18QHTF21-3.490-PD

Oscillators Overview

The 18QHTF21-3.490-PD is a standard crystal oscillator manufactured by Mercury Electronics Ind. Co. Ltd. It operates at a frequency of 3.49 MHz with LVCMOS output logic. The device supports a supply voltage of 1.8V and includes a standby power-down function. It is housed in a compact 4-SMD, No Lead package suitable for surface-mount applications.

Oscillators Feature Summary

• LVCMOS output logic interface
• Integrated standby power-down capability
• Compact 4-SMD no-lead surface mount package

Oscillators Applications

• General clock signal generation
• Digital circuit timing references
• Embedded system clock sources

Oscillators Procurement Notes

Verify the specific frequency tolerance and load capacitance requirements against the official datasheet before procurement. Confirm that the 1.8V supply voltage aligns with the target system design. Ensure the 4-SMD package footprint matches the PCB layout specifications to guarantee proper assembly and electrical connectivity.

Oscillators Selection Notes

Select this component when a low-voltage 1.8V operation is required alongside a standard LVCMOS interface. The choice is appropriate for space-constrained designs due to the small 4-SMD form factor. Consider the standby feature if power management during idle states is a priority for the application.

Oscillators Part Context

This part belongs to the Mercury Electronics XO series, which provides standard frequency control solutions. The model number indicates a 3.49 MHz output frequency. The suffix PD denotes the inclusion of a power-down pin or function, distinguishing it from continuous-operation variants within the same product family.

Oscillators Replacement Considerations

Direct substitutes must match the 3.49 MHz frequency, 1.8V supply, LVCMOS output, and 4-SMD package. Verify pin compatibility and thermal characteristics. Cross-reference with other manufacturers offering identical electrical parameters and mechanical dimensions to ensure seamless integration.