70F915AI-RC Equivalent & Substitute Parts

Part Overview

The 70F915AI-RC is a 91 µH unshielded drum core wirewound inductor manufactured by Bourns Inc., rated for 156 mA maximum current with 4.92Ohm DC resistance. This through-hole axial component operates across -55°C to 105°C and is ROHS3 compliant. The product is currently obsolete, making equivalent substitutes necessary for ongoing design support and procurement.

Substiute Parts

70F915AI-RC

Bourns Inc.In Stock: 85970F915AI-RC Datasheet

Current PartRFQ

1537R-74J

API Delevan Inc.In Stock: 9241537R-74J Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 70F915AI-RC is based on the following critical parameters:

• Inductance Value: 91 µH (exact match required)
• Tolerance: ±5% (ensures specification compliance)
• Current Rating: Minimum 154 mA (substitute must support circuit current demands)
• DC Resistance: Maximum 4.3Ohm to 4.92Ohm (affects power dissipation and circuit performance)
• Core Material: Iron (maintains magnetic properties)
• Shielding: Unshielded (matches EMI characteristics)
• Operating Temperature Range: -55°C ~ 105°C (ensures thermal compatibility)
• Mounting Type: Through Hole Axial (maintains PCB compatibility)
• Compliance: ROHS3 compliant (regulatory requirement)

The 1537R-74J by API Delevan Inc. meets all substitution criteria with equivalent electrical specifications and compliance certifications.

Parameter Comparison

Engineering Selection Recommendations

The 1537R-74J is a direct functional equivalent for the obsolete 70F915AI-RC based on the following criteria:

• Electrical Equivalence: Both components provide 91 µH inductance with ±5% tolerance, meeting circuit design specifications.
• Current Capacity: The 1537R-74J rated at 154 mA is compatible with the original 156 mA specification, with negligible margin difference acceptable for most applications.
• Improved Performance: The substitute exhibits lower DC resistance (4.3Ohm vs 4.92Ohm), higher Q factor (50 vs 41 @ 2.5MHz), and higher self-resonant frequency (10MHz vs 6.7MHz), providing performance benefits.
• Regulatory Compliance: Both components are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements.
• Thermal Compatibility: Identical operating temperature range (-55°C ~ 105°C) ensures thermal performance equivalence.
• PCB Integration: Through-hole axial mounting is preserved; however, physical dimensions differ, requiring PCB layout verification.

Frequently Asked Questions (FAQ)

Q: Can the 1537R-74J directly replace the 70F915AI-RC without PCB modification?

A: Electrical substitution is valid. However, physical dimensions differ (0.180" Dia x 0.250" L vs 0.156" Dia x 0.375" L). PCB layout verification is required to confirm mechanical fit within the existing footprint.

Q: What is the significance of the different core construction (Drum Core vs Molded)?

A: Both are iron-core unshielded inductors with equivalent electrical performance at the specified frequency. The molded construction of the 1537R-74J provides improved mechanical robustness and consistency.

Q: Are there any current rating concerns when substituting?

A: The 1537R-74J is rated at 154 mA versus the original 156 mA. This 2 mA difference is negligible for most circuit applications and does not present a functional limitation.

Q: How do the improved Q factor and self-resonant frequency affect circuit performance?

A: The 1537R-74J exhibits higher Q (50 vs 41) and higher self-resonant frequency (10MHz vs 6.7MHz). These characteristics indicate lower losses and extended frequency response, providing performance benefits or equivalent operation depending on circuit requirements.

Q: What packaging considerations apply to the 1537R-74J?

A: The substitute is supplied in Tape & Reel (TR) packaging, whereas the original was bulk packaged. This affects procurement quantities and handling but does not impact component performance or PCB assembly compatibility.

Q: Are both components compliant with current regulatory standards?

A: Yes. Both the 70F915AI-RC and 1537R-74J are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements for electronic component manufacturing and use.