Bourns 78F6R8J Equivalent & Substitute Parts

Part Overview

The Bourns 78F6R8J is a 6.8 µH unshielded drum core wirewound inductor rated for 175 mA with a maximum DC resistance of 450mOhm. This through-hole axial component operates across a temperature range of -55°C to 105°C and is designed for applications requiring fixed inductance in compact form factors.

The 78F6R8J carries an obsolete product status. Identifying suitable substitute components is necessary to maintain design continuity and ensure component availability for new production runs, repairs, and system upgrades.

Substiute Parts

78F6R8J

Bourns Inc.In Stock: 118578F6R8J Datasheet

Current PartRFQ

8230-40-RC

Bourns Inc.In Stock: 12158230-40-RC Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 78F6R8J is determined by the following critical parameters:

• Inductance Value: Must be 6.8 µH (exact match required)
• Core Type: Must be ferrite drum core wirewound (same construction)
• Shielding Configuration: Must be unshielded (same electromagnetic profile)
• Mounting and Package: Must be through-hole axial (same form factor and PCB compatibility)
• Operating Temperature Range: Must support -55°C to 105°C minimum
• Test Frequency: Must be characterized at 7.9 MHz

The Bourns 8230-40-RC meets all substitution criteria. While it exhibits higher current rating (245 mA vs. 175 mA), increased DC resistance (2Ohm vs. 450mOhm), and relaxed inductance tolerance (±10% vs. ±5%), these variations remain within acceptable substitution parameters for applications where the 78F6R8J was originally specified.

Parameter Comparison

Engineering Selection Recommendations

The 8230-40-RC is the designated substitute for the obsolete 78F6R8J. Selection should be based on the following factors:

Product Status: The 78F6R8J is obsolete, making the active 8230-40-RC the appropriate choice for ongoing production and new designs.

Regulatory Compliance: The 8230-40-RC is ROHS3 compliant, whereas the 78F6R8J is non-compliant. For applications subject to RoHS regulations, the 8230-40-RC is the required selection.

Electrical Performance: Both components share identical inductance values and test frequencies. The 8230-40-RC provides higher current capacity (245 mA vs. 175 mA) and operates within the same temperature range, making it suitable for applications originally designed around the 78F6R8J specifications.

Physical Compatibility: Both components are through-hole axial packages with compatible form factors for direct PCB substitution.

Frequently Asked Questions (FAQ)

Q: Can the 8230-40-RC be used as a direct replacement for the 78F6R8J?

A: Yes. Both components share the same inductance value (6.8 µH), core material (ferrite), shielding configuration (unshielded), mounting type (through-hole), and package style (axial). The 8230-40-RC is rated for higher current and has lower DC resistance, making it electrically compatible for applications originally specified with the 78F6R8J.

Q: What is the difference in DC resistance between these parts?

A: The 78F6R8J has a maximum DC resistance of 450mOhm, while the 8230-40-RC has a maximum of 2Ohm. This difference affects power dissipation characteristics. Applications sensitive to DC resistance should account for this variation in thermal and efficiency calculations.

Q: Does the inductance tolerance difference matter?

A: The 78F6R8J has ±5% tolerance, while the 8230-40-RC has ±10% tolerance. For circuits requiring tighter inductance control, the tolerance difference should be evaluated against circuit performance requirements.

Q: Are there physical size differences?

A: Yes. The 78F6R8J measures 0.110" diameter × 0.280" length (2.79mm × 7.11mm), while the 8230-40-RC measures 0.120" diameter × 0.300" length (3.05mm × 7.62mm). Both are through-hole axial components with compatible PCB footprints, though the 8230-40-RC is slightly larger.

Q: What is the current rating difference?

A: The 78F6R8J is rated for 175 mA, while the 8230-40-RC is rated for 245 mA. The higher rating of the 8230-40-RC provides additional design margin for applications operating near the original current limit.

Q: Is the 8230-40-RC RoHS compliant?

A: Yes. The 8230-40-RC is ROHS3 compliant, whereas the 78F6R8J is non-compliant. For applications subject to RoHS directives, the 8230-40-RC is the required selection.