EFJ-C4005E5B

Resonators Overview

The EFJ-C4005E5B is a surface-mount ceramic resonator manufactured by Panasonic Electronic Components. It operates at a nominal frequency of 40 MHz with a frequency tolerance of ±0.5%. The device incorporates built-in capacitors with a capacitance value of 8 pF, simplifying circuit design by eliminating the need for external load capacitors. It utilizes a compact 3-SMD package measuring 2.50mm x 2.00mm with a height of 1.25mm. This component is RoHS compliant and lead-free, suitable for timing applications in space-constrained electronic designs.

Resonators Feature Summary

• Integrated 8 pF internal capacitors reduce external component count
• Compact 3-SMD package facilitates dense board layouts
• High frequency stability with ±0.5% tolerance

Resonators Applications

• Clock generation for microprocessors
• Timing control in telecommunications equipment
• Frequency reference in mobile devices and IoT modules

Resonators Procurement Notes

Verify the specific suffix E5B corresponds to the required 8 pF internal capacitance and 40 MHz frequency during procurement. Confirm that the 3-SMD footprint dimensions align with the PCB land pattern. Ensure compliance with RoHS standards if required by the final product specifications. Cross-reference the manufacturer datasheet for precise mechanical tolerances before finalizing assembly.

Resonators Selection Notes

Select this component when a stable 40 MHz clock source is required with minimal external circuitry. The integrated capacitor feature makes it ideal for cost-sensitive and space-constrained designs compared to discrete crystal oscillator solutions. Consider the ±0.5% tolerance for applications requiring moderate frequency accuracy without the complexity of active oscillators.

Resonators Part Context

This part belongs to the EFJ-C series of ceramic resonators from Panasonic Electronic Components. These components are designed as alternatives to quartz crystals, offering easier soldering characteristics and lower cost while providing sufficient stability for many digital logic and microcontroller applications. The series supports various frequencies and package sizes.

Resonators Replacement Considerations

Direct substitutes include other Panasonic ceramic resonators with identical 40 MHz frequency, 8 pF internal capacitance, and compatible SMD footprints. Verify that alternative parts maintain the same ±0.5% tolerance and operating temperature range to ensure functional equivalence in existing designs.