Bourns 78F2R2K Equivalent & Substitute Parts

Part Overview

The Bourns 78F2R2K is a 2.2 µH unshielded drum core wirewound inductor rated for 395 mA with a maximum DC resistance of 280mOhm. This through-hole axial component operates across the temperature range of -55°C to 105°C and is designed for applications requiring fixed inductance in compact form factors.

The 78F2R2K is classified as obsolete. Locating equivalent or substitute components is necessary to support ongoing production, maintenance, and repair of systems utilizing this inductor specification.

Substiute Parts

78F2R2K

Bourns Inc.In Stock: 86378F2R2K Datasheet

Current PartRFQ

78F2R2K-RC

Bourns Inc.In Stock: 701778F2R2K-RC Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 78F2R2K is determined by the following critical parameters:

• Inductance Value: Must be 2.2 µH with ±10% tolerance
• Core Type and Shielding: Ferrite drum core, unshielded construction
• Mounting and Package: Through-hole axial configuration with identical physical dimensions
• Operating Temperature Range: -55°C to 105°C
• Frequency Characteristics: Q @ 7.9 MHz and self-resonant frequency at 110 MHz

The substitute part 78F2R2K-RC maintains all core electrical and mechanical specifications while offering improved current handling capability and enhanced compliance status.

Parameter Comparison

Engineering Selection Recommendations

The 78F2R2K-RC is the direct substitute for the obsolete 78F2R2K. Both components share identical inductance, tolerance, core material, shielding configuration, frequency characteristics, and physical dimensions. The substitute part provides the following advantages:

• Active Product Status: The 78F2R2K-RC is actively manufactured and supported, ensuring long-term availability and supply chain continuity.
• Improved Compliance: The substitute achieves ROHS3 compliance, whereas the original part is RoHS non-compliant.
• Enhanced Current Capability: The 78F2R2K-RC supports 630 mA current rating compared to 395 mA, providing additional design margin.
• Lower DC Resistance: The substitute exhibits 250mOhm maximum DC resistance versus 280mOhm, resulting in reduced power dissipation.

Selection of the 78F2R2K-RC is appropriate for applications where the original 78F2R2K specification is required and regulatory compliance is a consideration.

Frequently Asked Questions (FAQ)

Q: Can the 78F2R2K-RC be used as a direct replacement for the 78F2R2K?

A: Yes. Both parts maintain identical inductance value, tolerance, core material, shielding type, frequency characteristics, and physical dimensions. The substitute is mechanically and electrically compatible for through-hole axial mounting applications.

Q: What are the key differences between these two parts?

A: The primary differences are product status, compliance certification, current rating, and DC resistance. The 78F2R2K-RC is an active product with ROHS3 compliance, supports higher current (630 mA vs. 395 mA), and exhibits lower DC resistance (250mOhm vs. 280mOhm).

Q: Are there any thermal or frequency performance differences?

A: No. Both parts operate across the identical temperature range (-55°C to 105°C) and exhibit the same Q factor (50 @ 7.9MHz) and self-resonant frequency (110MHz).

Q: Does the improved current rating of the 78F2R2K-RC affect circuit compatibility?

A: No. Higher current rating and lower DC resistance are beneficial characteristics that do not compromise compatibility. These improvements reduce thermal stress and power dissipation in the circuit.

Q: What packaging options are available for the 78F2R2K-RC?

A: The 78F2R2K-RC is supplied in bulk packaging, whereas the original 78F2R2K was supplied with standard packaging. Both maintain the same axial through-hole form factor and physical dimensions.