18QHTF21-21.9487-PD

Oscillators Overview

The 18QHTF21-21.9487-PD is a standard crystal oscillator manufactured by Mercury Electronics Ind. Co. Ltd. It operates at a frequency of 21.9487 MHz and utilizes LVCMOS output logic. The device supports a supply voltage of 1.8V and includes a standby or power-down function for energy management. It is housed in a compact 4-SMD, No Lead package with dimensions of 2.0 x 1.6 mm.

Oscillators Feature Summary

• Supports low-voltage operation at 1.8V
• Integrates standby and power-down functionality
• Provides LVCMOS output signal compatibility

Oscillators Applications

• Digital clock signal generation
• Data communication interfaces
• Microcontroller system timing

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 voltage aligns with the system power rails. Ensure the 4-SMD no-lead package footprint matches the PCB layout specifications to guarantee proper soldering and mechanical stability during assembly.

Oscillators Selection Notes

Select this component when a precise 21.9487 MHz reference is required for LVCMOS-compatible digital circuits. The choice is driven by the need for low-power operation via the standby feature and the constraint of a small 2.0x1.6mm surface-mount footprint. Consider the operating temperature range and phase noise characteristics if high-frequency stability is critical for the application.

Oscillators Part Context

This model belongs to the 18QHTF21 series of surface-mount oscillators from Mercury Electronics. The series offers various frequencies within a standardized 4-SMD no-lead form factor. The suffix PD indicates the inclusion of power-down control capabilities, distinguishing it from continuous-operation variants within the same physical package family.

Oscillators Replacement Considerations

Direct replacements must match the 21.9487 MHz frequency, 1.8V supply, LVCMOS output, and 4-SMD no-lead package. Verify pinout compatibility and thermal characteristics. Cross-reference with other manufacturers offering identical electrical parameters and mechanical dimensions to ensure functional interchangeability without PCB redesign.