18QHTF21-8.190-PD

Overview

The 18QHTF21-8.190-PD is a standard crystal oscillator (XO) manufactured by Mercury Electronics Ind. Co. Ltd. It operates at a fixed frequency of 8.19 MHz and utilizes LVCMOS output logic. The device is designed for low-voltage applications, requiring a supply voltage of 1.8V. It features a power-down function to reduce consumption when not in use. The component is housed in a compact 4-SMD, No Lead package with dimensions of 2.0mm x 1.6mm.

Feature Summary

• LVCMOS output logic for digital interface compatibility
• Integrated standby mode for power management
• Compact surface-mount footprint

Applications

• General clock signal generation
• Digital circuit timing references
• Embedded system clock sources

Procurement Notes

Verify the specific frequency tolerance and load capacitance requirements against the target application design before procurement. Confirm that the 1.8V supply voltage aligns with the system's power rails. Ensure the PCB layout accommodates the 4-SMD no-lead package dimensions accurately to maintain signal integrity and mechanical stability during assembly processes.

Selection Notes

Select this component when a precise 8.19 MHz reference is required in space-constrained designs. The choice is driven by the need for low-voltage operation and integrated power-down capabilities. Consider the LVCMOS output swing compatibility with downstream logic families. Evaluate thermal performance within the small form factor constraints typical of modern portable electronics.

Part Context

This part belongs to the 18QHTF21 series from Mercury Electronics, which focuses on miniature oscillators. The series typically offers various frequencies within a standardized 2.0x1.6mm package. This specific model represents the 8.19 MHz variant, maintaining consistent electrical characteristics across the family while differing only in frequency specification.

Replacement Considerations

Direct substitutes must match the 8.19 MHz frequency, 1.8V supply, LVCMOS output, and 4-SMD no-lead package. Verify pinout compatibility and thermal specifications. Cross-reference with other manufacturers offering similar footprint oscillators if Mercury Electronics availability is limited.