LFXTAL078542

Overview

The LFXTAL078542 is a quartz crystal resonator manufactured by IQD Frequency Products. It operates at a fundamental frequency of 4 MHz with a load capacitance of 20 pF and a frequency tolerance of ±30 ppm. The component features an equivalent series resistance (ESR) of 130 Ohms and supports a maximum drive level of 1 mW. It utilizes the HC49/4HSMX package style, designed for surface mount or through-hole applications depending on specific board layout requirements. The device is rated for operation within a temperature range of -40°C to +85°C.

Feature Summary

• Provides stable 4 MHz timing reference for digital circuits
• HC49/4HSMX form factor ensures compatibility with standard mounting processes
• Operates reliably across industrial temperature ranges

Applications

• Microcontroller clock sources
• Communication interface timing
• General-purpose digital logic circuits

Procurement Notes

Verify the exact package variant required, as HC49/4HSMX designations can imply different lead configurations or mounting styles. Confirm that the 1 mW drive level specification aligns with the oscillator circuit design to prevent over-driving the crystal. Ensure the ±30 ppm tolerance meets the system timing requirements before finalizing the procurement order.

Selection Notes

Select this component when a 4 MHz frequency is required with moderate stability. The HC49/4HSMX package offers a balance between size and mechanical robustness. Consider the 130 Ohm ESR value when designing the load capacitors and oscillator feedback network to ensure reliable startup and sustained oscillation.

Part Context

This part belongs to the general quartz crystal product line from IQD Frequency Products. It serves as a basic timing element for non-critical clock applications. Unlike TCXOs or OCXOs, it does not include internal temperature compensation or heating elements, relying solely on the quartz resonator's inherent properties for frequency stability.

Replacement Considerations

Cross-reference with other manufacturers offering HC49/4HSMX packaged crystals at 4 MHz. Verify that substitute parts match the 20 pF load capacitance and 130 Ohm ESR specifications to maintain circuit performance without modification.