AISM-1812H-331M Equivalent & Substitute Parts

Part Overview

The AISM-1812H-331M is a 330 µH shielded wirewound surface mount inductor manufactured by Abracon LLC in the 1812 (4532 Metric) package. This component is rated for 90 mA continuous current with a maximum DC resistance of 13 Ohm and operates across the temperature range of -40°C to 125°C. The part is currently classified as obsolete, necessitating identification of active equivalent components to maintain design continuity and ensure supply chain availability for new production and repair applications.

Substiute Parts

AISM-1812H-331M

Abracon LLCIn Stock: 1188AISM-1812H-331M Datasheet

Current PartRFQ

AISM-1812H-331K

Abracon LLCIn Stock: 856AISM-1812H-331K Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the AISM-1812H-331M is determined by strict equivalence across the following critical parameters:

• Inductance Value: 330 µH (exact match required)
• Package Footprint: 1812 (4532 Metric) surface mount configuration
• Current Rating: 90 mA minimum continuous current capability
• DC Resistance: 13 Ohm maximum
• Shielding Type: Shielded construction
• Operating Temperature Range: -40°C to 125°C minimum
• Frequency Characteristics: Q factor and self-resonant frequency performance

The AISM-1812H-331K qualifies as a direct substitute based on matching all electrical specifications and mechanical dimensions. The primary distinction is the tolerance specification and active product status.

Parameter Comparison

Engineering Selection Recommendations

The AISM-1812H-331K is the direct equivalent substitute for the obsolete AISM-1812H-331M. Both components are manufactured by Abracon LLC within the same AISM-1812H series and maintain identical electrical performance specifications and mechanical dimensions.

Key Selection Factors:

• Product Status: The AISM-1812H-331K is actively manufactured and stocked, whereas the AISM-1812H-331M is obsolete. Selection of the active part ensures long-term supply chain availability.

• Tolerance Improvement: The substitute part features ±10% inductance tolerance compared to ±20% for the main part, providing tighter inductance control without requiring circuit redesign.

• Compliance Equivalence: Both parts maintain ROHS3 compliance, REACH unaffected status, and MSL 1 moisture sensitivity rating, ensuring regulatory and environmental compatibility.

• Electrical Performance: Identical inductance value, current rating, DC resistance, Q factor, and self-resonant frequency characteristics confirm functional interchangeability in all circuit applications.

• Mechanical Compatibility: Identical package dimensions and height specifications ensure direct PCB footprint compatibility without layout modifications.

Frequently Asked Questions (FAQ)

Q: Can the AISM-1812H-331K be used as a direct replacement for the AISM-1812H-331M in existing designs?

A: Yes. The AISM-1812H-331K is electrically and mechanically equivalent to the AISM-1812H-331M. Both components share identical inductance values, current ratings, DC resistance specifications, and 1812 package dimensions. The substitute part can be used without circuit modifications.

Q: What is the difference between the ±20% tolerance of the main part and the ±10% tolerance of the substitute?

A: The AISM-1812H-331K provides tighter inductance tolerance (±10%) compared to the AISM-1812H-331M (±20%). This means the substitute part maintains inductance values closer to the nominal 330 µH specification. For applications requiring precise inductance control, the substitute part offers improved performance. For applications tolerant of wider inductance variation, both parts are functionally equivalent.

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

A: Yes. Both the AISM-1812H-331M and AISM-1812H-331K are packaged in the 1812 (4532 Metric) case with identical length (0.165" / 4.20mm), width (0.126" / 3.20mm), and maximum seated height (0.134" / 3.40mm). PCB footprints and assembly processes require no modification.

Q: Why is the main part listed as obsolete?

A: The AISM-1812H-331M is classified as obsolete by the manufacturer. The AISM-1812H-331K represents the current active production equivalent within the same series, ensuring continued availability and supply chain support.

Q: Do both parts meet the same regulatory and environmental standards?

A: Yes. Both the AISM-1812H-331M and AISM-1812H-331K are ROHS3 compliant, REACH unaffected, and carry MSL 1 (unlimited) moisture sensitivity ratings. They meet identical regulatory and environmental requirements.

Q: What is the operating temperature range for both parts?

A: Both components operate across the identical temperature range of -40°C to 125°C, ensuring thermal performance equivalence across all specified operating conditions.

Q: Are there any frequency-dependent performance differences?

A: No. Both parts maintain identical Q factor specifications (20 @ 796 kHz) and self-resonant frequency (4 MHz), confirming equivalent high-frequency performance characteristics.