18QHTF21-19.657812-PD

Oscillators Overview

The 18QHTF21-19.657812-PD is a standard crystal oscillator (XO) manufactured by Mercury Electronics Ind. Co. Ltd. It operates at a frequency of 19.657812 MHz and utilizes LVCMOS output logic levels. The device is designed for a supply voltage of 1.8V and includes a power-down feature controlled via the PD suffix designation. It is housed in a compact 4-SMD, No Lead package with dimensions of 2.0x1.6 mm, suitable for surface-mount applications requiring precise timing signals.

Oscillators Feature Summary

• LVCMOS output interface for digital logic compatibility
• Integrated power-down control functionality
• Compact 4-SMD no-lead surface mount package

Oscillators Applications

• Digital signal processing clock sources
• Microcontroller system timing references
• Communication interface synchronization

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 rail stability meets the oscillator's operational specifications. Ensure the PCB footprint matches the 2.0x1.6 mm 4-SMD no-lead package dimensions to guarantee proper solder joint formation and mechanical reliability during assembly processes.

Oscillators Selection Notes

Select this component when a low-voltage 1.8V operation is required alongside a standard LVCMOS output format. The integrated power-down capability makes it suitable for battery-powered or energy-efficient systems where standby current reduction is critical. The small form factor supports high-density board layouts in portable electronic devices and compact industrial modules.

Oscillators Part Context

This part belongs to the 18QHTF21 series from Mercury Electronics, which specializes in quartz crystal frequency control products. The manufacturer has decades of experience in Taiwan's crystal industry. The series offers various frequencies and supply voltages, with the PD suffix indicating power-down support and OE indicating enable/disable control.

Oscillators Replacement Considerations

Direct replacements include other 18QHTF21 variants with matching 1.8V supply and LVCMOS outputs, such as the 18QHTF21-19.657812-OE if enable/disable control is preferred over power-down. Cross-reference with other manufacturers offering 2.0x1.6mm 4-SMD XO packages with identical frequency and voltage specifications.