18QHTF21-70.455-PD

Overview

The 18QHTF21-70.455-PD is a standard crystal oscillator manufactured by Mercury Electronics Ind. Co. Ltd. It operates at a frequency of 70.455 MHz with an LVCMOS output logic level. The device requires a supply voltage of 1.8V and features a standby or power-down function for energy management. It is housed in a compact 4-SMD, No Lead package with dimensions of 2.0mm x 1.6mm. This component is designed for applications requiring precise clock signals within a small form factor.

Feature Summary

• Supports standby mode for power reduction
• Compact surface-mount package design
• LVCMOS output compatibility

Applications

• General purpose clock generation
• Embedded systems timing
• Consumer electronics circuits

Procurement Notes

Verify the specific frequency tolerance and load capacitance requirements against your circuit design before procurement. Confirm that the 1.8V supply voltage aligns with your system's power rails. Ensure the 4-SMD no-lead package footprint matches your PCB layout constraints. Check for any specific reflow soldering profile recommendations provided by the manufacturer to ensure reliable assembly and long-term performance stability.

Selection Notes

Select this model when a 70.455 MHz clock signal is required with low power consumption capabilities. The 1.8V operating voltage makes it suitable for modern low-voltage digital logic families. Consider the physical size constraints as the 2.0x1.6mm package is quite small. Verify that the LVCMOS output swing is compatible with the input thresholds of the receiving components in your design architecture.

Part Context

This part belongs to the QHTF series of crystal oscillators from Mercury Electronics. The series typically offers various frequencies and supply voltages. The '18' prefix indicates the 1.8V supply variant. These oscillators are known for their reliability in Taiwan-manufactured frequency control products, serving as stable timekeeping sources for digital circuits.

Replacement Considerations

Direct substitutes must match the 70.455 MHz frequency, 1.8V supply, LVCMOS output, and 4-SMD no-lead package. Other manufacturers may offer equivalent parts, but pinout and electrical characteristics must be verified. Ensure thermal and mechanical specifications are compatible with the existing design.