18QHTF21-70.2875-PD

Overview

The 18QHTF21-70.2875-PD is a standard crystal oscillator manufactured by Mercury Electronics Ind. Co. Ltd. It operates at a nominal frequency of 70.2875 MHz and utilizes LVCMOS output logic. The device is designed for a supply voltage of 1.8V and features a Standby (Power Down) control function to manage power consumption. It is housed in a compact 4-SMD, No Lead package with dimensions of 2.0 x 1.6 mm. This component serves as a precise clock source for digital circuits requiring low-profile surface-mount integration.

Feature Summary

• Supports LVCMOS output logic for direct interface with digital loads
• Includes Standby (Power Down) functionality for active power management
• Utilizes a compact 4-SMD No Lead package for space-constrained designs

Applications

• Clock generation for high-speed digital signal processing systems
• Timing reference for communication interface modules
• Power management circuits requiring precise frequency standards

Procurement Notes

Verify the specific frequency tolerance and load capacitance requirements against the target circuit design before procurement. Confirm that the 1.8V supply voltage aligns with the system's power rails. Ensure the PCB footprint matches the 4-SMD No Lead package dimensions to prevent assembly errors. Cross-reference the datasheet for operating temperature ranges to guarantee reliability under intended environmental conditions.

Selection Notes

Select this model when a low-profile surface-mount oscillator is required for 70.2875 MHz applications. The 1.8V supply voltage makes it suitable for modern low-power digital logic families. The inclusion of a standby pin allows for dynamic power reduction in battery-operated or energy-efficient devices. Consider the 2.0x1.6mm footprint constraints during layout planning to ensure adequate spacing and thermal performance.

Part Context

This part belongs to the 18QHTF21 series from Mercury Electronics, which specializes in quartz frequency control products. The series offers various frequencies within a standardized small outline package. Mercury Electronics has been a pioneer in the crystal industry since 1973, providing components such as TCXOs, VCXOs, and OCXOs. This specific model represents a standard XO variant optimized for cost-effective and space-sensitive electronic assemblies.

Replacement Considerations

Direct substitutes must match the 70.2875 MHz frequency, 1.8V supply, LVCMOS output, and 4-SMD No Lead package. Verify that alternative manufacturers offer identical pinout configurations and mechanical dimensions. Ensure comparable frequency stability and phase noise specifications if used in sensitive timing applications.