18QHTF21-64.810-PD

Overview

The 18QHTF21-64.810-PD is a standard crystal oscillator manufactured by Mercury Electronics Ind. Co., Ltd. It operates at a nominal frequency of 64.81 MHz with a stability of 50 ppm. The device utilizes an LVCMOS output logic and requires a supply voltage of 1.8V. Maximum current consumption is specified as 26 mA. The component features a 4-SMD, No Lead package with dimensions of 2.0 x 1.6 mm. It includes a standby (power down) function for energy management.

Feature Summary

• Supports low-voltage operation at 1.8V with LVCMOS output compatibility
• Integrates a standby mode to reduce power consumption during idle periods
• Utilizes a compact surface-mount package design for space-constrained applications

Applications

• General-purpose digital timing circuits requiring precise clock signals
• Embedded systems utilizing low-voltage microcontrollers
• Portable electronic devices where power efficiency is critical

Procurement Notes

Verify the specific frequency tolerance and load capacitance requirements against the system design specifications before procurement. Confirm that the 1.8V supply rail can maintain stable voltage under peak current loads of 26 mA. Ensure the PCB layout accommodates the 4-SMD no-lead footprint dimensions accurately to guarantee reliable soldering and electrical performance.

Selection Notes

Select this component when a fixed frequency of 64.81 MHz is required with moderate stability. Consider the 1.8V operating voltage constraint for compatibility with modern low-power logic families. Evaluate the need for standby functionality if power management is a priority. Compare package size constraints against available board real estate to ensure mechanical fit within the assembly.

Part Context

This part belongs to the 18QHTF21 series from Mercury Electronics, which offers various frequencies in a small form factor. The series typically targets consumer electronics and portable devices. The 'PD' suffix indicates the inclusion of a power-down feature. This model provides a balance between size, power consumption, and timing accuracy for standard digital applications.

Replacement Considerations

Direct substitutes must match the 64.81 MHz frequency, 1.8V supply, LVCMOS output, and 4-SMD no-lead package. Verify pinout compatibility and thermal characteristics. Cross-reference with other manufacturers offering similar small-footprint oscillators with comparable stability ratings.