18QHTF21-64.500-PD

Overview

The 18QHTF21-64.500-PD is a 64.5 MHz crystal oscillator (XO) manufactured by Mercury Electronics Ind. Co. Ltd. It operates at a supply voltage of 1.8V and utilizes LVCMOS output logic. The device features a Standby (Power Down) function for energy management. It is housed in a compact 4-SMD, No Lead package with dimensions of 2.0x1.6 mm.

Feature Summary

• Supports Low Voltage CMOS (LVCMOS) output logic levels
• Includes Standby mode capability for power down control
• Utilizes a surface-mount 4-SMD no-lead package design

Applications

• General clock signal generation in electronic circuits
• Timing reference for digital systems requiring low voltage operation
• Portable devices utilizing space-constrained surface mount components

Procurement Notes

Verify the specific frequency tolerance and load capacitance requirements against the target circuit design before procurement. Confirm that the 1.8V supply voltage aligns with the system's power rails. Ensure the 4-SMD footprint matches the PCB layout specifications to guarantee proper mechanical and electrical connection during assembly.

Selection Notes

Select this component when a precise 64.5 MHz timing source is required within a low-voltage 1.8V environment. The choice is driven by the need for a small form factor suitable for dense PCB layouts. Consider the LVCMOS interface compatibility with downstream logic gates or microcontrollers to ensure signal integrity without additional level shifting.

Part Context

This part belongs to the 18QHTF21 series of standard crystal oscillators from Mercury Electronics. The series offers various frequencies optimized for consumer and industrial electronics. The 'PD' suffix indicates the inclusion of a power-down pin functionality, distinguishing it from continuous-operation variants within the same physical package family.

Replacement Considerations

Direct substitutes include other 64.5 MHz XO models from Mercury Electronics with identical 1.8V LVCMOS specifications and 2.0x1.6mm footprints. Cross-referencing with other manufacturers requires verifying pinout compatibility and electrical parameter equivalence to ensure seamless integration.