LFXTAL036900B

Overview

The LFXTAL036900B is a quartz crystal unit manufactured by IQD Frequency Products, designed for precision timing applications. It operates at a nominal frequency of 4 MHz with a tight initial tolerance of ±10 ppm and a long-term stability of ±30 ppm. The component utilizes a standard HC-49/4H package, featuring a load capacitance of 30 pF to ensure accurate oscillation in series resonant circuits. Electrical characteristics include a maximum equivalent series resistance (ESR) of 50 ohms and a drive level limit of 100 µW. The device supports surface mount or through-hole integration depending on the specific variant configuration, operating within a temperature range of -20°C to +70°C.

Feature Summary

• Provides high-frequency stability suitable for precise clock generation
• Utilizes robust HC-49/4H packaging for reliable mechanical mounting
• Engineered for low power consumption with controlled drive levels

Applications

• Microcontroller clock sources
• Communication interface timing
• Digital signal processing systems

Procurement Notes

Verify the exact package style and termination type required for your PCB layout, as HC-49 variants may differ between through-hole and surface-mount configurations. Confirm that the 30 pF load capacitance matches your oscillator circuit design to maintain the specified ±10 ppm accuracy. Ensure the drive level does not exceed 100 µW to prevent frequency shifts or crystal damage during operation.

Selection Notes

Select this component when a stable 4 MHz reference is required with strict tolerance limits. The HC-49/4H form factor offers a balance between size and performance for general-purpose electronics. Consider the ±30 ppm stability over temperature if environmental variations are present. This part is suitable for designs where cost-effective precision timing is prioritized over ultra-high stability requirements found in TCXO alternatives.

Part Context

This crystal belongs to the HC49/4HSMX series from IQD Frequency Products, a line known for standardized dimensions and reliable performance in consumer and industrial electronics. The LFXTAL prefix indicates a specific frequency and parameter set within the manufacturer's catalog, ensuring compatibility with common oscillator ICs and microcontroller peripherals requiring a 4 MHz input.

Replacement Considerations

Direct substitutes must match the 4 MHz frequency, 30 pF load capacitance, and HC-49/4H package. Verify that alternative parts meet the same ±10 ppm tolerance and ≤50 ohm ESR specifications. Check that the replacement supports the required operating temperature range of -20°C to +70°C.