18QHTF21-7.555-PD

Overview

The 18QHTF21-7.555-PD is a standard crystal oscillator (XO) manufactured by Mercury Electronics Ind. Co. Ltd. It operates at a frequency of 7.555 MHz and utilizes LVCMOS output logic. The device supports a supply voltage of 1.8V and includes a standby or power-down function for energy management. It is housed in a compact 4-SMD, No Lead package with dimensions of 2.0x1.6mm.

Feature Summary

• Standard crystal oscillator configuration with LVCMOS output interface
• Integrated standby mode for power reduction
• Compact surface-mount package design

Applications

• General electronic timing circuits
• Digital signal processing systems
• Communication equipment clock sources

Procurement Notes

Verify the specific frequency tolerance and load capacitance requirements against the official datasheet before procurement. Confirm that the 1.8V supply voltage aligns with the target system's power rails. Ensure the 4-SMD no-lead package footprint matches the PCB layout specifications to guarantee proper soldering and mechanical stability during assembly.

Selection Notes

Select this component when a precise 7.555 MHz reference is required with low power consumption capabilities. The LVCMOS output ensures compatibility with standard digital logic families. Consider the 1.8V operating voltage constraint and the need for a standby feature to manage power efficiency in battery-operated or portable devices effectively.

Part Context

This part belongs to the 18QHTF21 series of surface-mount oscillators from Mercury Electronics. The series typically offers various frequencies within a small form factor. The 'PD' suffix indicates the inclusion of a power-down control pin, distinguishing it from continuous-operation variants within the same physical package family.

Replacement Considerations

Direct replacements must match the 7.555 MHz frequency, 1.8V supply, LVCMOS output, and 2.0x1.6mm 4-SMD package. Verify pinout compatibility and electrical characteristics such as phase noise and jitter against the original specification sheet to ensure functional equivalence.