18QHTF21-25.811806-PD

Oscillators Overview

The 18QHTF21-25.811806-PD is a standard crystal oscillator (XO) manufactured by Mercury Electronics Ind. Co. Ltd. It operates at a nominal frequency of 25.811806 MHz and utilizes LVCMOS output logic. The device is designed for a supply voltage of 1.8V and features a standby or power-down mode capability. 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 functionality for power management
• Utilizes LVCMOS output interface

Oscillators Applications

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

Oscillators Procurement Notes

Verify the specific frequency tolerance and load capacitance requirements against the target circuit design before procurement. Ensure that the 1.8V supply rail is stable to maintain oscillator performance. Confirm that the PCB layout accommodates the 2.0x1.6mm SMD footprint and no-lead termination style to ensure proper soldering and mechanical reliability during assembly.

Oscillators Selection Notes

Select this component when a precise 25.811806 MHz clock source is required for LVCMOS-compatible digital logic. The choice is driven by the need for a small form factor suitable for dense PCB layouts. Consider the 1.8V operating voltage constraint and the availability of standby modes for power-sensitive applications. Verify compatibility with the host system's timing specifications.

Oscillators Part Context

This part belongs to the QHTF series of surface-mount crystal oscillators from Mercury Electronics. The series is characterized by its small physical dimensions and standardized LVCMOS outputs. The '18' prefix indicates the 1.8V supply voltage variant, while the 'PD' suffix typically denotes the packaging or tape-and-reel configuration. These components are engineered for high-frequency stability in consumer and industrial electronics.

Oscillators Replacement Considerations

Direct substitutes must match the 25.811806 MHz frequency, 1.8V supply, LVCMOS output, and 2.0x1.6mm package size. Cross-reference with other manufacturers offering similar SMD oscillators, ensuring identical pinout and electrical characteristics to guarantee functional interchangeability without redesign.