18QHTF21-74.280-PD

Overview

The 18QHTF21-74.280-PD is a standard crystal oscillator (XO) manufactured by Mercury Electronics Ind. Co., Ltd. It operates at a fixed frequency of 74.28 MHz and utilizes LVCMOS output logic. The device is designed for a supply voltage of 1.8V and features a power-down function accessible via a standby control pin. It is housed in a compact 4-SMD, no-lead package with dimensions of 2.0 x 1.6 mm. This component is engineered for applications requiring precise timing signals within low-voltage digital systems.

Feature Summary

• Generates a stable 74.28 MHz clock signal using LVCMOS logic levels
• Operates on a single 1.8V power supply rail
• Includes a dedicated standby pin to enable power-down mode
• Utilizes a small form-factor 4-SMD no-lead surface mount package

Applications

• Digital signal processing circuits requiring precise clock synchronization
• Communication interfaces utilizing LVCMOS signaling standards
• Embedded systems powered by 1.8V logic families
• Portable electronic devices constrained by space and power consumption

Procurement Notes

Verify the specific frequency tolerance and load capacitance requirements against your circuit design before ordering. Confirm that the 1.8V supply voltage aligns with your system's power architecture. Ensure the PCB footprint matches the 2.0 x 1.6 mm SMD package dimensions. Check for any specific handling instructions related to the no-lead package type during assembly.

Selection Notes

Select this oscillator when a fixed 74.28 MHz frequency is required with LVCMOS outputs. Consider the 1.8V operating voltage as a primary constraint for compatibility. Evaluate the need for power management features, specifically the standby capability. Assess the physical space constraints to ensure the 4-SMD package fits the design layout. Compare performance metrics against alternative oscillators if tighter tolerances are needed.

Part Context

This part belongs to the 18QHTF21 series of crystal oscillators from Mercury Electronics. The series offers various frequencies and voltage options within similar small packages. The 'PD' suffix indicates the inclusion of a power-down feature. These components are part of Mercury's broader portfolio of frequency control products established since 1973.

Replacement Considerations

Direct substitutes must match the 74.28 MHz frequency, 1.8V supply, LVCMOS output, and 4-SMD 2.0x1.6mm package. Verify pinout compatibility and electrical characteristics such as jitter and phase noise. Consult manufacturer cross-reference lists for approved equivalents.