18QHTF21-13.478-PD

Overview

The 18QHTF21-13.478-PD is a standard crystal oscillator manufactured by Mercury Electronics Ind. Co. Ltd. It operates at a frequency of 13.478 MHz with LVCMOS output logic and a supply voltage of 1.8V. The device features a standby (power down) function and is housed in a 4-SMD, No Lead package with dimensions of 2.0x1.6 mm. Key electrical parameters include a frequency stability of ±50ppm, an operating temperature range of -40°C to 85°C, and a maximum supply current of 24mA.

Feature Summary

• Supports low-voltage operation at 1.8V with LVCMOS output compatibility
• Includes standby mode for power reduction when not in use
• Compact surface-mount design suitable for space-constrained applications

Applications

• Portable electronic devices requiring low power consumption
• Communication equipment utilizing standard clock signals
• Embedded systems needing precise timing references

Procurement Notes

Verify the specific frequency tolerance and load capacitance requirements against your circuit design before procurement. Ensure the 1.8V supply voltage aligns with your system's power rails. Confirm that the 4-SMD no-lead package footprint matches your PCB layout constraints. Check for any specific handling instructions related to electrostatic discharge during assembly.

Selection Notes

Select this component when a compact, low-power oscillator with standard LVCMOS outputs is required. Consider the ±50ppm stability for general timing applications rather than high-precision needs. Evaluate the -40°C to 85°C temperature range against your environmental conditions. Compare the 24mA max current draw with other available options to optimize system power budget.

Part Context

This part belongs to the 18QHTF21 series from Mercury Electronics, which offers various frequencies within a small 2.0x1.6mm package. The series is designed for modern electronics demanding miniaturization and energy efficiency. Similar parts in the lineup differ primarily in operating frequency while maintaining consistent electrical characteristics and physical dimensions.

Replacement Considerations

Direct substitutes may include other 18QHTF21 series variants with different frequencies if the exact 13.478 MHz is not critical. Cross-reference with other manufacturers offering 2.0x1.6mm LVCMOS oscillators with similar voltage and stability specs. Verify pinout compatibility and thermal performance before substitution.