74F125AP-RC Equivalent & Substitute Parts

Part Overview

The 74F125AP-RC is a 12 µH unshielded wirewound inductor manufactured by Bourns Inc., rated for 200 mA maximum current with 3.6Ohm DC resistance. This component is classified as obsolete, making equivalent substitute parts necessary for ongoing design support and procurement continuity. The part operates across the industrial temperature range of -55°C to 125°C and is mounted through-hole in axial configuration.

Substiute Parts

74F125AP-RC

Bourns Inc.In Stock: 102674F125AP-RC Datasheet

Current PartRFQ

1945R-09K

API Delevan Inc.In Stock: 8061945R-09K Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 74F125AP-RC is determined by the following critical parameters:

• Inductance Value: Must be 12 µH with ±10% tolerance to maintain circuit functionality
• Mounting Configuration: Through-hole axial package required for mechanical compatibility
• Operating Temperature Range: Must support -55°C to 125°C minimum
• Shielding Classification: Unshielded designation must be maintained
• Regulatory Compliance: ROHS3 compliance and REACH unaffected status required

The substitute part 1945R-09K from API Delevan Inc. meets these core substitution criteria. While the substitute exhibits different construction type (molded vs. wirewound), core material (iron vs. phenolic), current rating (590 mA vs. 200 mA), and DC resistance (810mOhm vs. 3.6Ohm), these variations remain within acceptable parameters for equivalent functionality at the specified 12 µH inductance value.

Parameter Comparison

Engineering Selection Recommendations

The 1945R-09K serves as a functional equivalent for the obsolete 74F125AP-RC based on matching inductance value, tolerance, operating temperature range, and regulatory compliance status. Both parts maintain ROHS3 compliance and REACH unaffected designation, ensuring regulatory continuity in applications requiring these certifications.

The substitute part is currently in active production status with confirmed inventory availability, providing supply chain stability compared to the obsolete original part. The through-hole axial mounting configuration is identical, permitting direct mechanical substitution without PCB redesign.

Circuit designers must evaluate application-specific requirements regarding current headroom and DC resistance characteristics. The 1945R-09K provides higher current rating (590 mA vs. 200 mA) and lower DC resistance (810mOhm vs. 3.6Ohm), which may alter thermal performance and voltage drop characteristics in the application circuit.

Frequently Asked Questions (FAQ)

Q: Can the 1945R-09K directly replace the 74F125AP-RC without circuit modification?

A: Direct mechanical substitution is possible due to identical through-hole axial mounting configuration and matching 12 µH inductance value with ±10% tolerance. However, circuit performance must be evaluated for the differences in DC resistance and current rating specifications.

Q: What is the primary reason for seeking a substitute for the 74F125AP-RC?

A: The 74F125AP-RC is classified as obsolete, making long-term procurement unavailable. The 1945R-09K is in active production status, ensuring supply continuity.

Q: Are both parts compliant with current regulatory requirements?

A: Yes. Both the 74F125AP-RC and 1945R-09K maintain ROHS3 compliance and REACH unaffected status, meeting current environmental and regulatory standards.

Q: How do the DC resistance values affect substitution suitability?

A: The 1945R-09K exhibits significantly lower DC resistance (810mOhm vs. 3.6Ohm). Applications sensitive to inductor losses or thermal dissipation must evaluate whether this reduction impacts circuit performance or thermal management requirements.

Q: What is the difference between wirewound and molded inductor construction?

A: The 74F125AP-RC uses wirewound construction with phenolic core material, while the 1945R-09K uses molded construction with iron core material. Both achieve the same 12 µH inductance value and unshielded classification required for substitution.

Q: Are the packaging formats compatible?

A: Both parts use through-hole axial packaging. The 74F125AP-RC is supplied in standard packaging, while the 1945R-09K is supplied in Tape & Reel (TR) format. Physical dimensions are similar (5.08mm x 12.70mm vs. 4.90mm x 11.35mm), permitting PCB compatibility.