LFXTAL078435B

Overview

The LFXTAL078435B is a quartz crystal manufactured by IQD Frequency Products, designed for through-hole mounting in the HC-49/US package. It operates at a fundamental frequency of 20 MHz with a load capacitance of 20 pF. The component exhibits a frequency tolerance of ±30 ppm and stability of ±50 ppm. Key electrical parameters include an equivalent series resistance (ESR) of 40 Ohms maximum and a shunt capacitance of 7 pF maximum. The drive level is limited to 500 µW. The unit supports an operating temperature range from -20°C to +70°C and features hermetically sealed glass-to-metal seals.

Feature Summary

• Hermetically sealed construction using resistance welding and glass-to-metal seals within an inert atmosphere.
• Fundamental mode operation ensuring stable oscillation at 20 MHz.
• Industry-standard HC-49/US radial leaded package for reliable through-hole integration.

Applications

• General-purpose timing circuits requiring 20 MHz reference signals
• Microcontroller clock sources in consumer electronics
• Industrial control systems operating within standard temperature ranges

Procurement Notes

Verify the specific suffix against official IQD documentation to confirm exact packaging and environmental compliance status. Ensure the selected variant matches the required HC-49/US footprint and lead configuration. Cross-reference the datasheet for precise ESR and load capacitance values relevant to the target oscillator circuit design before finalizing procurement orders.

Selection Notes

Select this component when a 20 MHz fundamental frequency with 20 pF load capacitance is required. The HC-49/US package suits applications needing robust mechanical stability and through-hole assembly. Consider the ±30 ppm tolerance and -20°C to +70°C operating range to ensure compatibility with the system's timing accuracy and thermal environment requirements.

Part Context

This part belongs to the IQD Frequency Products quartz crystal portfolio, utilizing the widely adopted HC-49/US form factor. It represents a standard solution for discrete timing applications where hermetic sealing and fundamental mode stability are prioritized over surface-mount convenience or higher frequency ranges.

Replacement Considerations

No public confirmed substitute part numbers are available in the provided documentation.