18QHTF21-1.647-OE

Overview

The 18QHTF21-1.647-OE is a standard crystal oscillator (XO) manufactured by Mercury Electronics Ind. Co. Ltd. It operates at a fixed frequency of 1.647 MHz and utilizes LVCMOS output logic. The device is designed for a supply voltage of 1.8V and features an active enable/disable control function. It is housed in a compact 4-SMD, No Lead package with dimensions of 2.0mm x 1.6mm.

Feature Summary

• Integrates LVCMOS output logic for direct digital interface compatibility
• Includes hardware enable and disable pin for power management control
• Utilizes a leadless surface-mount package for automated assembly

Applications

• Clock signal generation for low-frequency microcontrollers
• Timing reference for simple serial communication interfaces
• Power-sensitive embedded system designs requiring 1.8V operation

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 2.0x1.6mm SMD no-lead package dimensions to prevent soldering defects during assembly.

Selection Notes

Select this component when a precise 1.647 MHz timing source is required for 1.8V logic systems. Consider the enable/disable feature if power conservation is critical. Evaluate the small form factor against available board space constraints. Compare performance against other Mercury oscillators if different frequencies or voltage levels are needed.

Part Context

This part belongs to the 18QHTF21 series from Mercury Electronic Ind. Co., Ltd, a supplier specializing in quartz crystals and oscillators. The series typically offers various frequencies within a standardized 2.0x1.6mm package. This specific model represents a low-frequency option suitable for basic timing applications rather than high-speed data processing.

Replacement Considerations

Direct substitutes must match the 1.647 MHz frequency, 1.8V supply, LVCMOS output, and 4-SMD no-lead package. Verify pinout compatibility for the enable pin. Cross-reference with other manufacturers offering identical electrical specifications and mechanical dimensions.