18QHTF21-6.789-OE

Overview

The 18QHTF21-6.789-OE is a standard crystal oscillator (XO) manufactured by Mercury Electronics Ind. Co. Ltd. It operates at a fixed frequency of 6.789 MHz and utilizes LVCMOS output logic. The device is designed for low-voltage applications, requiring a supply voltage of 1.8V. It features an enable/disable control function to manage power consumption. The component is housed in a compact 4-SMD, No Lead package with dimensions of 2.0mm x 1.6mm. It supports an operating temperature range suitable for general electronic equipment.

Feature Summary

• LVCMOS output logic provides standard digital interface compatibility
• Integrated enable/disable functionality allows for active power management
• Compact 4-SMD no-lead package design facilitates surface-mount assembly

Applications

• Portable consumer electronics requiring low-power timing sources
• Embedded systems utilizing 1.8V logic families
• Communication modules needing stable clock signals

Procurement Notes

Verify the specific suffix against official Mercury documentation to confirm exact electrical tolerances and packaging specifications. Ensure the selected variant matches the required operating temperature range and load capacitance for the target circuit design. Cross-reference the part number with authorized distributors to confirm availability and authenticity before finalizing procurement orders.

Selection Notes

Select this component when a 1.8V supply voltage is mandatory for the system architecture. The LVCMOS output is appropriate for direct interfacing with standard digital logic inputs without additional level shifting. Consider the physical footprint constraints, as the 2.0x1.6mm package requires specific PCB land pattern guidelines. Evaluate the enable pin requirements if dynamic power saving is a critical design parameter.

Part Context

This oscillator belongs to the QHTF series from Mercury Electronic, a supplier specializing in quartz crystals and timing devices. The series typically offers various frequencies within a small form factor. Mercury has established manufacturing capabilities in Taiwan since 1973, focusing on frequency control products including TCXOs and VCTCXOs alongside standard oscillators.

Replacement Considerations

Direct substitutes may include other 1.8V LVCMOS oscillators in 2.0x1.6mm packages from manufacturers such as Epson or SiTime. Verify that replacement parts match the 6.789 MHz frequency and support the same enable/disable control logic. Check for compatible load capacitance and drive strength specifications to ensure signal integrity.