18QHTF21-1.250-PD

Overview

The 18QHTF21-1.250-PD is a crystal oscillator manufactured by Mercury Electronics Ind. Co. Ltd, operating at a frequency of 1.25 MHz. It utilizes LVCMOS output logic and functions with a supply voltage of 1.8V. The device features a Standby (Power Down) control mode for power management. It is housed in a compact 4-SMD, No Lead package, suitable for surface-mount applications requiring precise timing signals.

Feature Summary

• Supports LVCMOS output interface
• Includes Standby (Power Down) functionality
• Operates on 1.8V supply voltage

Applications

• General-purpose digital timing circuits
• Embedded systems requiring low-frequency clock sources
• Portable electronic devices utilizing 1.8V logic levels

Procurement Notes

Verify the specific frequency tolerance and load capacitance requirements against your circuit design before procurement. Confirm that the 1.8V supply voltage aligns with your system's power rails. Ensure the 4-SMD No Lead package footprint matches your PCB layout constraints. Cross-reference the manufacturer's datasheet for absolute maximum ratings to prevent operational damage.

Selection Notes

Select this component when a stable 1.25 MHz clock signal is required for 1.8V logic systems. The integrated standby feature makes it suitable for battery-powered applications where power conservation is critical. Consider the physical dimensions of the 4-SMD package during mechanical design integration. Validate compatibility with downstream logic inputs regarding voltage thresholds.

Part Context

This part belongs to the 18QHTF21 series of standard crystal oscillators from Mercury Electronics. The series offers various frequencies with consistent LVCMOS outputs and 1.8V operation. The 'PD' suffix indicates the inclusion of a power-down pin, allowing for active power management. This family is designed for compact electronics needing reliable timing solutions.

Replacement Considerations

Direct substitutes within the same series include other frequency variants such as 18QHTF21-1.8432-PD or 18QHTF21-2.048-PD if frequency adjustments are permissible. Ensure any replacement maintains the 1.8V supply requirement and LVCMOS output characteristics. Verify package compatibility for direct board replacement.