18QHTF21-109.640-PD

Overview

The 18QHTF21-109.640-PD is a standard crystal oscillator (XO) manufactured by Mercury Electronics Ind. Co. Ltd. It operates at a fixed frequency of 109.64 MHz and utilizes LVCMOS output logic levels. The device is designed for low voltage operation with a supply voltage of 1.8V. It features a power-down function, allowing the oscillator to enter a standby mode to reduce current consumption when not in active use. The component is housed in a compact 4-SMD, no lead package with dimensions of 2.0x1.6 mm, suitable for surface-mount applications requiring precise timing signals.

Feature Summary

• Generates a stable 109.64 MHz clock signal using LVCMOS interface
• Operates on a single 1.8V power supply rail
• Includes a power-down control pin for standby mode activation
• Utilizes a small-footprint 4-SMD no-lead package design

Applications

• Digital signal processing circuits requiring precise clock synchronization
• Communication systems utilizing LVCMOS compatible interfaces
• Portable electronic devices necessitating low-power standby modes
• Embedded systems with strict size constraints due to compact package

Procurement Notes

Verify that the specific part number includes the PD suffix, which denotes the power-down capability, as this affects functional behavior compared to standard variants. Confirm the operating temperature range requirements align with the datasheet specifications before finalizing procurement orders. Ensure compatibility with the 1.8V supply voltage provided by the target system design.

Selection Notes

Select this component when a 109.64 MHz frequency is strictly required alongside LVCMOS output compatibility. The choice is driven by the need for low voltage operation at 1.8V and the necessity of a power-down feature for energy management. The small 2.0x1.6 mm package makes it suitable for high-density PCB layouts where space is limited.

Part Context

This oscillator belongs to the Mercury Electronics 18QHTF21 series, which offers various frequencies within a standardized 4-SMD no-lead form factor. The series is characterized by its ability to provide stable clock signals for digital circuits while maintaining low power consumption profiles through optional standby functions.

Replacement Considerations

Direct replacements must match the 109.64 MHz frequency, 1.8V supply, LVCMOS output, and 4-SMD no-lead package dimensions. Verify if the substitute component supports the same power-down functionality indicated by the PD suffix.