18QHTF21-85.500-PD

Overview

The 18QHTF21-85.500-PD is a quartz crystal oscillator manufactured by Mercury Electronics Ind. Co., Ltd. It operates at a standard frequency of 85.5 MHz and utilizes LVCMOS output logic. The device is designed for a supply voltage of 1.8V and features a Standby (Power Down) control function to manage power consumption. It is housed in a compact 4-SMD, No Lead package with dimensions of 2.0 x 1.6 mm. This component is suitable for applications requiring precise timing signals within space-constrained electronic designs.

Feature Summary

• Supports Low Voltage CMOS (LVCMOS) output logic for digital interface compatibility
• Includes Standby (Power Down) functionality for active power management
• Utilizes a surface-mount 4-SMD No Lead package for automated assembly

Applications

• General purpose clock signal generation in consumer electronics
• Timing reference sources for embedded systems and microcontrollers
• Data communication interfaces requiring stable frequency standards

Procurement Notes

Verify the specific frequency tolerance and stability specifications against the official datasheet prior to integration. 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 design requirements for proper soldering and mechanical retention.

Selection Notes

Select this component when a low-profile 2.0x1.6mm form factor is required alongside LVCMOS outputs. Consider the 1.8V operating voltage constraint relative to other available supply options. Evaluate the need for standby control capabilities versus always-on operation based on system power efficiency goals and thermal constraints.

Part Context

This part belongs to the QHTF series of surface-mount oscillators from Mercury Electronics. The series typically offers various standard frequencies and packaging options. The 'PD' suffix indicates the inclusion of a power-down pin or control feature, distinguishing it from standard continuous-operation variants within the same physical footprint family.

Replacement Considerations

Direct substitutes must match the 85.5 MHz frequency, 1.8V supply, LVCMOS output, and 4-SMD No Lead package. Verify equivalent electrical parameters such as phase noise and jitter if critical to the application performance.