18QHTF21-49.570-PD

Overview

The 18QHTF21-49.570-PD is a standard crystal oscillator manufactured by Mercury Electronics Ind. Co. Ltd. It operates at a nominal frequency of 49.57 MHz and utilizes LVCMOS output logic. The device functions with a supply voltage of 1.8V and includes a standby or power-down feature for energy management. It is housed in a compact 4-SMD, no-lead package with dimensions of 2.0x1.6 mm.

Feature Summary

• Supports low-voltage operation at 1.8V
• Integrates standby mode for power reduction
• Provides LVCMOS signal output compatibility

Applications

• Digital signal processing systems
• Communication equipment timing
• Embedded control circuits

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 package footprint matches the PCB layout constraints to guarantee proper soldering and mechanical stability during assembly.

Selection Notes

Select this component when a precise 49.57 MHz clock source is required for LVCMOS-compatible digital interfaces. Consider the 1.8V operating voltage and the availability of a power-down feature for applications prioritizing energy efficiency. Evaluate the small 2.0x1.6 mm form factor against available board space to ensure it fits within the designated area without interfering with adjacent components.

Part Context

This oscillator belongs to the 18QHTF21 series from Mercury Electronics, designed for surface-mount applications. The series typically offers various frequencies within the same compact package, allowing designers to maintain consistent board layouts across different product variants while adjusting only the frequency specification as needed for diverse timing requirements.

Replacement Considerations

Direct substitutes include other 49.57 MHz LVCMOS oscillators in 2.0x1.6mm packages with 1.8V operation. Verify pinout compatibility and electrical characteristics such as drive strength and rise/fall times to ensure seamless integration into existing designs without requiring schematic modifications.