78FR27K Equivalent & Substitute Parts

Part Overview

The 78FR27K is a 270 nH unshielded drum core wirewound inductor manufactured by Bourns Inc., rated for 950 mA with a maximum DC resistance of 80 mOhm. This through-hole axial component operates across the temperature range of -55°C to 105°C and is designed for applications requiring low inductance values with high current capacity. The part is currently obsolete, making identification of suitable substitute components essential for ongoing production and maintenance applications.

Substiute Parts

78FR27K

Bourns Inc.In Stock: 84978FR27K Datasheet

Current PartRFQ

8230-06-RC

Bourns Inc.In Stock: 12008230-06-RC Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 78FR27K is based on the following critical parameters that must remain consistent or within acceptable operational limits:

• Inductance Value: 270 nH (±10% tolerance maintained)
• Mounting Configuration: Through-hole axial package
• Operating Temperature Range: -55°C to 105°C
• Shielding Type: Unshielded
• Inductance Test Frequency: 25 MHz

The substitute part 8230-06-RC maintains the same inductance value, tolerance, temperature range, shielding classification, and mounting type. While the substitute exhibits different core material (phenolic vs. ferrite), higher DC resistance (160 mOhm vs. 80 mOhm), and slightly lower current rating (875 mA vs. 950 mA), these variations remain within acceptable parameters for equivalent functionality in applications where the 78FR27K was originally specified.

Parameter Comparison

Engineering Selection Recommendations

The 8230-06-RC serves as an active substitute for the obsolete 78FR27K. Both components are manufactured by Bourns Inc. and maintain identical inductance specifications, tolerance, temperature operating range, and through-hole axial mounting configuration.

The primary distinction is product status: the 78FR27K is obsolete, while the 8230-06-RC is active and currently in production. The 8230-06-RC additionally provides ROHS3 compliance, addressing regulatory requirements for new designs and manufacturing environments where RoHS compliance is mandated.

Designers should evaluate application-specific requirements regarding current capacity and DC resistance. The 8230-06-RC exhibits a 75 mA reduction in current rating and a 100 mOhm increase in maximum DC resistance compared to the original 78FR27K. These parameter differences must be assessed against circuit performance requirements, thermal dissipation budgets, and voltage drop tolerances before implementation.

Frequently Asked Questions (FAQ)

Q: Can the 8230-06-RC directly replace the 78FR27K in existing designs?

A: Both parts maintain identical inductance values (270 nH), tolerance (±10%), operating temperature range (-55°C to 105°C), and through-hole axial mounting configuration. However, the 8230-06-RC has a lower current rating (875 mA vs. 950 mA) and higher DC resistance (160 mOhm vs. 80 mOhm). Verify that your application's current requirements do not exceed 875 mA and that the increased DC resistance does not negatively impact circuit performance.

Q: What is the significance of the core material difference between these parts?

A: The 78FR27K uses a ferrite drum core, while the 8230-06-RC uses a phenolic core. Both maintain the same inductance value and unshielded classification. The core material difference contributes to variations in Q factor (40 vs. 33 at 25 MHz) and self-resonant frequency (360 MHz vs. 430 MHz).

Q: Why is RoHS compliance important for this substitution?

A: The 78FR27K is RoHS non-compliant, while the 8230-06-RC is ROHS3 compliant. For new production runs or applications subject to RoHS regulations, the 8230-06-RC is the appropriate selection. Existing legacy systems may continue using non-compliant components if regulatory exemptions apply.

Q: Are there any package or dimensional considerations?

A: Both parts are through-hole axial components with similar physical dimensions. The 78FR27K measures 0.110" diameter × 0.280" length, while the 8230-06-RC measures 0.120" diameter × 0.300" length. These minor dimensional differences are typical for equivalent inductor designs and should not present PCB layout compatibility issues.

Q: What should I verify before implementing the 8230-06-RC as a substitute?

A: Confirm that your circuit's maximum current requirement does not exceed 875 mA. Evaluate whether the increased DC resistance (160 mOhm vs. 80 mOhm) affects voltage drop calculations and thermal performance. Verify that the slightly lower Q factor (33 vs. 40 at 25 MHz) does not impact filter performance or signal integrity in your specific application.