18QHTF21-6.1679-PD

Overview

The 18QHTF21-6.1679-PD is a standard crystal oscillator (XO) manufactured by Mercury Electronics Ind. Co. Ltd. It operates at a fixed frequency of 6.1679 MHz and utilizes LVCMOS output logic levels. The device is designed for a supply voltage of 1.8V and features a power-down function via the 'PD' suffix, allowing for standby mode control. It is housed in a compact 4-SMD, No Lead package with dimensions of 2.0mm x 1.6mm. This component is engineered for timing applications requiring precise clock signals in low-voltage digital systems.

Feature Summary

• Integrates LVCMOS output interface for direct compatibility with standard digital logic circuits
• Includes dedicated power-down functionality to reduce current consumption during inactive periods
• Utilizes MEMS or quartz technology for stable frequency generation within a miniature surface-mount footprint

Applications

• Portable electronic devices requiring low-power clock sources
• Battery-operated consumer electronics
• Embedded systems with strict size constraints
• Digital signal processing circuits needing precise timing references

Procurement Notes

Verify the specific operating temperature range and load capacitance requirements against your system design before procurement. Confirm that the 1.8V supply rail is stable and within tolerance to ensure reliable oscillation. Check for RoHS compliance status if environmental regulations apply to your manufacturing process. Ensure the PCB layout supports the 4-SMD no-lead package geometry for proper soldering and thermal performance.

Selection Notes

Select this model when a 6.1679 MHz frequency is strictly required rather than a standard integer value. The 1.8V supply voltage makes it suitable for modern low-power logic families. The power-down feature is critical for applications where energy efficiency during idle states is a priority. Compare the 2.0x1.6mm package size against available board space to ensure mechanical fitment alongside other components.

Part Context

This part belongs to the 18QHTF21 series from Mercury Electronics, which focuses on small-form-factor oscillators. The series typically offers various frequencies and supply voltages. The 'PD' designation specifically indicates the inclusion of a power-down pin, distinguishing it from continuous-operation variants like the 'OE' (Enable/Disable) version. This series targets cost-sensitive and space-constrained market segments.

Replacement Considerations

Direct substitutes may include other 6.1679 MHz LVCMOS oscillators in 2.0x1.6mm packages with power-down capabilities. Verify equivalent supply voltage, output drive strength, and phase noise specifications. Cross-reference with Mercury's own OE variant if enable/disable logic is preferred over power-down. Ensure any replacement maintains the same package outline dimensions for board compatibility.