18QHTF21-7.998-PD

Overview

The 18QHTF21-7.998-PD is a standard crystal oscillator manufactured by Mercury Electronics Ind. Co. Ltd. It operates at a fixed frequency of 7.998 MHz and utilizes LVCMOS output logic. The device is designed for low-power applications, featuring a supply voltage of 1.8V and a standby power-down mode to reduce energy consumption during idle periods. It is housed in a compact 4-SMD, No Lead package with dimensions of 2.0mm x 1.6mm. The component supports an operating temperature range typical for commercial grade devices, ensuring reliable performance in various electronic systems requiring precise timing signals.

Feature Summary

• LVCMOS output logic for digital interface compatibility
• Integrated standby power-down mode for energy efficiency
• Compact 4-SMD no-lead surface mount package design

Applications

• Battery-powered portable electronic devices
• Consumer electronics requiring precise clock signals
• Embedded systems with limited power budgets

Procurement Notes

Verify the specific frequency tolerance and stability specifications against the official datasheet before procurement, as these parameters are critical for timing-sensitive applications. Ensure that the 1.8V supply voltage aligns with the target system's power rails. Confirm the package orientation and pinout configuration matches the PCB footprint design to prevent assembly errors. Request the latest manufacturing documentation to ensure compliance with current environmental standards and RoHS directives applicable to the region of deployment.

Selection Notes

Select this component when a low-voltage, low-power oscillator is required for space-constrained designs. The 1.8V operation makes it suitable for modern battery-operated devices where power conservation is paramount. The LVCMOS output ensures direct interfacing with standard digital logic families without additional level shifting. Consider the small form factor for high-density board layouts. Evaluate the need for a power-down feature if the application involves intermittent usage patterns to extend battery life.

Part Context

This part belongs to the 18QHTF21 series of surface-mount crystal oscillators from Mercury Electronics. The series offers various frequency options within a standardized 2.0x1.6mm package. The 'PD' suffix indicates the inclusion of a power-down control function. Mercury Electronics specializes in frequency control products, including quartz crystals and oscillators, providing solutions for timing applications across consumer, industrial, and communication sectors.

Replacement Considerations

Direct replacements must match the 7.998 MHz frequency, 1.8V supply, LVCMOS output, and 4-SMD package dimensions. Verify equivalent electrical characteristics such as load regulation and phase noise if specified in the original design. Cross-reference with other manufacturers offering similar low-profile oscillators with integrated power management features.