AISC-1812H-331K-T Equivalent & Substitute Parts

Part Overview

The AISC-1812H-331K-T is a 330 µH unshielded drum core wirewound inductor manufactured by Abracon LLC, rated for 100 mA with a maximum DC resistance of 7.75Ohm. This component is designed for surface mount applications in the 1812 (4532 Metric) package format. The part is currently listed as obsolete, making identification of functionally equivalent alternatives essential for ongoing design support and production continuity.

Substiute Parts

AISC-1812H-331K-T

Abracon LLCIn Stock: 990AISC-1812H-331K-T Datasheet

Current PartRFQ

LQH43CN331K03L

Murata ElectronicsIn Stock: 2251LQH43CN331K03L Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the AISC-1812H-331K-T is determined by strict alignment of the following electrical and mechanical parameters:

• Inductance Value: 330 µH with ±10% tolerance
• Current Rating: 100 mA minimum
• Package Format: 1812 (4532 Metric) surface mount
• Core Material: Ferrite, unshielded drum core construction
• DC Resistance: Must not exceed the application's tolerance for losses
• Operating Temperature: Must support the required thermal range
• Compliance: ROHS3 and REACH status alignment

The substitute part LQH43CN331K03L from Murata Electronics meets these core substitution criteria. Both parts share identical inductance, tolerance, current rating, package dimensions, and core type. The primary distinction lies in DC resistance specification and operating temperature range, which must be evaluated against specific application requirements.

Parameter Comparison

Engineering Selection Recommendations

The LQH43CN331K03L from Murata Electronics is a direct functional equivalent for the obsolete AISC-1812H-331K-T. Both components are ROHS3 compliant and REACH unaffected, meeting current regulatory requirements.

The Murata substitute offers a lower maximum DC resistance specification (6.8Ohm versus 7.75Ohm), which provides improved efficiency characteristics and reduced power dissipation in the application circuit. The extended lower operating temperature limit (-40°C versus -25°C) provides broader thermal coverage for demanding environments.

Selection between these parts should be based on application-specific requirements for DC resistance tolerance and operating temperature range. The Murata part is currently listed as discontinued at DiGi Electronics, requiring verification of availability through alternative distribution channels before design implementation.

Frequently Asked Questions (FAQ)

Q: Can the LQH43CN331K03L directly replace the AISC-1812H-331K-T without circuit modification?

A: Yes, for applications where the operating temperature range of -25°C to 85°C is sufficient and the lower DC resistance of 6.8Ohm is acceptable. Both parts share identical inductance, tolerance, current rating, package dimensions, and self-resonant frequency. Circuit validation is required if the application operates below -25°C or if the original design relied on the higher DC resistance specification.

Q: What is the impact of the different DC resistance values?

A: The Murata substitute has a maximum DC resistance of 6.8Ohm compared to 7.75Ohm for the Abracon part. Lower DC resistance reduces I²R losses and heat generation in the inductor. Applications sensitive to power dissipation or thermal performance will benefit from the lower resistance value. Applications with tight tolerance requirements on inductor losses should account for this 0.95Ohm difference.

Q: Are both parts suitable for high-frequency applications?

A: Both parts have a self-resonant frequency of 3.6 MHz, establishing the upper frequency limit for linear operation. Applications operating near or above this frequency require careful circuit analysis to account for parasitic capacitance effects.

Q: What are the packaging and handling considerations?

A: Both parts are supplied in 1812 (4532 Metric) surface mount packages with identical physical dimensions (0.177" L x 0.126" W, 4.50mm x 3.20mm) and maximum seated height of 0.110" (2.80mm). Both have MSL rating of 1 (Unlimited), requiring standard moisture control during storage and handling. Standard SMD assembly processes are compatible with both components.

Q: How do the product status differences affect selection?

A: The AISC-1812H-331K-T is listed as obsolete, while the LQH43CN331K03L is discontinued at DiGi Electronics. Availability through secondary distribution channels should be confirmed before committing to either part for new production. Long-term supply chain planning is necessary for either selection.