78F1R5K Equivalent & Substitute Parts

Part Overview

The Bourns 78F1R5K is a 1.5 µH unshielded drum core wirewound inductor rated for 535 mA with a maximum DC resistance of 200mOhm. 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 78F1R5K is classified as obsolete, making identification of suitable substitute components essential for ongoing production and maintenance applications.

Substiute Parts

78F1R5K

Bourns Inc.In Stock: 94278F1R5K Datasheet

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8230-24-RC

Bourns Inc.In Stock: 17618230-24-RC Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 78F1R5K is determined by the following critical parameters:

• Inductance Value: Must be 1.5 µH with ±10% tolerance
• Core Type and Shielding: Ferrite material, unshielded configuration
• Mounting and Package: Through-hole axial mounting required
• Operating Temperature: Must support -55°C to 105°C range
• Test Frequency: 7.9 MHz measurement standard

The substitute part 8230-24-RC meets all core electrical and mechanical requirements. While it exhibits higher current rating (745 mA vs. 535 mA) and slightly elevated DC resistance (220mOhm vs. 200mOhm), these parameters remain within acceptable substitution boundaries for the specified inductance and form factor. The 8230-24-RC maintains identical inductance, tolerance, core material, shielding configuration, and operating temperature range.

Parameter Comparison

Engineering Selection Recommendations

The 8230-24-RC serves as a direct substitute for the obsolete 78F1R5K based on electrical and mechanical compatibility. The substitute maintains identical inductance specifications and core characteristics while offering active product status and ROHS3 compliance. The higher current rating of the 8230-24-RC (745 mA) provides additional margin relative to the original 535 mA specification. The marginal increase in DC resistance (20mOhm differential) remains within acceptable engineering tolerances for fixed inductor applications.

Selection of the 8230-24-RC eliminates obsolescence risk and aligns with current regulatory compliance requirements. Both components share identical operating temperature ranges, test frequencies, and axial through-hole form factors, ensuring mechanical and thermal compatibility in existing circuit designs.

Frequently Asked Questions (FAQ)

Q: Can the 8230-24-RC replace the 78F1R5K in existing designs?

A: Yes. Both components share identical inductance values (1.5 µH), tolerance specifications (±10%), core materials (ferrite), shielding configurations (unshielded), mounting types (through-hole axial), and operating temperature ranges (-55°C to 105°C). The substitute is electrically and mechanically compatible.

Q: What is the significance of the higher current rating on the 8230-24-RC?

A: The 8230-24-RC is rated for 745 mA compared to the 78F1R5K's 535 mA. This higher rating provides additional current-handling capacity and represents a design improvement. Applications operating at or below 535 mA experience no adverse effects from this specification difference.

Q: Does the 20mOhm increase in DC resistance affect circuit performance?

A: The 8230-24-RC specifies 220mOhm maximum DC resistance versus the 78F1R5K's 200mOhm maximum. This 10% differential is typical in component substitution and remains within acceptable tolerances for fixed inductor applications. Circuit designs accounting for the original 200mOhm specification will experience minimal impact.

Q: What is the advantage of selecting the 8230-24-RC over the obsolete 78F1R5K?

A: The 8230-24-RC carries active product status, ensuring long-term availability and supply chain reliability. It meets ROHS3 compliance requirements, whereas the 78F1R5K is non-compliant. Both factors support regulatory adherence and production continuity.

Q: Are there physical dimension differences between these components?

A: The 78F1R5K measures 0.110" diameter by 0.280" length (2.79mm x 7.11mm). The 8230-24-RC measures 0.120" diameter by 0.300" length (3.05mm x 7.62mm). Both maintain axial through-hole form factors. PCB layout verification is recommended to confirm clearance compatibility in space-constrained applications.