18QHTF21-21.948717-PD

Oscillators Overview

The 18QHTF21-21.948717-PD is a standard crystal oscillator (XO) manufactured by Mercury Electronics Ind. Co., Ltd. It operates at a fixed frequency of 21.948717 MHz and utilizes LVCMOS output logic. The device is designed for a supply voltage of 1.8V and features a standby power-down function to reduce consumption when inactive. It is housed in a compact 4-SMD, no-lead package with dimensions of 2.0mm x 1.6mm.

Oscillators Feature Summary

• Supports low-voltage operation at 1.8V
• Includes standby power-down capability
• Utilizes LVCMOS output interface

Oscillators Applications

• General-purpose clock signal generation
• Embedded system timing references
• Portable electronic devices requiring low power

Oscillators Procurement Notes

Verify the exact frequency tolerance and load capacitance requirements against your circuit design specifications before procurement. Confirm that the 1.8V supply voltage aligns with your system's power rails. Ensure the 4-SMD no-lead package footprint matches your PCB layout constraints. Check for any specific handling instructions regarding electrostatic discharge during assembly.

Oscillators Selection Notes

Select this component when a precise 21.948717 MHz clock source is required for LVCMOS-compatible digital circuits. The choice is driven by the need for a small form factor (2.0x1.6mm) and low power consumption via the standby feature. It is suitable for applications where space is limited and a dedicated oscillator solution is preferred over discrete components.

Oscillators Part Context

This part belongs to the 18QHTF21 series from Mercury Electronics, which offers various frequencies within a standardized 2.0x1.6mm SMD package. The series is characterized by its use of LVCMOS outputs and support for low-voltage operation. The suffix 'PD' indicates the inclusion of a power-down control pin, distinguishing it from continuous-output variants.

Oscillators Replacement Considerations

Direct replacements must match the 21.948717 MHz frequency, 1.8V supply, LVCMOS output, and 4-SMD 2.0x1.6mm package. Verify that substitute parts also include the power-down functionality if required by the design. Cross-reference pinouts and electrical characteristics to ensure compatibility.