18QHTF21-58.495-PD

Overview

The 18QHTF21-58.495-PD is a standard crystal oscillator (XO) manufactured by Mercury Electronics Ind. Co. Ltd. It operates at a fixed frequency of 58.495 MHz and utilizes LVCMOS output logic levels. The device requires a 1.8V supply voltage and includes a standby or power-down control function for energy management. It is housed in a compact 4-SMD, no-lead package with dimensions of 2.0 x 1.6 mm. This component is designed for applications requiring precise timing signals within low-voltage digital systems.

Feature Summary

• LVCMOS output interface for direct compatibility with standard digital logic circuits
• Integrated standby mode allowing for power-down control to reduce consumption
• Compact 4-SMD no-lead surface mount package suitable for space-constrained designs

Applications

• Clock signal generation for microprocessors and microcontrollers
• Timing reference for communication interfaces such as UART, SPI, and I2C
• Synchronization sources for digital signal processing units

Procurement Notes

Verify the specific frequency tolerance and load capacitance requirements against your circuit design before ordering. Confirm that the 1.8V supply voltage aligns with your system's 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 reliability during assembly.

Selection Notes

Select this oscillator when a fixed 58.495 MHz clock source is required with LVCMOS compatibility. Consider the 1.8V operating voltage constraint and the need for a power-down feature. Evaluate the 4-SMD package size against available board space. Compare performance specifications such as phase noise and stability if critical for your application timing integrity.

Part Context

This part belongs to the 18QHTF21 series of surface-mount crystal oscillators from Mercury Electronics. The series offers various frequencies and voltage options, all sharing the same compact 2.0x1.6mm form factor. The 'PD' suffix indicates the inclusion of a power-down pin functionality. These components are part of Mercury's broader portfolio of frequency control products established since 1973.

Replacement Considerations

Direct replacements must match the 58.495 MHz frequency, 1.8V supply, LVCMOS output, and 4-SMD no-lead package. Verify pinout compatibility, especially the power-down control pin assignment. Cross-reference electrical parameters like start-up time and duty cycle with potential substitutes from other manufacturers.