AISC-1210H-121K-T Equivalent & Substitute Parts

Part Overview

The AISC-1210H-121K-T is a 120 µH unshielded drum core wirewound inductor manufactured by Abracon LLC, rated for 160 mA continuous current with a maximum DC resistance of 7.47Ohm. This component is designed for surface mount applications in the 1210 (3225 Metric) package format. The part is currently listed as obsolete, making identification of suitable substitute components essential for ongoing production and design requirements. Equivalent parts must maintain the same inductance value, package dimensions, and core material while accommodating variations in current ratings and DC resistance within acceptable engineering tolerances.

Substiute Parts

AISC-1210H-121K-T

Abracon LLCIn Stock: 1119AISC-1210H-121K-T Datasheet

Current PartRFQ

744032121

Würth ElektronikIn Stock: 5009744032121 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the AISC-1210H-121K-T is determined by the following critical parameters:

Primary Matching Criteria:

• Inductance value: 120 µH ±10%
• Package / Case: 1210 (3225 Metric)
• Core material: Ferrite
• Shielding configuration: Unshielded
• Mounting type: Surface Mount

Secondary Compatibility Factors:

• DC Resistance: Must not exceed 7.47Ohm maximum
• Current Rating: Must support minimum 160 mA continuous operation
• Operating Temperature: Must cover at least the -25°C ~ 85°C range
• Regulatory Compliance: ROHS3 compliance required

The substitute part 744032121 (Würth Elektronik WE-LQ series) meets all primary matching criteria with identical inductance, package dimensions, core material, and mounting configuration. Secondary parameters show acceptable variation within engineering tolerances for this component category.

Parameter Comparison

Engineering Selection Recommendations

The 744032121 (Würth Elektronik WE-LQ series) is qualified as a direct substitute for the obsolete AISC-1210H-121K-T based on the following engineering criteria:

Compliance & Regulatory Status: Both components maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory continuity in production environments.

Physical & Electrical Compatibility: Identical inductance value (120 µH), package dimensions (1210 / 3225 Metric), core material (ferrite), and mounting configuration enable direct PCB-level substitution without layout modifications.

Current Rating Consideration: The substitute part is rated for 95 mA continuous current, which is lower than the original 160 mA specification. Circuit designs operating at or below 95 mA continuous current are fully compatible. Designs requiring the full 160 mA rating require alternative evaluation.

DC Resistance: The substitute exhibits lower DC resistance (7Ohm max vs. 7.47Ohm max), which is advantageous for power efficiency and thermal performance.

Temperature Operating Range: The substitute supports an extended temperature range (-40°C ~ 125°C), providing broader environmental compatibility compared to the original specification.

Product Availability: The substitute part is in active production status with confirmed inventory availability, ensuring supply chain continuity.

Frequently Asked Questions (FAQ)

Q: Can the 744032121 be used as a direct replacement in all applications using AISC-1210H-121K-T?

A: Direct substitution is valid for applications where the continuous current requirement does not exceed 95 mA. If your circuit design requires the full 160 mA rating of the original part, the 744032121 is not suitable without circuit redesign or alternative component selection.

Q: Are the physical dimensions identical between these two parts?

A: The package designation is identical (1210 / 3225 Metric), but minor dimensional variations exist. The main part measures 0.138" L x 0.098" W (4.60mm x 2.50mm) with 0.098" height, while the substitute measures 0.126" L x 0.098" W (3.20mm x 2.50mm) with 0.091" height. These differences are within standard PCB footprint tolerances for 1210 packages.

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

A: Lower DC resistance (7Ohm vs. 7.47Ohm) reduces resistive losses and heat generation during operation, improving overall circuit efficiency. This is a beneficial characteristic for power-sensitive applications.

Q: Does the substitute part support the same operating temperature range?

A: No. The substitute supports -40°C ~ 125°C, which exceeds the original -25°C ~ 85°C range. This provides additional environmental margin for applications operating at temperature extremes.

Q: Are both parts RoHS compliant?

A: Yes. Both AISC-1210H-121K-T and 744032121 are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating, ensuring compatibility with standard manufacturing and storage protocols.

Q: What is the primary limitation of using the 744032121 as a substitute?

A: The primary limitation is the reduced current rating (95 mA vs. 160 mA). Applications requiring continuous current operation above 95 mA must evaluate alternative components or implement circuit modifications to reduce current demand.