18QHTF21-39.8485-PD

Oscillators Overview

The 18QHTF21-39.8485-PD is a standard crystal oscillator (XO) manufactured by Mercury Electronics Ind. Co. Ltd. It operates at a fixed frequency of 39.8485 MHz and utilizes LVCMOS output logic. The device is designed for low-voltage applications with a supply voltage of 1.8V. It features a standby mode for power-down functionality, enhancing energy efficiency in portable systems. The component is housed in a compact 4-SMD, No Lead package, suitable for surface-mount assembly. This specific model variant includes the '-PD' suffix indicating the power-down capability.

Oscillators Feature Summary

• LVCMOS output interface for digital logic compatibility
• Integrated standby mode for power management
• Compact 4-SMD no-lead surface mount package

Oscillators Applications

• Portable electronic devices requiring low power consumption
• Digital signal processing circuits
• Communication equipment clock sources

Oscillators Procurement Notes

Verify the exact part number including the '-PD' suffix to ensure the correct power-down feature is selected. Confirm that the 1.8V supply voltage aligns with the target system design. Check for RoHS compliance status if required by project specifications. Ensure the 4-SMD package dimensions fit within the PCB layout constraints. Validate the operating temperature range against environmental requirements.

Oscillators Selection Notes

Select this component when a precise 39.8485 MHz clock source is needed with minimal power usage. The LVCMOS output ensures direct interfacing with standard digital logic families without additional level shifting. The standby feature is critical for battery-operated applications where power conservation is a priority. Consider the small form factor for space-constrained designs.

Oscillators Part Context

This oscillator belongs to the QHTF series from Mercury Electronics, characterized by small footprints and low voltage operation. The '18' prefix typically denotes the 1.8V supply voltage requirement. The '21' likely refers to the package size or series identifier. The '-PD' designation distinguishes it from non-power-down variants like the '-OE' version which may offer enable pin control instead.

Oscillators Replacement Considerations

Direct substitutes include other 39.8485 MHz LVCMOS oscillators in similar SMD packages with 1.8V operation. Verify pinout compatibility and electrical parameters such as current consumption and stability before replacement. Cross-reference with Mercury Electronics datasheets for alternative part numbers within the same family.