AX02-304R6 Equivalent & Substitute Parts Reference

Part Overview

The AX02-304R6 is a 4.6 µH shielded drum core wirewound inductor manufactured by Triad Magnetics, rated for 9 A continuous current with a maximum DC resistance of 8.3 mOhm. This surface mount component is designed for applications requiring compact, shielded inductance in power conversion and filtering circuits. The part is currently active in production with full RoHS3 compliance. Substitute parts are identified when equivalent inductance values, current ratings, and shielding characteristics are required but the original part is unavailable or when alternative packaging or thermal specifications better suit application requirements.

Substiute Parts

AX02-304R6

Triad MagneticsIn Stock: 1166AX02-304R6 Datasheet

Current PartRFQ

SRP1250-4R7M

Bourns Inc.In Stock: 25950SRP1250-4R7M Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the AX02-304R6 are qualified based on the following criteria:

Primary Substitution Parameters:

• Inductance value within ±20% tolerance band (4.6 µH nominal allows 3.68 µH to 5.52 µH range)
• Current rating equal to or greater than 9 A continuous
• Saturation current (Isat) equal to or greater than 14 A
• DC resistance (DCR) at or below 8.3 mOhm maximum
• Shielded construction
• Surface mount configuration
• Drum core wirewound type
• Operating temperature range encompassing -40°C to 85°C minimum

Identified Substitute: The SRP1250-4R7M from Bourns Inc. qualifies as a substitute. The inductance value of 4.7 µH falls within the ±20% tolerance specification relative to the 4.6 µH nominal value. The current rating of 12 A exceeds the 9 A requirement, and the saturation current of 27 A provides additional margin. The part maintains shielded drum core wirewound construction with surface mount configuration.

Parameter Comparison

Engineering Selection Recommendations

AX02-304R6 Selection Criteria:

• Primary choice when ferrite core material is specified or required for EMI performance characteristics
• Preferred when PCB layout requires the specific footprint dimensions of 13.30 mm x 15.00 mm
• Suitable for applications with thermal constraints where the lower operating temperature maximum of 85°C is acceptable
• Recommended when box packaging is required for inventory or handling procedures
• Active product status ensures continued availability and supply chain stability

SRP1250-4R7M Selection Criteria:

• Acceptable substitute when iron core material is compatible with circuit design
• Suitable for applications requiring extended operating temperature range up to 150°C
• Applicable when lower profile height of 5.20 mm provides PCB space advantages
• Compatible when tape and reel packaging aligns with manufacturing processes
• Higher current rating (12 A) and saturation current (27 A) provide additional design margin
• Higher DC resistance (15 mOhm vs. 8.3 mOhm) requires thermal analysis to confirm acceptable power dissipation

Compliance Status: Both parts maintain ROHS3 compliance and REACH unaffected status, meeting regulatory requirements for equivalent substitution in compliant applications.

Frequently Asked Questions (FAQ)

Q: Can the SRP1250-4R7M directly replace the AX02-304R6 without circuit modification?

A: The SRP1250-4R7M is electrically compatible within the inductance tolerance specification (4.7 µH vs. 4.6 µH nominal, both ±20%). However, the higher DC resistance (15 mOhm vs. 8.3 mOhm) will increase power dissipation by approximately 3.3 mW at 9 A continuous current. Thermal analysis is required to confirm acceptable temperature rise in the application. Physical dimensions differ, requiring PCB layout verification.

Q: What is the significance of the different core materials (ferrite vs. iron)?

A: The AX02-304R6 uses ferrite core material, while the SRP1250-4R7M uses iron core material. Core material affects frequency response, temperature coefficient, and EMI characteristics. Ferrite cores typically provide better high-frequency performance and lower core losses at elevated frequencies. Iron cores offer higher saturation flux density and better low-frequency stability. Selection depends on the specific frequency range and performance requirements of the application.

Q: Are the physical dimensions compatible with the same PCB footprint?

A: No. The AX02-304R6 measures 13.30 mm (L) x 15.00 mm (W) x 6.50 mm (H), while the SRP1250-4R7M measures 13.90 mm (L) x 13.50 mm (W) x 5.20 mm (H). The substitute is narrower and lower profile but slightly longer. PCB layout must be verified to confirm the substitute fits within the available space and does not create clearance conflicts with adjacent components.

Q: What packaging considerations apply to these parts?

A: The AX02-304R6 is supplied in box packaging, suitable for manual assembly or small-volume production. The SRP1250-4R7M is supplied in tape and reel (TR) format, optimized for automated pick-and-place assembly. Packaging selection depends on manufacturing process requirements and inventory management procedures.

Q: How does the higher current rating of the SRP1250-4R7M affect substitution?

A: The SRP1250-4R7M is rated for 12 A continuous current versus 9 A for the AX02-304R6, with saturation current of 27 A versus 14 A. This provides additional design margin and allows the substitute to handle transient current spikes with greater headroom. The higher ratings do not create compatibility issues; they represent an improvement in current handling capability.

Q: Is the extended operating temperature range of the SRP1250-4R7M (-55°C to 150°C) a concern?

A: No. The extended temperature range of the SRP1250-4R7M encompasses the AX02-304R6 operating range of -40°C to 85°C. The substitute can operate safely across the full temperature range required by the original part and extends capability to more extreme temperatures if future applications require it.

Q: What is the impact of higher DC resistance on circuit performance?

A: The SRP1250-4R7M DC resistance of 15 mOhm is 1.8 times higher than the AX02-304R6 at 8.3 mOhm. At 9 A continuous current, this results in approximately 3.3 mW additional power dissipation (I²R loss). In filtering or energy storage applications, this may affect efficiency and thermal performance. Circuit simulation or thermal testing is recommended to confirm acceptable performance in the specific application.