18QHTF21-85.700-PD

Overview

The 18QHTF21-85.700-PD is a standard crystal oscillator manufactured by Mercury Electronics Ind. Co., Ltd. It operates at a fixed frequency of 85.7 MHz and utilizes LVCMOS output logic. The device is designed for low-voltage applications, requiring a supply voltage of 1.8V. It features a standby mode with power-down capability to conserve energy when not in active use. The component is housed in a compact 4-SMD, no-lead package with dimensions of 2.0 x 1.6 mm, suitable for space-constrained surface-mount designs.

Feature Summary

• Supports LVCMOS output logic for digital interface compatibility
• Includes standby functionality with power-down control
• Utilizes a small form factor 4-SMD no-lead package

Applications

• General-purpose clock signal generation in embedded systems
• Timing reference for low-voltage digital circuits
• Portable electronic devices requiring compact oscillators

Procurement Notes

Verify the specific frequency tolerance and load capacitance requirements against your circuit design before procurement. Ensure the 1.8V supply rail is stable and within the specified operating range. Confirm that the PCB footprint matches the 2.0x1.6mm SMD package dimensions. Check for any specific reflow soldering profile recommendations provided in the official datasheet to ensure reliable assembly.

Selection Notes

Select this component when a precise 85.7 MHz clock source is required for LVCMOS-compatible logic families. The choice is driven by the need for a low-profile, surface-mount oscillator with power management capabilities. Consider the 1.8V operating voltage constraint and the physical size limitations of the target application board when evaluating alternative packages or frequencies.

Part Context

This part belongs to the 18QHTF21 series from Mercury Electronics, which offers various standard frequencies in a unified 2.0x1.6mm SMD package. The series is characterized by its low-voltage operation and integrated power-down feature. The 'PD' suffix typically indicates the power-down pin configuration or standby capability, distinguishing it from non-stby variants within the same family.

Replacement Considerations

Direct replacements must match the 85.7 MHz frequency, 1.8V supply, LVCMOS output, and 4-SMD 2.0x1.6mm package. Verify pinout compatibility and electrical characteristics such as phase noise and jitter if critical. Cross-reference with other manufacturers offering similar low-profile XO components with standby functions.