78F471J Equivalent & Substitute Parts

Part Overview

The Bourns 78F471J is a 470 µH unshielded drum core wirewound inductor rated for 53 mA maximum current with 11.6Ohm DC resistance. This through-hole axial component operates across -55°C to 105°C and is designed for applications requiring fixed inductance filtering and energy storage. The 78F471J is currently obsolete, making identification of compatible substitute parts essential for ongoing production support and design continuity.

Substiute Parts

78F471J

Bourns Inc.In Stock: 123278F471J Datasheet

Current PartRFQ

78F471J-RC

Bourns Inc.In Stock: 364778F471J-RC Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

The 78F471J-RC qualifies as a direct substitute based on the following matching parameters:

• Inductance Value: Both parts are 470 µH with ±5% tolerance
• Core Type: Both use ferrite drum core construction
• Shielding Configuration: Both are unshielded
• Mounting & Package: Both are through-hole axial components
• Operating Temperature Range: Both operate -55°C to 105°C
• Test Frequency: Both measured at 790 kHz
• Physical Dimensions: Identical 0.110" Dia x 0.280" L (2.79mm x 7.11mm)
• Series Classification: Both belong to the 78F series

The 78F471J-RC provides enhanced current handling (90 mA vs. 53 mA) and maintains the same inductance specification, making it suitable for applications where the original part is no longer available.

Parameter Comparison

Engineering Selection Recommendations

The 78F471J-RC is the direct active substitute for the obsolete 78F471J. Selection of the 78F471J-RC is supported by:

• Product Availability: The 78F471J-RC maintains active production status with 3630 units in stock, compared to the obsolete 78F471J with limited remaining inventory
• Regulatory Compliance: The 78F471J-RC achieves ROHS3 compliance, whereas the original part is RoHS non-compliant, aligning with current environmental regulations
• Electrical Equivalence: Identical inductance, tolerance, core material, and frequency characteristics ensure functional compatibility in existing circuit designs
• Current Margin: The increased current rating (90 mA vs. 53 mA) provides additional design margin without affecting inductance performance
• Physical Compatibility: Identical axial package dimensions and through-hole mounting ensure direct PCB placement compatibility

Frequently Asked Questions (FAQ)

Q: Can the 78F471J-RC be used as a direct replacement for the 78F471J?

A: Yes. Both parts share identical inductance (470 µH), tolerance (±5%), core material (ferrite), shielding (unshielded), mounting type (through-hole axial), operating temperature range (-55°C to 105°C), and physical dimensions (0.110" Dia x 0.280" L). The 78F471J-RC is the active production equivalent.

Q: What are the differences between these parts?

A: The 78F471J-RC provides higher current rating (90 mA vs. 53 mA), slightly higher DC resistance (14Ohm vs. 11.6Ohm), marginally higher self-resonant frequency (2.55MHz vs. 2.5MHz), and achieves ROHS3 compliance versus RoHS non-compliance of the original.

Q: Are there any circuit design considerations when substituting?

A: The increased DC resistance (2.4Ohm difference) may result in slightly higher power dissipation in high-current applications. The higher current rating provides additional operational margin. Both parts maintain identical Q factor at 790 kHz, ensuring equivalent filtering performance.

Q: Is the axial package identical between both parts?

A: Yes. Both parts use identical through-hole axial packaging with 0.110" diameter and 0.280" length (2.79mm x 7.11mm), ensuring direct PCB compatibility without layout modifications.

Q: What is the significance of the ROHS3 compliance difference?

A: The 78F471J-RC meets current ROHS3 environmental standards, whereas the 78F471J does not. For new designs and production environments subject to RoHS regulations, the 78F471J-RC is the compliant choice.