18QHTF21-6.660-PD

Overview

The 18QHTF21-6.660-PD is a standard crystal oscillator (XO) manufactured by Mercury Electronic Ind. Co., Ltd. It operates at a fixed frequency of 6.66 MHz and utilizes LVCMOS output logic. The device is designed for low-power applications, featuring a supply voltage of 1.8V and an integrated power-down function accessible via a standby control pin. The component is housed in a compact 4-SMD, no-lead package with dimensions of 2.0mm x 1.6mm. This specific model is part of the Mercury series optimized for portable electronics requiring precise timing signals with minimal current consumption.

Feature Summary

• Integrated power-down functionality for energy conservation
• LVCMOS output interface compatible with standard digital logic
• Compact surface-mount footprint suitable for space-constrained designs

Applications

• Battery-powered portable electronic devices
• Mobile communication equipment
• Consumer electronics requiring precise clock signals

Procurement Notes

Verify the exact frequency tolerance and load capacitance requirements against your circuit design specifications before procurement. Ensure that the 1.8V supply voltage aligns with your system's power rails. Confirm that the LVCMOS output levels are compatible with the receiving logic inputs to prevent signal integrity issues. Check the datasheet for operating temperature range limitations relevant to your deployment environment.

Selection Notes

Select this component when a low-voltage, low-power oscillator is required for portable applications. The 1.8V supply makes it suitable for battery-operated systems where energy efficiency is critical. The small 2.0x1.6mm package allows for high-density PCB layouts. Consider the power-down feature if the system requires periodic sleep modes to extend battery life. Ensure the 6.66 MHz frequency meets the specific timing needs of the target application.

Part Context

This oscillator belongs to Mercury Electronics' line of SMD crystal oscillators, which are known for their reliability in frequency control applications. The company has a long history in quartz crystal manufacturing, providing various timing solutions including TCXOs and VCTCXOs. The 18QHTF21 series is designed to meet the demands of modern electronics for smaller, more efficient timing components.

Replacement Considerations

Direct replacements must match the 6.66 MHz frequency, 1.8V supply voltage, LVCMOS output, and 4-SMD no-lead package dimensions. Verify that any substitute component offers similar power-down functionality and electrical characteristics to ensure seamless integration without circuit redesign.