5526-11 Equivalent & Substitute Parts Reference

Part Overview

The 5526-11 is a 491 nH unshielded wirewound surface mount inductor rated for 2 A continuous current, manufactured by API Delevan Inc. This component is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. The part operates across an industrial temperature range of -55°C to 125°C and demonstrates a Q factor of 95 at 50 MHz with a self-resonant frequency of 535 MHz.

Substiute Parts

5526-11

API Delevan Inc.In Stock: 11965526-11 Datasheet

Current PartRFQ

AIAC-4125C-R491J-T

Abracon LLCIn Stock: 1554AIAC-4125C-R491J-T Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 5526-11 are identified based on strict electrical and mechanical parameter matching. The following criteria determine substitution eligibility:

Mandatory Matching Parameters:

• Inductance value: 491 nH ±5%
• Current rating: minimum 2 A
• Core material: Air (unshielded)
• Mounting type: Surface Mount
• Inductance tolerance: ±5%

Compatible Variation Parameters:

• Operating temperature range may extend beyond the original specification
• DC resistance (DCR) may be specified on substitute parts
• Q factor may vary within acceptable limits for the application frequency
• Self-resonant frequency may differ
• Physical dimensions may vary within nonstandard package constraints
• Product status may transition from obsolete to active

The AIAC-4125C-R491J-T from Abracon LLC meets all mandatory matching criteria and qualifies as a direct electrical equivalent.

Parameter Comparison

Engineering Selection Recommendations

The AIAC-4125C-R491J-T qualifies as an electrical equivalent for the 5526-11 based on matching inductance, tolerance, current rating, core material, and mounting type. The substitute part offers the following advantages:

Compliance Status: The AIAC-4125C-R491J-T is ROHS3 compliant, whereas the 5526-11 is non-compliant. For applications subject to RoHS regulations, the substitute part is required.

Product Availability: The 5526-11 is classified as obsolete. The AIAC-4125C-R491J-T is active and available in production quantities (1479 Pcs in stock), ensuring supply chain continuity.

Operating Temperature Consideration: The substitute part operates from -40°C to 125°C, compared to the original -55°C to 125°C range. Applications requiring operation below -40°C must retain the original part or identify alternative sources.

Physical Dimensions: The AIAC-4125C-R491J-T is smaller (9.00mm x 4.40mm x 5.00mm) compared to the 5526-11 (10.67mm x 6.35mm x 5.97mm). Board layout verification is required to confirm fit within existing footprints.

DC Resistance: The substitute specifies a maximum DCR of 40 mOhm, providing defined thermal performance. The original part does not specify DCR, making this a measurable improvement for thermal analysis.

Frequently Asked Questions (FAQ)

Q: Can the AIAC-4125C-R491J-T be used as a direct replacement for the 5526-11 in all applications?

A: The AIAC-4125C-R491J-T is electrically equivalent for inductance, current rating, and core characteristics. However, two factors require verification: (1) Operating temperature range—if your application requires operation below -40°C, the substitute is not suitable; (2) Physical dimensions—the substitute is smaller and must fit within your existing PCB footprint.

Q: What is the significance of the different self-resonant frequencies (535 MHz vs. 400 MHz)?

A: Self-resonant frequency defines the upper frequency limit where the inductor behaves as intended. The 5526-11 has a higher SRF of 535 MHz, while the AIAC-4125C-R491J-T has 400 MHz. For applications operating below 400 MHz, both parts are suitable. Applications requiring operation between 400 MHz and 535 MHz must use the original part or verify substitute performance through testing.

Q: Why is the substitute part smaller in physical dimensions?

A: The AIAC-4125C-R491J-T uses optimized winding geometry and manufacturing techniques to achieve the same inductance value in a more compact form factor. This is a design improvement that reduces board space requirements.

Q: Does the RoHS3 compliance of the substitute part affect electrical performance?

A: No. RoHS3 compliance relates to material composition and environmental regulations, not electrical performance. The substitute part maintains equivalent electrical characteristics while meeting modern regulatory requirements.

Q: What is the impact of the specified 40 mOhm DCR on the substitute part?

A: The DCR specification on the AIAC-4125C-R491J-T provides defined resistive losses. The original 5526-11 does not specify DCR, making direct comparison impossible. For thermal analysis and power dissipation calculations, use the 40 mOhm value for the substitute part.

Q: Can I use the substitute part in existing designs without PCB modifications?

A: PCB footprint compatibility must be verified. The substitute part is physically smaller (9.00mm x 4.40mm) compared to the original (10.67mm x 6.35mm). If your PCB footprint is designed for the larger original part, the substitute will fit but may require mechanical verification to ensure proper solder joint formation and mechanical stability.

Q: Is the substitute part available in the same packaging format?

A: No. The 5526-11 uses nonstandard packaging, while the AIAC-4125C-R491J-T is supplied in Tape & Reel (TR) format. This is advantageous for automated assembly processes and provides better supply chain standardization.