78F5R6J Equivalent & Substitute Parts

Part Overview

The Bourns 78F5R6J is a 5.6 µH unshielded drum core wirewound inductor rated for 185 mA with a maximum DC resistance of 400mOhm. This through-hole axial component operates across -55°C to 105°C and is designed for applications requiring fixed inductance in compact form factors. The 78F5R6J is classified as obsolete, making identification of suitable substitute components essential for ongoing production and maintenance applications.

Substiute Parts

78F5R6J

Bourns Inc.In Stock: 94378F5R6J Datasheet

Current PartRFQ

8230-38-RC

Bourns Inc.In Stock: 18458230-38-RC Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 78F5R6J is determined by the following critical parameters:

Core Substitution Criteria:

• Inductance value must match: 5.6 µH
• Core material must remain ferrite
• Shielding configuration must remain unshielded
• Mounting type must remain through-hole axial
• Operating temperature range must encompass or equal -55°C to 105°C

Acceptable Parameter Variations:

• Current rating may exceed the original specification (185 mA minimum required)
• DC resistance may vary within acceptable circuit performance limits
• Inductance tolerance may differ (±5% or ±10%)
• Physical dimensions may vary slightly while maintaining axial through-hole compatibility
• Q factor and self-resonant frequency may differ based on core design improvements

The Bourns 8230-38-RC meets all core substitution criteria while offering improved electrical characteristics and active product status.

Parameter Comparison

Engineering Selection Recommendations

The 8230-38-RC is the qualified substitute for the obsolete 78F5R6J based on the following factors:

Electrical Compatibility: Both components share identical 5.6 µH inductance values and ferrite core construction. The 8230-38-RC provides higher current capacity (260 mA versus 185 mA), ensuring adequate performance in circuits originally designed for the 78F5R6J.

Compliance Status: The 8230-38-RC holds active product status with ROHS3 compliance, whereas the 78F5R6J is obsolete and RoHS non-compliant. For new designs and regulated applications, the 8230-38-RC is the appropriate selection.

Physical Compatibility: Both components use through-hole axial mounting. The 8230-38-RC exhibits slightly larger dimensions (0.120" diameter x 0.300" length versus 0.110" x 0.280"), which must be verified against PCB layout constraints.

DC Resistance Consideration: The 8230-38-RC exhibits higher DC resistance (1.8Ohm Max versus 400mOhm Max). Circuit designs sensitive to inductor losses require evaluation of this parameter change.

Frequently Asked Questions (FAQ)

Q: Can the 8230-38-RC directly replace the 78F5R6J without circuit modification?

A: Direct replacement is possible for circuits where the higher DC resistance of the 8230-38-RC does not impact performance. Circuits with tight loss budgets or high-frequency applications require verification that the increased DCR remains acceptable.

Q: What is the impact of the inductance tolerance difference (±5% versus ±10%)?

A: The 78F5R6J provides tighter tolerance control. Applications requiring precise inductance values must account for the wider ±10% tolerance of the 8230-38-RC during circuit design.

Q: Are the physical dimension differences significant for PCB layout?

A: The 8230-38-RC is slightly larger (0.120" diameter x 0.300" length). Verify that the increased dimensions fit within existing PCB footprints and component spacing requirements.

Q: Why does the 8230-38-RC have higher current rating but higher DC resistance?

A: The 8230-38-RC represents a different design generation with improved core materials and winding techniques, resulting in higher saturation current capability. The higher DCR reflects different wire gauge and core geometry optimization.

Q: Is the 8230-38-RC suitable for RoHS-regulated applications?

A: Yes. The 8230-38-RC is ROHS3 compliant, making it appropriate for applications subject to RoHS directives. The obsolete 78F5R6J is not RoHS compliant.

Q: What is the significance of the higher self-resonant frequency in the 8230-38-RC?

A: The 8230-38-RC exhibits a self-resonant frequency of 68MHz compared to 40MHz for the 78F5R6J. This indicates improved high-frequency performance characteristics and broader usable frequency range.