18QHTF21-1.8435-PD

Overview

The 18QHTF21-1.8435-PD is a standard crystal oscillator (XO) manufactured by Mercury Electronics Ind. Co., Ltd. It operates at a frequency of 1.8435 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 management and is housed in a compact 4-SMD, No Lead package. The component supports an operating temperature range suitable for general electronic environments.

Feature Summary

• Supports LVCMOS output logic for digital interface compatibility
• Includes standby function to reduce power consumption during idle states
• Utilizes a surface-mount 4-SMD no-lead package for automated assembly

Applications

• Battery-powered portable devices requiring low current draw
• Digital signal processing circuits needing precise clock references
• Embedded systems utilizing low-voltage microcontrollers

Procurement Notes

Verify the specific frequency tolerance and load capacitance requirements against the system design specifications before procurement. Confirm that the 1.8V supply voltage aligns with the target circuit's power rails. Ensure the 4-SMD footprint matches the PCB layout constraints. Check for any specific RoHS compliance documentation if required by the manufacturing process.

Selection Notes

Select this component when a low-voltage, low-power clock source is required for digital logic interfaces. The LVCMOS output is suitable for direct connection to CMOS-compatible inputs without additional level shifting. Consider the thermal characteristics and operating temperature range to ensure reliability under expected environmental conditions. Verify the package dimensions against available board space.

Part Context

This part belongs to the 18QHTF21 series of crystal oscillators from Mercury Electronics. The series offers various frequencies and voltage options. The 'PD' suffix typically indicates a specific packaging or tape-and-reel configuration. This model represents a standard XO variant optimized for 1.8V operation, distinguishing it from higher voltage counterparts in the same family.

Replacement Considerations

Direct replacements must match the 1.8435 MHz frequency, 1.8V supply, LVCMOS output, and 4-SMD package. Verify pinout compatibility and electrical parameters such as jitter and phase noise. Consult manufacturer cross-reference lists for equivalent parts from other suppliers ensuring identical functional specifications.