Equivalent & Substitute Parts for 70F472AF-RC

Part Overview

The 70F472AF-RC is a 47 mH unshielded drum core wirewound inductor manufactured by Bourns Inc., rated for 38 mA maximum current with 168 Ohm DC resistance. This through-hole axial component operates across -55°C to 105°C and is classified as obsolete. Due to its obsolete status and limited current availability, identifying equivalent substitute parts is essential for ongoing design support and production continuity.

Substiute Parts

70F472AF-RC

Bourns Inc.In Stock: 69170F472AF-RC Datasheet

Current PartRFQ

B82144A2476J000

EPCOS - TDK ElectronicsIn Stock: 28688B82144A2476J000 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 70F472AF-RC is determined by the following critical parameters:

• Inductance Value: Must be 47 mH (±5% tolerance)
• Core Type: Ferrite drum core, wirewound construction
• Shielding: Unshielded configuration
• Mounting: Through-hole axial package
• Current Rating: Must support minimum 38 mA operation
• DC Resistance: Acceptable range based on circuit requirements
• Operating Temperature: Must cover -55°C to 105°C minimum
• Compliance: ROHS3 compliance required

The B82144A2476J000 from EPCOS - TDK Electronics meets these core substitution criteria with matching inductance, core material, shielding type, and mounting configuration.

Parameter Comparison

Engineering Selection Recommendations

The B82144A2476J000 is qualified as a substitute for the 70F472AF-RC based on the following factors:

Compliance and Availability: The B82144A2476J000 maintains ROHS3 compliance and is currently in active production status with substantial inventory availability (28,625 pcs), ensuring long-term supply continuity compared to the obsolete 70F472AF-RC.

Electrical Compatibility: Both inductors share identical inductance values (47 mH) and tolerance specifications (±5%), with matching ferrite core construction and unshielded axial configuration. The substitute operates across an extended temperature range (-55°C to 125°C), providing broader environmental coverage than the original part.

Design Considerations: The B82144A2476J000 exhibits a 30 mA current rating versus the 70F472AF-RC's 38 mA rating, and higher DC resistance (230 Ohm Max versus 168 Ohm Max). Circuit designs operating at or below 30 mA with acceptable power dissipation at the higher resistance value are suitable for direct substitution. The lower Q factor (40 versus 57) and reduced self-resonant frequency (180 kHz versus 206 kHz) should be evaluated in frequency-dependent applications.

Physical Compatibility: Both parts use through-hole axial mounting with compatible footprints, enabling direct PCB layout substitution without redesign.

Frequently Asked Questions (FAQ)

Q: Can the B82144A2476J000 directly replace the 70F472AF-RC in all applications?

A: Direct substitution is valid for circuits operating at 30 mA or below. Applications requiring the full 38 mA rating of the original part require circuit re-evaluation. The higher DC resistance of the substitute will increase power dissipation proportionally to the square of the current.

Q: What is the impact of the different DC resistance values?

A: The B82144A2476J000 has 230 Ohm maximum DC resistance compared to 168 Ohm maximum for the 70F472AF-RC. At 30 mA, this results in approximately 6.9 mW versus 4.8 mW power dissipation respectively. Circuit designs must account for this additional heat generation.

Q: Are there physical dimension differences between these parts?

A: Yes. The 70F472AF-RC measures 0.380" diameter × 0.630" length (9.65mm × 16.00mm), while the B82144A2476J000 measures 0.205" diameter × 0.472" length (5.20mm × 12.00mm). The substitute is significantly smaller and will fit existing through-hole footprints with clearance margin.

Q: Does the extended operating temperature range of the substitute provide additional benefit?

A: The B82144A2476J000 operates to 125°C versus 105°C for the original part, providing 20°C additional thermal margin. This is beneficial for applications in elevated ambient or high-power environments, though it does not extend the lower temperature limit.

Q: What compliance certifications apply to both parts?

A: Both the 70F472AF-RC and B82144A2476J000 are ROHS3 compliant. The B82144A2476J000 is REACH Affected, while the original part is REACH Unaffected. Both carry EAR99 ECCN classification and 8504.50.8000 HTSUS code.