18QHTF21-74.520-PD

Overview

The 18QHTF21-74.520-PD is a standard crystal oscillator (XO) manufactured by Mercury Electronics Ind. Co. Ltd. It operates at a fixed frequency of 74.52 MHz with an LVCMOS output logic level. The device requires a supply voltage of 1.8V and features a standby or power-down function for energy management. It is housed in a compact 4-SMD, no lead package with dimensions of 2.0 x 1.6 mm. The component supports spread spectrum functionality to reduce electromagnetic interference.

Feature Summary

• LVCMOS output interface for digital compatibility
• Integrated standby mode for power reduction
• Spread spectrum capability for EMI mitigation
• Compact surface-mount packaging

Applications

• High-speed data communication interfaces
• Network equipment clock generation
• Consumer electronics timing references
• Industrial control system synchronization

Procurement Notes

Verify the specific operating temperature range and load capacitance requirements against the target application design before procurement. Confirm that the 1.8V supply voltage aligns with the system power rails. Ensure the PCB footprint matches the 2.0x1.6mm SMD package dimensions to prevent assembly issues. Check for any specific reflow soldering profile recommendations provided by the manufacturer to maintain component integrity during manufacturing.

Selection Notes

Select this model when a precise 74.52 MHz reference is required with low power consumption constraints. The LVCMOS output is suitable for direct interfacing with standard digital logic families. Consider the spread spectrum feature if electromagnetic compliance is a critical design factor. The small form factor makes it ideal for space-constrained portable devices or dense circuit boards where minimal footprint is essential for layout optimization.

Part Context

This part belongs to the Mercury Electronics 18QHTF21 series of surface-mount crystal oscillators. The series offers various frequencies and voltage options within a standardized 2.0x1.6mm package. Mercury Electronics specializes in quartz frequency control products, including crystals, TCXOs, and OCXOs, leveraging decades of manufacturing expertise in Taiwan to provide reliable timing solutions for global electronic markets.

Replacement Considerations

Direct substitutes include other 74.52 MHz LVCMOS oscillators in 2.0x1.6mm packages from compatible manufacturers. Verify pinout compatibility and electrical specifications such as current consumption and startup time. Cross-reference with Mercury's own variants like the 18QHTF21-51.200-PD if frequency adjustments are permissible. Ensure thermal and mechanical tolerances match the original design constraints.