1234AS-H-120M=P3 Equivalent & Substitute Parts

Part Overview

The 1234AS-H-120M=P3 is a 12 µH shielded drum core wirewound inductor manufactured by Murata Electronics, rated for 1.1 A continuous current with a maximum DC resistance of 228mOhm. This surface mount component operates across the temperature range of -40°C to 85°C and is designed for applications requiring fixed inductance in compact form factors.

The product status is obsolete, necessitating identification of functionally equivalent alternatives for ongoing design support and procurement continuity.

Substiute Parts

1234AS-H-120M=P3

Murata ElectronicsIn Stock: 9591234AS-H-120M=P3 Datasheet

Current PartRFQ

744043120

Würth ElektronikIn Stock: 10870744043120 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 1234AS-H-120M=P3 is determined by the following critical parameters:

• Inductance Value: Must be 12 µH (matched specification)
• Current Rating: Must meet or exceed 1.1 A continuous rating
• Shielding: Must be shielded to maintain electromagnetic isolation
• Core Material: Ferrite drum core construction
• Mounting Type: Surface mount configuration
• Operating Temperature Range: Must support minimum -40°C to 85°C operation
• Inductance Test Frequency: 100 kHz measurement standard

The substitute part 744043120 (Würth Elektronik WE-TPC series) satisfies all substitution criteria with equivalent inductance, higher current rating (1.12 A), lower DC resistance (125mOhm), and extended temperature range (-40°C to 125°C).

Parameter Comparison

Engineering Selection Recommendations

The 744043120 (Würth Elektronik WE-TPC series) is the qualified substitute for the obsolete 1234AS-H-120M=P3. Selection is based on the following factors:

• Product Status: The substitute is active and in production, ensuring long-term availability and supply chain continuity.
• Electrical Equivalence: Inductance value matches at 12 µH with equivalent test frequency (100 kHz). Current rating exceeds the original specification (1.12 A vs. 1.1 A).
• Performance Improvement: DC resistance is significantly lower (125mOhm vs. 228mOhm), resulting in reduced power dissipation and improved thermal performance.
• Compliance: The substitute carries RoHS3 compliance and REACH unaffected status, meeting current regulatory requirements.
• Temperature Range: Extended operating range (-40°C to 125°C) provides additional thermal margin beyond the original specification.

Frequently Asked Questions (FAQ)

Q: Can the 744043120 be used as a direct replacement for the 1234AS-H-120M=P3?

A: Yes. Both components share identical inductance values (12 µH), equivalent current ratings (1.12 A vs. 1.1 A), matching core material (ferrite), shielding configuration, and surface mount packaging. The substitute meets all electrical and mechanical substitution criteria.

Q: What are the physical dimension differences between these parts?

A: The 1234AS-H-120M=P3 measures 0.185" L x 0.177" W x 0.055" H (4.70mm x 4.50mm x 1.40mm). The 744043120 measures 0.189" L x 0.189" W x 0.118" H (4.80mm x 4.80mm x 3.00mm). The substitute is slightly larger in footprint and significantly taller. PCB layout verification is required before implementation.

Q: How does the inductance tolerance difference affect circuit performance?

A: The original part specifies ±20% tolerance while the substitute specifies ±30%. Both tolerances are measured at 100 kHz. Circuit designs must accommodate the wider tolerance range of the substitute part, or component selection and matching procedures must be implemented if tighter tolerance control is required.

Q: Is the lower DC resistance of the substitute part beneficial?

A: Yes. The 744043120 exhibits 125mOhm maximum DC resistance compared to 228mOhm for the original part. Lower DC resistance reduces I²R power dissipation, improves efficiency, and decreases thermal generation during operation.

Q: What packaging format is the substitute supplied in?

A: The 744043120 is supplied in Tape & Reel (TR) format, standard for high-volume surface mount assembly. The original part packaging format is nonstandard. Confirm tape specifications and reel compatibility with your assembly equipment.

Q: Are there any compliance or certification differences?

A: The substitute (744043120) is RoHS3 compliant and REACH unaffected. The original part (1234AS-H-120M=P3) does not specify these certifications. Both parts carry EAR99 ECCN classification. Verify compliance requirements for your specific application and regulatory jurisdiction.