AX97-303R3 Equivalent & Substitute Parts

Part Overview

The AX97-303R3 is a 3.3 µH unshielded drum core wirewound inductor manufactured by Triad Magnetics, rated for 6.6 A continuous current with a maximum DC resistance of 20mOhm. This surface mount component operates across the temperature range of -40°C to 85°C and is ROHS3 compliant. The part is currently active in production with 828 units in stock. Substitute parts are identified when equivalent inductance values, current ratings, and core materials are available from alternative manufacturers, enabling procurement flexibility and supply chain continuity.

Substiute Parts

AX97-303R3

Triad MagneticsIn Stock: 898AX97-303R3 Datasheet

Current PartRFQ

SRR1005-3R3M

Bourns Inc.In Stock: 1436SRR1005-3R3M Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the AX97-303R3 are identified based on the following critical parameters that determine functional equivalence:

Primary Matching Criteria:

• Inductance value: 3.3 µH (exact match required)
• Inductance tolerance: ±20% (matching specification)
• Core material: Ferrite drum core wirewound construction
• Mounting type: Surface mount
• Regulatory compliance: ROHS3 compliant

Secondary Considerations:

• Current rating: Substitute must support minimum 6.6 A continuous current
• DC resistance: Lower or equal to 20mOhm preferred for thermal performance
• Operating temperature: Minimum -40°C to 85°C range
• Package type: Nonstandard SMD form factor

The SRR1005-3R3M from Bourns Inc. matches the primary inductance and core material specifications. However, the substitute exhibits a reduced current rating (3.3 A versus 6.6 A) and increased DC resistance (39mOhm versus 20mOhm maximum), which represents a functional limitation in high-current applications.

Parameter Comparison

Engineering Selection Recommendations

Primary Part (AX97-303R3): The AX97-303R3 is recommended for applications requiring the full 6.6 A current rating with minimal DC resistance losses. This part is ROHS3 compliant and actively produced. Selection is appropriate when thermal performance and current capacity are critical design parameters.

Substitute Part (SRR1005-3R3M): The SRR1005-3R3M is suitable only for applications where the required current does not exceed 3.3 A. The increased DC resistance (39mOhm versus 20mOhm) results in higher power dissipation. The shielded construction of the substitute may provide electromagnetic interference mitigation benefits in certain circuit topologies. This part is ROHS3 compliant and available in Tape & Reel packaging for automated assembly. The extended operating temperature range (-40°C to 125°C) provides additional thermal margin.

Compliance Status: Both parts maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory compatibility in target applications.

Frequently Asked Questions (FAQ)

Q: Can the SRR1005-3R3M directly replace the AX97-303R3 in all applications?

A: No. The SRR1005-3R3M has a maximum current rating of 3.3 A, which is 50% lower than the AX97-303R3 rating of 6.6 A. Direct substitution is only valid in circuits where the actual operating current does not exceed 3.3 A.

Q: What is the impact of the increased DC resistance in the substitute part?

A: The SRR1005-3R3M exhibits 39mOhm maximum DC resistance compared to 20mOhm in the AX97-303R3. At full rated current (3.3 A), this results in approximately 0.129 W power dissipation in the substitute versus 0.087 W in the primary part. Thermal design must account for this difference.

Q: Does the shielded construction of the SRR1005-3R3M affect circuit performance?

A: Shielding reduces electromagnetic radiation and susceptibility to external fields. In unshielded applications, the SRR1005-3R3M may exhibit different coupling characteristics. Circuit validation is necessary when shielding properties differ from the original design specification.

Q: Are the physical dimensions compatible between these parts?

A: The parts have similar but not identical dimensions. AX97-303R3: 13.46mm L × 9.40mm W × 5.90mm H (max). SRR1005-3R3M: 12.70mm L × 10.00mm W × 5.20mm H (max). PCB layout verification is required before substitution.

Q: What packaging differences exist between these parts?

A: The AX97-303R3 is supplied in Box packaging, while the SRR1005-3R3M is supplied in Tape & Reel (TR) format. Tape & Reel packaging is optimized for automated pick-and-place assembly, while Box packaging is suitable for manual or lower-volume assembly processes.

Q: Are both parts suitable for the full -40°C to 85°C operating range?

A: Yes. The AX97-303R3 is rated -40°C to 85°C. The SRR1005-3R3M is rated -40°C to 125°C, which exceeds the minimum requirement. Both parts are suitable for the specified temperature range.

Q: What is the inductance frequency test condition for each part?

A: The AX97-303R3 inductance is measured at 100 kHz. The SRR1005-3R3M inductance is measured at 1 kHz. These different test frequencies may result in slight measurement variations due to frequency-dependent core characteristics, though the nominal 3.3 µH value remains equivalent.