18QHTF21-28.756-PD

Oscillators Overview

The 18QHTF21-28.756-PD is a standard crystal oscillator manufactured by Mercury Electronics Ind. Co. Ltd. It operates at a fixed frequency of 28.756 MHz and utilizes LVCMOS output logic. The device is designed for low-power applications, featuring a supply voltage of 1.8V and an integrated standby or power-down function to reduce energy consumption during idle periods. It is housed in a compact 4-SMD, No Lead package, suitable for surface-mount assembly processes. The component supports standard operating temperature ranges typical for commercial electronic equipment.

Oscillators Feature Summary

• LVCMOS output interface for digital signal compatibility
• Integrated standby mode for power management
• Surface-mount 4-SMD no lead package design

Oscillators Applications

• General purpose clock generation in consumer electronics
• Timing reference for microcontrollers and processors
• Communication module synchronization

Oscillators Procurement Notes

Verify the specific frequency tolerance and load capacitance requirements against the target circuit design before procurement. Confirm that the 1.8V supply rail is stable and within the operational limits specified in the official datasheet. Ensure the PCB footprint matches the 4-SMD no lead package dimensions to prevent assembly errors. Cross-reference the part number suffix with manufacturer documentation to confirm availability and revision status.

Oscillators Selection Notes

Select this component when a precise 28.756 MHz timing source is required for LVCMOS-compatible digital circuits. Consider the 1.8V supply constraint and the need for power-down functionality in battery-operated devices. Evaluate the thermal performance and size constraints of the 4-SMD package relative to the available board space. Compare against alternative frequencies if the system requires different clock speeds.

Oscillators Part Context

This oscillator belongs to the 18QHTF21 series from Mercury Electronics, which focuses on low-voltage, small-footprint timing solutions. The series is characterized by its use of quartz crystal technology for high stability. The 'PD' suffix typically indicates the inclusion of a power-down control feature, distinguishing it from standard continuous-operation variants within the same family.

Oscillators Replacement Considerations

Direct substitutes must match the 28.756 MHz frequency, LVCMOS output, 1.8V supply, and 4-SMD no lead package. Verify pinout compatibility and electrical characteristics such as rise/fall times and duty cycle. Consult the manufacturer's cross-reference list for approved replacements.