18QHTF21-84.644-PD

Overview

The 18QHTF21-84.644-PD is a standard crystal oscillator manufactured by Mercury Electronics Ind. Co. Ltd. It operates at a fixed frequency of 84.644 MHz and utilizes LVCMOS output logic. The device requires a supply voltage of 1.8V and features a standby power-down mode for energy efficiency. It is housed in a compact 4-SMD, no-lead package with dimensions of 2.0x1.6 mm.

Feature Summary

• LVCMOS output logic interface
• Integrated standby power-down capability
• Compact 4-SMD no-lead surface mount package

Applications

• Digital signal processing circuits
• Communication equipment clocking
• Embedded system timing references

Procurement Notes

Verify the specific frequency tolerance and load capacitance requirements against the official datasheet before procurement. Confirm that the 1.8V supply voltage aligns with the target circuit design. Ensure the 4-SMD no-lead package footprint matches the PCB layout specifications to guarantee proper soldering and mechanical stability during assembly.

Selection Notes

Select this component when a precise 84.644 MHz reference is required for low-voltage digital systems. The LVCMOS output ensures compatibility with standard logic families. Consider the power-down feature for applications requiring active management of power consumption. Verify thermal operating ranges meet environmental constraints.

Part Context

This part belongs to the Mercury Electronics 18QHTF21 series of surface-mount crystal oscillators. The series offers various frequencies within a standardized 2.0x1.6 mm package format. These components are designed for high-reliability timing applications in consumer electronics and industrial control systems where space constraints are critical.

Replacement Considerations

Direct substitutes include other 84.644 MHz LVCMOS oscillators in 4-SMD packages from compatible manufacturers. Ensure equivalent supply voltage and output drive strength. Cross-reference pinout configurations to maintain board compatibility without redesign.