18QHTF21-12.289-PD

Overview

The 18QHTF21-12.289-PD is a standard crystal oscillator manufactured by Mercury Electronics Ind. Co. Ltd. It operates at a fixed frequency of 12.289 MHz and utilizes LVCMOS output logic. The device functions with a supply voltage of 1.8V and includes a standby or power-down capability for energy management. It is housed in a compact 4-SMD, no lead package with dimensions of 2.0x1.6mm. The component is designed for timing applications requiring precise clock signals within the specified operating temperature range.

Feature Summary

• LVCMOS output logic for digital interface compatibility
• Integrated standby mode for power reduction
• Compact surface-mount form factor

Applications

• Digital signal processing clock generation
• Microcontroller system timing
• Communication interface synchronization

Procurement Notes

Verify the specific frequency tolerance and load capacitance requirements against the official datasheet before integration. Confirm that the 1.8V supply voltage aligns with the target circuit design. Ensure the 4-SMD package footprint matches the PCB layout constraints. Check for any specific ordering suffixes that may alter electrical characteristics or packaging details.

Selection Notes

Select this component when a low-voltage 1.8V operation is required alongside a standard LVCMOS output. The small 2.0x1.6mm package makes it suitable for space-constrained designs. Consider the power-down feature if battery life or thermal management is a priority. Validate that the 12.289 MHz frequency meets the system's clocking needs without additional dividers.

Part Context

This part belongs to the 18QHTF21 series from Mercury Electronics, which offers various frequencies in a standardized small outline package. The series typically supports LVCMOS outputs and low voltage operations. The 'PD' suffix indicates the inclusion of a power-down function. This family is designed for general-purpose timing applications in consumer and industrial electronics.

Replacement Considerations

Direct substitutes include other 18QHTF21 variants with identical pinout and package but different frequencies, such as 18QHTF21-51.200-PD or 18QHTF21-96.768-PD, provided the frequency difference is acceptable. Cross-brand replacements require matching LVCMOS logic, 1.8V supply, and 2.0x1.6mm SMD dimensions.