18QHTF21-104.2542-PD

Overview

The 18QHTF21-104.2542-PD is a standard crystal oscillator (XO) manufactured by Mercury Electronics Ind. Co. Ltd. It operates at a fixed frequency of 104.2542 MHz and utilizes LVCMOS output logic. The device requires a 1.8V supply voltage and includes a standby or power-down control function for energy management. It is housed in a compact 4-SMD, no lead package with dimensions of 2.0mm x 1.6mm, designed for surface-mount applications.

Feature Summary

• LVCMOS output interface for digital compatibility
• Integrated standby/power-down functionality
• Compact 4-SMD no-lead surface mount package

Applications

• General purpose clock generation
• Digital signal processing systems
• Communication equipment timing

Procurement Notes

Verify the specific ordering suffix to ensure the correct package variant and termination finish are selected. Confirm that the 1.8V supply voltage aligns with the target system design requirements. Check the datasheet for precise operating temperature ranges and load capacitance specifications before integration into final assemblies.

Selection Notes

Select this component when a 104.2542 MHz reference signal is required with low voltage operation. The LVCMOS output is suitable for direct interfacing with standard digital logic families. Ensure the PCB layout accommodates the small 2.0x1.6mm footprint and provides adequate thermal relief for the SMD package.

Part Context

This part belongs to the QHTF series of high-frequency oscillators from Mercury Electronics. The series offers various frequencies and voltage options, including 2.5V variants like the 25QHTF21 model. The 'PD' suffix typically indicates the inclusion of a power-down pin for standby control capabilities.

Replacement Considerations

Direct substitutes may include other 104.2542 MHz LVCMOS oscillators in a 4-SMD no-lead package. Verify voltage tolerance and pinout compatibility before substitution. Cross-reference with similar Mercury models such as the 18QHTF21 series for alternative frequency options if exact matching is not possible.