18QHTF21-74.990-PD

Overview

The 18QHTF21-74.990-PD is a standard crystal oscillator manufactured by Mercury Electronic Ind., Co., Ltd. It operates at a fixed frequency of 74.99 MHz with an LVCMOS output logic level. The device requires a supply voltage of 1.8V and supports a standby or power-down mode for energy management. It is housed in a compact 4-SMD, No Lead package with dimensions of 2.0mm x 1.6mm. The component exhibits a frequency stability of ±50ppm and is designed for operation within standard industrial temperature ranges.

Feature Summary

• Supports low-voltage operation at 1.8V with LVCMOS output compatibility
• Includes standby functionality to reduce power consumption during idle states
• Utilizes a small-footprint surface-mount package for space-constrained designs

Applications

• General-purpose clock signal generation in embedded systems
• Timing reference for digital communication interfaces
• Clock source for microcontrollers and processors requiring 1.8V logic levels

Procurement Notes

Verify the specific frequency tolerance and load capacitance requirements against the target circuit design before procurement. Ensure that the 1.8V supply rail is stable and meets the current specifications outlined in the official datasheet. Confirm that the PCB layout accommodates the 2.0x1.6mm footprint and that reflow soldering profiles comply with Mercury Electronics manufacturing guidelines to maintain reliability.

Selection Notes

Select this component when a precise 74.99 MHz timing source is required with minimal board space. The choice is appropriate for applications demanding low power consumption due to the standby feature. Consider the ±50ppm stability limit when evaluating system timing accuracy requirements. Ensure compatibility with 1.8V logic families and verify that the operating temperature range aligns with the environmental conditions of the final product.

Part Context

This part belongs to the 18QHTF21 series of surface-mount crystal oscillators from Mercury Electronic Ind., Co., Ltd. The series offers various frequency options within a standardized 2.0x1.6mm package. These oscillators are designed to provide reliable clock signals for modern electronic devices, balancing performance with compact physical dimensions and low power consumption characteristics typical of contemporary SMD components.

Replacement Considerations

Direct substitutes must match the 74.99 MHz frequency, 1.8V supply, LVCMOS output, and 2.0x1.6mm package. Verify pinout compatibility and electrical parameters such as stability and drive strength. Cross-reference with Mercury Electronics' official replacement lists or equivalent industry parts ensuring identical form, fit, and function.