18QHTF21-49.4333-PD

Overview

The 18QHTF21-49.4333-PD is a standard frequency crystal oscillator manufactured by Mercury Electronics Ind. Co. Ltd. It operates at a nominal frequency of 49.4333 MHz and utilizes LVCMOS output logic levels. The device is designed for low-voltage applications, functioning at a supply voltage of 1.8V. It features a compact surface-mount package with dimensions of 2.5x2.0 mm and includes a power-down (standby) mode capability to reduce energy consumption when not in active use.

Feature Summary

• Supports LVCMOS output signal compatibility
• Integrates standby power-down functionality
• Operates on a 1.8V single supply voltage

Applications

• Digital clock signal generation
• Data communication interface timing
• Microcontroller system clocks

Procurement Notes

Verify the specific operating temperature range and load capacitance requirements against the target circuit design before procurement. Confirm that the 1.8V supply voltage aligns with the host system's power rails. Ensure the 2.5x2.0 mm footprint matches the PCB layout constraints. Check for RoHS compliance status if environmental regulations apply to the final assembly.

Selection Notes

Select this component when a precise 49.4333 MHz reference is required for LVCMOS-compatible digital circuits. Consider the 1.8V operation for low-power embedded systems. Evaluate the physical size constraints against the available board space, as the 2.5x2.0 mm package is relatively small. Compare performance metrics such as phase noise and stability against other oscillators in the HUS or QHT series if higher precision is needed.

Part Context

This part belongs to the 18QHTF21 series from Mercury Electronics, which focuses on low-voltage crystal oscillators. The series typically offers various frequencies and package sizes, including 2.0x1.6 mm and 2.5x2.0 mm options. The 'PD' suffix indicates the inclusion of a power-down pin or function, distinguishing it from standard continuous-operation models within the same family.

Replacement Considerations

Direct substitutes include other 49.4333 MHz LVCMOS oscillators in 2.5x2.0 mm packages from manufacturers like Epson or NDK. Verify equivalent electrical parameters, specifically the 1.8V supply requirement and output drive strength. Ensure the replacement supports the same standby functionality if power management is critical to the application.