Bourns 78F2R7K Equivalent & Substitute Parts

Part Overview

The Bourns 78F2R7K is a 2.7 µH unshielded drum core wirewound inductor rated for 355 mA with a maximum DC resistance of 300mOhm. This through-hole axial component operates across -55°C to 105°C and is part of the 78F series. The part is currently obsolete, making identification of suitable alternatives necessary for ongoing design support and production continuity.

Substiute Parts

78F2R7K

Bourns Inc.In Stock: 116378F2R7K Datasheet

Current PartRFQ

78F2R7K-RC

Bourns Inc.In Stock: 875378F2R7K-RC Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the 78F2R7K is determined by the following critical parameters:

• Inductance Value: Must be 2.7 µH with ±10% tolerance
• Core Type & Shielding: Ferrite material, unshielded construction
• Mounting & Package: Through-hole axial configuration with matching physical dimensions (0.110" Dia x 0.280" L)
• Operating Temperature Range: -55°C to 105°C
• Frequency Characteristics: Q @ 7.9MHz and self-resonant frequency at 95MHz

The 78F2R7K-RC qualifies as a direct substitute because it maintains identical inductance, core material, shielding, mounting type, package style, physical dimensions, and operating temperature range. The substitute exhibits improved electrical performance through higher current rating and lower DC resistance, with enhanced product status and RoHS compliance.

Parameter Comparison

Engineering Selection Recommendations

The 78F2R7K-RC is the direct substitute for the obsolete 78F2R7K. Both components share identical inductance, tolerance, core material, shielding configuration, mounting type, package style, and physical dimensions. The substitute maintains full compatibility with existing circuit designs while offering improved electrical performance through higher current rating (595 mA vs. 355 mA) and lower DC resistance (280mOhm vs. 300mOhm).

The 78F2R7K-RC carries active product status with ROHS3 compliance, providing long-term availability and regulatory alignment. The substitute is suitable for direct replacement in applications where the original part is no longer available.

Frequently Asked Questions (FAQ)

Q: Can the 78F2R7K-RC replace the 78F2R7K in existing designs?

A: Yes. The 78F2R7K-RC maintains identical inductance value, tolerance, core material, shielding, mounting type, package configuration, and physical dimensions. Both components operate across the same temperature range and exhibit identical Q and self-resonant frequency characteristics.

Q: What are the differences between these parts?

A: The 78F2R7K-RC provides higher current rating (595 mA vs. 355 mA) and lower DC resistance (280mOhm vs. 300mOhm). The substitute is active product status with ROHS3 compliance, while the original is obsolete and RoHS non-compliant.

Q: Are the physical dimensions identical?

A: Yes. Both the 78F2R7K and 78F2R7K-RC measure 0.110" diameter by 0.280" length (2.79mm x 7.11mm) in axial configuration, ensuring identical PCB footprint and mounting compatibility.

Q: Does the improved current rating affect circuit operation?

A: No. The higher current rating of the substitute indicates improved performance margin. Applications designed for the original 355 mA rating operate within the substitute's specifications without modification.

Q: What is the packaging difference?

A: The 78F2R7K is supplied in standard packaging, while the 78F2R7K-RC is supplied in bulk packaging. Both are through-hole axial components with identical electrical and mechanical specifications.