18QHTF21-12.5445-OE

Overview

The 18QHTF21-12.5445-OE is a standard crystal oscillator (XO) manufactured by Mercury Electronics Ind. Co. Ltd. It operates at a nominal frequency of 12.5445 MHz with a frequency stability of ±50ppm. The device utilizes LVCMOS output logic and requires a 1.8V supply voltage, drawing a maximum supply current of 22mA. It features an enable/disable control function and is housed in a compact 4-SMD, No Lead package. The component supports an extended operating temperature range from -40°C to 85°C, ensuring reliable performance in various electronic applications requiring precise timing signals.

Feature Summary

• LVCMOS output logic for digital interface compatibility
• Integrated enable and disable control functionality
• Compact 4-SMD no-lead surface mount package design

Applications

• Digital signal processing systems
• Communication equipment clocking
• Embedded system timing references

Procurement Notes

Verify the specific frequency tolerance and load capacitance requirements against the target circuit design before procurement. Confirm that the 1.8V supply rail can maintain stable voltage under peak current conditions of 22mA. Ensure the PCB layout accommodates the 4-SMD no-lead package dimensions and thermal characteristics suitable for the -40°C to 85°C operating range. Cross-reference the manufacturer's latest datasheet for any updates on pin configuration or recommended soldering profiles.

Selection Notes

Select this oscillator when a low-voltage 1.8V operation is required alongside standard LVCMOS outputs. The ±50ppm stability suits general-purpose timing needs rather than high-precision RF applications. Consider the enable/disable feature if power management during idle states is a priority. The wide temperature range makes it suitable for industrial environments. Evaluate space constraints as the 4-SMD package offers a small footprint compared to larger through-hole alternatives.

Part Context

This part belongs to the 18QHTF21 series of surface-mount oscillators from Mercury Electronics. The series typically includes various frequencies and voltage options, all sharing similar package and electrical characteristics. The '-OE' suffix may indicate specific ordering or packaging variations defined by the manufacturer. This model represents a standard XO variant designed for cost-effective integration into consumer and industrial electronics where moderate stability and low power consumption are balanced requirements.

Replacement Considerations

Direct replacements must match the 12.5445 MHz frequency, 1.8V supply, LVCMOS output, and 4-SMD package. Verify equivalent stability ratings and operating temperature ranges. Check for compatible enable/disable pin configurations. Consult manufacturer cross-reference lists for verified substitutes.