18QHTF21-26.991-PD

Oscillators Overview

The 18QHTF21-26.991-PD is a standard crystal oscillator manufactured by Mercury Electronics Ind. Co., Ltd. It operates at a frequency of 26.991 MHz and utilizes LVCMOS output logic. The device supports a supply voltage of 1.8V and includes a standby (power down) function for energy management. It is housed in a compact 4-SMD, No Lead package, suitable for surface-mount applications.

Oscillators Feature Summary

• Integrates LVCMOS output logic for digital signal compatibility
• Features a standby mode to reduce power consumption during idle periods
• Utilizes a leadless SMD package for automated assembly integration

Oscillators Applications

• General purpose clock generation in embedded systems
• Timing reference for microcontroller units
• Data communication interface synchronization

Oscillators Procurement Notes

Verify the specific frequency tolerance and load capacitance requirements against the system design specifications before procurement. Confirm that the 1.8V supply voltage aligns with the target circuit's power rails. Ensure the 4-SMD no-lead footprint matches the PCB land pattern to guarantee proper solder joint formation and mechanical stability during operation.

Oscillators Selection Notes

Select this component when a precise 26.991 MHz timing source is required for low-power digital circuits. The LVCMOS output ensures direct interfacing with standard logic families without additional buffering. The inclusion of a power-down feature makes it suitable for battery-operated devices where standby current reduction is critical for extending operational life.

Oscillators Part Context

This part belongs to the 18QHTF21 series of quartz crystal oscillators from Mercury Electronics. The series is characterized by small form factors and standardized output levels. The suffix PD indicates the presence of a power-down control capability, distinguishing it from continuous-operation variants within the same family.

Oscillators Replacement Considerations

Direct substitutes must match the 26.991 MHz frequency, 1.8V supply, LVCMOS output, and 4-SMD package. Verify pinout compatibility and thermal characteristics. Cross-reference with other manufacturers' 3225 or similar sized oscillators offering identical electrical parameters.