AX97-20331 Equivalent & Substitute Parts Reference

Part Overview

The AX97-20331 is a 330 µH fixed unshielded drum core wirewound inductor manufactured by Triad Magnetics, rated for 300 mA continuous current with a maximum DC resistance of 2Ohm. This surface mount component operates across the temperature range of -40°C to 85°C and is ROHS3 compliant. The part is currently in active production status with 677 pieces available in new original inventory.

Substitute parts are identified when equivalent inductance values, compatible current ratings, and matching core material specifications are available from alternative manufacturers. Substitution becomes necessary when primary part availability is limited, lead times are extended, or design flexibility permits selection from qualified alternatives meeting the same electrical and mechanical requirements.

Substiute Parts

AX97-20331

Triad MagneticsIn Stock: 761AX97-20331 Datasheet

Current PartRFQ

SRR1005-331K

Bourns Inc.In Stock: 1860SRR1005-331K Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the AX97-20331 are qualified based on the following criteria:

Primary Matching Parameters:

• Inductance value: 330 µH (exact match required)
• Core material: Ferrite drum core wirewound construction
• Mounting type: Surface mount (SMD)
• Regulatory compliance: ROHS3 compliant

Allowable Variation Parameters:

• Current rating: Substitute must equal or exceed 300 mA minimum
• DC resistance: Substitute must not exceed 2Ohm maximum
• Shielding: Shielded variants are acceptable for unshielded applications
• Operating temperature: Substitute range must encompass or exceed -40°C to 85°C
• Tolerance: Tighter tolerance specifications are acceptable

The SRR1005-331K from Bourns Inc. qualifies as a direct substitute based on matching inductance (330 µH), ferrite drum core construction, surface mount packaging, and ROHS3 compliance. The substitute provides improved electrical performance through lower DCR (1.2Ohm vs. 2Ohm maximum) and higher current rating (350 mA vs. 300 mA), with extended operating temperature range (-40°C to 125°C).

Parameter Comparison

Engineering Selection Recommendations

Primary Part Selection (AX97-20331): Select the AX97-20331 when design specifications explicitly require unshielded inductor construction and when the standard operating temperature range of -40°C to 85°C is sufficient. This part maintains active production status with established supply availability (677 pieces in stock). ROHS3 compliance and EAR99 export classification are confirmed.

Substitute Part Selection (SRR1005-331K): The SRR1005-331K qualifies as a direct functional substitute when circuit design permits shielded inductor operation. The substitute provides measurable improvements in electrical performance: 50 mA additional current margin and 40% reduction in maximum DC resistance. Extended operating temperature range (-40°C to 125°C) accommodates broader thermal environments. Tighter inductance tolerance (±10% vs. ±20%) reduces circuit parameter variation. ROHS3 compliance and REACH unaffected status match regulatory requirements. Packaging format differs (Tape & Reel vs. Box), requiring verification of assembly process compatibility.

Compliance Verification: Both parts maintain ROHS3 compliance and EAR99 export classification. REACH status is unaffected for both components. No additional regulatory constraints apply to substitution.

Frequently Asked Questions (FAQ)

Q: Can the SRR1005-331K replace the AX97-20331 in all applications?

A: The SRR1005-331K is electrically compatible when circuit design permits shielded inductor operation. The primary difference is shielding: the substitute is shielded while the original is unshielded. Shielded inductors reduce electromagnetic interference emission but may alter circuit impedance characteristics in sensitive RF or high-frequency applications. Verify circuit schematic requirements before substitution.

Q: What is the significance of the lower DC resistance in the substitute part?

A: The SRR1005-331K maximum DCR of 1.2Ohm compared to the AX97-20331 maximum of 2Ohm results in reduced resistive losses during operation. At the rated 300 mA current level, this represents lower power dissipation and reduced thermal generation. This improvement is beneficial in power-sensitive applications but does not affect basic inductance function.

Q: Are there packaging considerations when substituting these parts?

A: Yes. The AX97-20331 is supplied in Box packaging while the SRR1005-331K is supplied in Tape & Reel (TR) format. Tape & Reel packaging is standard for automated assembly processes, while Box packaging is typical for manual or small-volume assembly. Verify that your assembly process and equipment are compatible with the substitute packaging format before ordering.

Q: Does the shielding in the substitute part affect circuit performance?

A: Shielded inductors reduce radiated electromagnetic interference compared to unshielded designs. In circuits where EMI reduction is beneficial, the shielded substitute provides an advantage. In circuits where unshielded operation is specifically required (such as certain tuning or resonant applications), the shielded substitute may not be appropriate. Review circuit design documentation to confirm shielding requirements.

Q: What is the current saturation specification and why is it listed for the substitute but not the main part?

A: Current saturation (Isat) indicates the current level at which inductor core material begins to saturate, causing inductance to degrade. The SRR1005-331K specifies Isat at 480 mA, meaning inductance remains stable below this threshold. The AX97-20331 does not provide this specification in the available data. Both parts operate safely at their rated 300 mA continuous current, well below saturation limits.

Q: Can I use the substitute part if my design operates at the upper temperature limit of 85°C?

A: Yes. The SRR1005-331K operating range of -40°C to 125°C fully encompasses the -40°C to 85°C requirement of the original design. The substitute remains qualified for all temperature conditions specified for the AX97-20331.