AISC-1812H-122K-T Equivalent & Substitute Parts

Part Overview

The AISC-1812H-122K-T is a 1.2 mH unshielded drum core wirewound inductor manufactured by Abracon LLC in a 1812 (4532 Metric) surface mount package. Designed for 45 mA applications with a maximum DC resistance of 48Ohm, this component operates across -25°C to 85°C. The part is currently obsolete, necessitating identification of functionally equivalent alternatives that maintain electrical and mechanical compatibility for ongoing production and repair applications.

Substiute Parts

AISC-1812H-122K-T

Abracon LLCIn Stock: 891AISC-1812H-122K-T Datasheet

Current PartRFQ

LQH43NN122J03L

Murata ElectronicsIn Stock: 944LQH43NN122J03L Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the AISC-1812H-122K-T is determined by strict alignment of the following parameters:

• Inductance value: 1.2 mH (exact match required)
• Current rating: 45 mA (minimum threshold)
• Package / Case: 1812 (4532 Metric) (physical and electrical compatibility)
• Core type: Ferrite, unshielded drum core (functional equivalence)
• Mounting type: Surface Mount (assembly compatibility)
• Self-resonant frequency: 1.8 MHz (electrical performance envelope)
• RoHS3 compliance (regulatory requirement)

The LQH43NN122J03L from Murata Electronics satisfies all substitution criteria. While DC resistance differs (30Ohm Max versus 48Ohm Max), this represents an improvement in electrical performance and does not compromise circuit functionality. The tighter inductance tolerance (±5% versus ±10%) and extended operating temperature range (-40°C ~ 105°C versus -25°C ~ 85°C) provide additional design margin.

Parameter Comparison

Engineering Selection Recommendations

The LQH43NN122J03L is the qualified substitute for AISC-1812H-122K-T applications. Both components maintain ROHS3 compliance and REACH unaffected status, satisfying regulatory requirements for new designs and legacy system repairs.

The Murata part offers superior electrical characteristics: reduced DC resistance (30Ohm Max) decreases power dissipation and improves efficiency compared to the original 48Ohm specification. The tighter inductance tolerance (±5%) enhances circuit performance predictability. Extended operating temperature range (-40°C ~ 105°C) accommodates broader environmental conditions than the original -25°C ~ 85°C specification.

Physical compatibility is confirmed: identical 1812 (4532 Metric) package dimensions, height, and surface mount configuration ensure direct PCB footprint compatibility without layout modification.

Frequently Asked Questions (FAQ)

Q: Can LQH43NN122J03L be used as a direct replacement for AISC-1812H-122K-T?

A: Yes. Both components share identical inductance (1.2 mH), current rating (45 mA), package dimensions (1812 / 4532 Metric), and self-resonant frequency (1.8 MHz). Physical footprint and electrical performance are compatible for direct substitution.

Q: How does the lower DC resistance of the Murata part affect circuit operation?

A: The LQH43NN122J03L exhibits 30Ohm Max DC resistance compared to 48Ohm Max for the original part. Lower resistance reduces power dissipation and heat generation, improving overall circuit efficiency. This represents an electrical improvement and does not compromise functionality.

Q: Are there packaging differences between these parts?

A: No. Both components use identical 1812 (4532 Metric) surface mount packages with matching dimensions (0.177" L x 0.126" W / 4.50mm x 3.20mm) and maximum seated height (0.110" / 2.80mm). PCB assembly processes require no modification.

Q: Do both parts meet current regulatory requirements?

A: Yes. Both AISC-1812H-122K-T and LQH43NN122J03L are ROHS3 compliant and REACH unaffected, satisfying current environmental and hazardous substance regulations.

Q: What is the inductance tolerance difference, and does it matter?

A: The Murata part specifies ±5% tolerance versus ±10% for the Abracon original. Tighter tolerance improves circuit performance consistency and reduces design margin requirements. This is advantageous for precision applications.

Q: Can the extended operating temperature range of the Murata part cause compatibility issues?

A: No. The LQH43NN122J03L operating range (-40°C ~ 105°C) encompasses the original specification (-25°C ~ 85°C). Extended range provides additional design flexibility without introducing incompatibility.