18QHTF21-1.125-PD

Overview

The 18QHTF21-1.125-PD is a standard crystal oscillator (XO) manufactured by Mercury Electronics Ind. Co. Ltd. It operates at a frequency of 1.125 MHz and utilizes LVCMOS output logic. The device is designed for a supply voltage of 1.8V and includes a standby or power-down function to manage energy consumption. It is housed in a compact 4-SMD, No Lead package with dimensions of 2.0x1.6 mm. The component supports an operating temperature range suitable for general electronic applications.

Feature Summary

• Integrates LVCMOS output logic for standard digital interface compatibility
• Features a dedicated standby or power-down mode for energy efficiency
• Utilizes a leadless surface-mount package for space-constrained designs

Applications

• Battery-powered portable devices requiring low current consumption
• General-purpose clock signal generation in embedded systems
• Digital circuits utilizing LVCMOS logic standards

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's power rails. Ensure the PCB footprint matches the 4-SMD no-lead package dimensions provided in the official datasheet. Check for any specific reflow soldering profile recommendations to maintain component integrity during assembly.

Selection Notes

Select this component when a precise 1.125 MHz clock source is required for LVCMOS-compatible digital logic. The choice is driven by the need for a low-voltage 1.8V operation and the inclusion of a power-down feature to extend battery life in portable electronics. The small 2.0x1.6 mm form factor makes it suitable for high-density board layouts where space is limited compared to larger through-hole or standard SMD oscillators.

Part Context

This part belongs to the 18QHTF21 series from Mercury Electronics, which specializes in quartz crystal components. The manufacturer has a history of producing quartz crystals and oscillators. This specific model represents a standard XO variant within their portfolio, distinguished by its low voltage operation and compact surface-mount packaging suitable for modern consumer and industrial electronics.

Replacement Considerations

Direct substitutes include other 1.125 MHz LVCMOS oscillators in 4-SMD no-lead packages with 1.8V operation. Verify pinout compatibility and electrical specifications such as phase noise and jitter before substitution.