18QHTF21-11.500-PD

Overview

The 18QHTF21-11.500-PD is a standard crystal oscillator (XO) manufactured by Mercury Electronics Ind. Co. Ltd, designed for surface-mount applications. It operates at a fixed frequency of 11.500 MHz and utilizes LVCMOS output logic levels. The device is powered by a single 1.8V supply voltage and includes a standby or power-down control feature to manage energy consumption during inactive periods. The component is housed in a compact 4-SMD, No Lead package, specifically identified as a 4-VDFN with dimensions of 3.2x2.5 mm. This configuration supports automated assembly processes while maintaining reliable signal integrity for digital clocking requirements.

Feature Summary

• Supports low-voltage operation with a 1.8V supply requirement
• Integrates power-down functionality for standby mode management
• Provides LVCMOS output compatibility for direct digital interfacing
• Utilizes a compact 4-pin surface-mount package design

Applications

• Digital system clock generation
• Data communication interface timing
• Embedded processor clock sources
• Consumer electronics timing circuits

Procurement Notes

Verify the specific ordering suffix against the manufacturer's current documentation to ensure the correct frequency tolerance and load capacitance specifications are met for your design. Confirm that the 1.8V supply rail matches the oscillator's electrical requirements before integration. Check for any recent updates to the pinout or thermal characteristics in the latest datasheet revision to avoid compatibility issues during procurement and assembly.

Selection Notes

Select this component when a precise 11.500 MHz clock source is required for low-power digital applications. The choice depends on the necessity for LVCMOS outputs and the availability of a 1.8V power domain. Consider the physical constraints of the 4-SMD No Lead package for PCB layout space limitations. Ensure the application does not require spread-spectrum capabilities or higher voltage operation, which would necessitate different model variants within the series.

Part Context

This part belongs to the 18QHTF21 series of standard crystal oscillators from Mercury Electronics Ind. Co. Ltd. The series offers various frequency options and voltage levels, all sharing the same compact 4-SMD form factor. The 'PD' suffix indicates the inclusion of a power-down control pin, distinguishing it from continuous-operation variants. Mercury Electronics specializes in quartz-based frequency control products, providing these oscillators for industrial and consumer electronic markets.

Replacement Considerations

Direct replacements must match the 11.500 MHz frequency, 1.8V supply, LVCMOS output, and 4-SMD No Lead package dimensions. Verify equivalent performance metrics such as phase noise and stability if available in public data. Cross-reference with other manufacturers offering identical pinouts and electrical specifications to ensure functional interchangeability without redesigning the host circuit board.