70F272AF-RC Equivalent & Substitute Parts

Part Overview

The 70F272AF-RC is a 27 mH unshielded drum core wirewound inductor manufactured by Bourns Inc., rated for 45 mA maximum current with 120 Ohm DC resistance. This component is classified as obsolete, making equivalent substitute parts necessary for ongoing design support and procurement continuity. The part is designed for through-hole axial mounting applications requiring ferrite core inductors in the 27 mH range.

Substiute Parts

70F272AF-RC

Bourns Inc.In Stock: 83470F272AF-RC Datasheet

Current PartRFQ

4590R-276J

API Delevan Inc.In Stock: 10134590R-276J Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 70F272AF-RC is determined by the following critical parameters:

• Inductance value: 27 mH (exact match required)
• Tolerance: ±5% (matching tolerance specification)
• Core type: Ferrite drum core, unshielded (same construction)
• Mounting: Through hole axial configuration (physical compatibility)
• Current rating: Must equal or exceed 45 mA minimum requirement
• DC resistance: Lower values acceptable; higher values require circuit validation
• Operating temperature: Must support -55°C minimum; higher maximum ratings acceptable
• Compliance: ROHS3 compliant status maintained

The substitute part 4590R-276J meets these criteria with matching inductance, tolerance, core material, and mounting configuration. The substitute provides superior current handling (170 mA vs. 45 mA) and lower DC resistance (22.7 Ohm vs. 120 Ohm), making it suitable for applications requiring the same inductance value.

Parameter Comparison

Engineering Selection Recommendations

The 4590R-276J from API Delevan Inc. is a direct functional equivalent for the obsolete 70F272AF-RC. Both components share identical inductance values, tolerance specifications, core materials, and mounting configurations. The substitute part maintains ROHS3 compliance and extends the operating temperature range to 125°C, providing additional thermal margin.

The 4590R-276J offers improved electrical performance characteristics with higher current rating capacity (170 mA vs. 45 mA) and significantly lower DC resistance (22.7 Ohm vs. 120 Ohm). These enhancements reduce power dissipation and allow operation in circuits requiring higher current handling without saturation concerns. The active product status of the 4590R-276J ensures long-term availability and supply chain continuity.

Physical dimensions differ between the two parts (0.455" Dia x 0.900" L for the substitute vs. 0.350" Dia x 0.630" L for the original), requiring verification of board layout and mechanical clearance during integration.

Frequently Asked Questions (FAQ)

Q: Can the 4590R-276J directly replace the 70F272AF-RC in existing designs?

A: The 4590R-276J provides electrical equivalence for the 27 mH inductance requirement. Physical dimensions differ, requiring PCB layout verification. The lower DC resistance and higher current rating of the substitute are compatible with circuits designed for the original part.

Q: What is the significance of the lower DC resistance in the substitute part?

A: The 4590R-276J exhibits 22.7 Ohm maximum DC resistance compared to 120 Ohm in the original part. This reduction decreases resistive losses and heat generation in the inductor, improving circuit efficiency. Circuits designed for the higher resistance value will experience improved performance with the substitute.

Q: Are both parts suitable for the same temperature range applications?

A: The 70F272AF-RC operates from -55°C to 105°C, while the 4590R-276J extends to 125°C maximum. The substitute part covers the full operating range of the original and provides additional thermal margin for high-temperature environments.

Q: Do both parts maintain the same compliance certifications?

A: Both the 70F272AF-RC and 4590R-276J are ROHS3 compliant and REACH unaffected, maintaining equivalent regulatory compliance for industrial and commercial applications.

Q: What are the physical mounting considerations when substituting these parts?

A: Both parts use through-hole axial mounting. The substitute is larger (0.455" Dia x 0.900" L vs. 0.350" Dia x 0.630" L), requiring verification that PCB pad spacing and component clearance accommodate the increased dimensions.