18QHTF21-6.789-PD

Overview

The 18QHTF21-6.789-PD is a crystal oscillator (XO) manufactured by Mercury Electronic Ind. Co., Ltd. It operates at a nominal frequency of 6.789 MHz and utilizes LVCMOS output logic. The device is designed for a supply voltage of 1.8V and features a standby or power-down function to manage energy consumption. It is housed in a compact 4-SMD, No Lead package with dimensions of 2.0mm x 1.6mm. This component is engineered for timing applications requiring precise clock signals in space-constrained electronic designs.

Feature Summary

• Integrated standby mode for power management
• Compact surface-mount footprint
• LVCMOS compatible output interface

Applications

• Battery-powered portable devices
• Space-constrained embedded systems
• General timing clock generation

Procurement Notes

Verify the specific ordering suffix against official manufacturer documentation to ensure correct voltage levels and output logic compatibility. Confirm that the selected variant matches the required operating temperature range and package dimensions for your PCB layout. Cross-reference the part number with authorized distributors to validate authenticity and avoid counterfeit components. Ensure all electrical specifications align with the target system requirements before finalizing procurement orders.

Selection Notes

Select this component when a low-voltage 1.8V operation is required alongside a small form factor. Consider the LVCMOS output compatibility with downstream digital logic circuits. Evaluate the need for power-down functionality to extend battery life in portable applications. Verify that the 6.789 MHz frequency meets the system clock requirements without additional frequency synthesis stages.

Part Context

Mercury Electronic Ind. Co., Ltd. is a Taiwan-based manufacturer specializing in frequency control products, including quartz crystals and oscillators. The company has a history dating back to 1973, focusing on precision timing solutions. The 18QHTF21 series represents their line of surface-mount crystal oscillators designed for modern electronics requiring reliable clock sources in compact packages.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided source data. Consult official Mercury Electronics documentation for direct replacements or cross-reference with other manufacturers offering similar 1.8V, 6.789 MHz XO specifications in a 2.0x1.6mm package.