78FR22K Equivalent & Substitute Parts

Part Overview

The 78FR22K is a 220 nH unshielded drum core wirewound inductor manufactured by Bourns Inc., rated for 1.025 A with a maximum DC resistance of 80mOhm. This through-hole axial component operates across a temperature range of -55°C to 105°C and is designed for applications requiring fixed inductance in the sub-microhenry range.

The 78FR22K is classified as obsolete. Locating equivalent or substitute components becomes necessary when original stock is depleted or when design requirements allow for compatible alternatives that meet or exceed the original specifications.

Substiute Parts

78FR22K

Bourns Inc.In Stock: 81078FR22K Datasheet

Current PartRFQ

78FR22K-RC

Bourns Inc.In Stock: 581778FR22K-RC Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 78FR22K is determined by the following critical parameters:

• Inductance value: 220 nH with ±10% tolerance
• Core material and type: Ferrite drum core, unshielded
• Mounting configuration: Through hole axial package
• Physical dimensions: 0.110" diameter x 0.280" length
• Operating temperature range: -55°C to 105°C
• Q factor and self-resonant frequency characteristics

The 78FR22K-RC qualifies as a direct substitute based on matching inductance, core type, mounting style, package dimensions, and operating temperature specifications. The substitute part demonstrates improved electrical performance through higher current rating and lower DC resistance, with maintained frequency characteristics.

Parameter Comparison

Engineering Selection Recommendations

The 78FR22K-RC is the qualified substitute for the obsolete 78FR22K. Both components share identical inductance specifications, core construction, mounting configuration, and physical dimensions, ensuring direct compatibility in circuit applications.

The 78FR22K-RC offers enhanced performance characteristics: current rating increased from 1.025 A to 1.15 A and DC resistance reduced from 80mOhm maximum to 75mOhm maximum. These improvements provide additional design margin without compromising frequency response or temperature stability.

The 78FR22K-RC holds active product status with RoHS3 compliance, whereas the original 78FR22K is obsolete and RoHS non-compliant. Selection of the 78FR22K-RC aligns with current regulatory requirements and ensures long-term component availability.

Frequently Asked Questions (FAQ)

Q: Can the 78FR22K-RC be used as a direct replacement for the 78FR22K?

A: Yes. Both components maintain identical inductance values, core materials, mounting types, and physical dimensions. The 78FR22K-RC is electrically and mechanically compatible with the 78FR22K in all circuit applications.

Q: What are the differences between these two parts?

A: The 78FR22K-RC provides improved electrical performance with higher current rating (1.15 A versus 1.025 A) and lower DC resistance (75mOhm maximum versus 80mOhm maximum). The 78FR22K-RC is active and RoHS3 compliant, while the 78FR22K is obsolete and RoHS non-compliant.

Q: Are the physical packages identical?

A: Yes. Both components use the same through-hole axial package with dimensions of 0.110" diameter x 0.280" length (2.79mm x 7.11mm). PCB layout and mounting procedures remain unchanged.

Q: Do frequency characteristics differ between these parts?

A: No. Both components maintain identical Q factor (40 @ 25MHz) and self-resonant frequency (380 MHz) specifications.

Q: What is the operating temperature range for both parts?

A: Both the 78FR22K and 78FR22K-RC operate across -55°C to 105°C.