8459 MHz frequency, 1.8V supply, LVCMOS output, and 4-SMD No Lead package. Verify pinout compatibility and electrical characteristics such as phase noise and jitter specifications. Cross-reference with other manufacturers offering similar low-profile XO components to ensure functional equivalence.