78F1R2K Equivalent & Substitute Parts

Part Overview

The 78F1R2K is a 1.2 µH unshielded drum core wirewound inductor manufactured by Bourns Inc., rated for 590 mA with a maximum DC resistance of 180mOhm. This component operates across the temperature range of -55°C to 105°C and is designed for through-hole axial mounting applications. The 78F1R2K is classified as obsolete, making identification of functionally equivalent substitute parts essential for ongoing design support and production continuity.

Substiute Parts

78F1R2K

Bourns Inc.In Stock: 108878F1R2K Datasheet

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8230-22-RC

Bourns Inc.In Stock: 20738230-22-RC Datasheet

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Key Parameters

Substitute Part Grouping Explanation

The 8230-22-RC qualifies as a functional substitute for the 78F1R2K based on the following critical parameters:

• Inductance Value: Both parts specify 1.2 µH with ±10% tolerance
• DC Resistance: Both maintain 180mOhm maximum
• Core Type: Both utilize ferrite drum core construction
• Shielding Configuration: Both are unshielded
• Operating Temperature Range: Both support -55°C ~ 105°C
• Mounting and Package: Both are through-hole axial components
• Test Frequency: Both are characterized at 7.9 MHz

The primary difference is the current rating: the 8230-22-RC supports 825 mA compared to the 78F1R2K's 590 mA rating. This represents an increase in current capacity, making the 8230-22-RC suitable for applications where the original part's current rating is adequate or where higher current margin is beneficial.

Parameter Comparison

Engineering Selection Recommendations

The 8230-22-RC is the appropriate substitute for the obsolete 78F1R2K. The substitute maintains electrical equivalence across all critical inductance and resistance parameters while providing increased current capacity. The 8230-22-RC is classified as active product status, ensuring ongoing availability and supply chain continuity.

From a compliance perspective, the 8230-22-RC achieves ROHS3 compliance, whereas the 78F1R2K is non-compliant. For applications subject to RoHS requirements, the 8230-22-RC is the mandated selection. Both components share identical REACH and ECCN classifications.

Physical dimensions differ slightly: the 8230-22-RC measures 0.120" diameter by 0.300" length compared to the 78F1R2K's 0.110" diameter by 0.280" length. PCB layout and mechanical clearance must be verified for the substitute component.

Frequently Asked Questions (FAQ)

Q: Can the 8230-22-RC directly replace the 78F1R2K in existing designs?

A: The 8230-22-RC is electrically equivalent for inductance, tolerance, and DC resistance. However, physical dimensions are slightly larger. PCB footprint and mechanical clearance must be confirmed before implementation. The higher current rating of the 8230-22-RC does not create compatibility issues in applications designed for the 78F1R2K's 590 mA rating.

Q: What is the significance of the current rating difference?

A: The 8230-22-RC supports 825 mA versus the 78F1R2K's 590 mA. This increased rating provides additional margin in applications operating near the original part's current limit. Applications operating below 590 mA experience no functional difference.

Q: Are there compliance implications for substitution?

A: Yes. The 8230-22-RC is ROHS3 compliant while the 78F1R2K is non-compliant. For designs subject to RoHS directives, the 8230-22-RC is required. Both parts maintain identical REACH and ECCN classifications.

Q: How do the Q factor and self-resonant frequency compare?

A: The 78F1R2K exhibits a Q factor of 40 at 7.9 MHz with a self-resonant frequency of 165 MHz. The 8230-22-RC shows a Q factor of 25 at 7.9 MHz with a self-resonant frequency of 150 MHz. These differences reflect the physical design variations between the two components and should be evaluated within the context of specific circuit requirements.

Q: What packaging considerations apply to the 8230-22-RC?

A: The 8230-22-RC is supplied in bulk packaging. Both components are through-hole axial mount types suitable for wave soldering and manual insertion processes. The slightly larger physical dimensions of the 8230-22-RC require verification of PCB layout compatibility.