1234AS-H-220M=P3 Equivalent & Substitute Parts

Part Overview

The 1234AS-H-220M=P3 is a 22 µH shielded drum core wirewound inductor manufactured by Murata Electronics, rated for 750 mA continuous current with a maximum DC resistance of 444 mOhm. This surface mount component operates across the industrial temperature range of -40°C to 85°C and features ferrite core construction with ±20% inductance tolerance.

This part is classified as obsolete. Identifying equivalent and substitute components is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications utilizing this inductor specification.

Substiute Parts

1234AS-H-220M=P3

Murata ElectronicsIn Stock: 8201234AS-H-220M=P3 Datasheet

Current PartRFQ

7447789122

Würth ElektronikIn Stock: 29887447789122 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute components for the 1234AS-H-220M=P3 must satisfy the following core electrical and mechanical criteria:

Mandatory Matching Parameters:

• Inductance value: 22 µH
• Inductance tolerance: ±20%
• Core material: Ferrite
• Shielding: Shielded
• Mounting type: Surface Mount
• Moisture sensitivity level: MSL 1 or better

Allowable Parameter Variations:

• Current rating: Must equal or exceed 750 mA
• Saturation current (Isat): Must equal or exceed 650 mA
• DC resistance (DCR): Must not exceed 444 mOhm
• Operating temperature range: May extend beyond -40°C to 85°C
• Physical dimensions: May differ within surface mount constraints
• Packaging format: May vary (Tape & Reel acceptable for equivalent function)

The substitute part 7447789122 from Würth Elektronik meets all mandatory electrical parameters while providing improved performance characteristics in current handling and thermal range.

Parameter Comparison

Engineering Selection Recommendations

For Direct Substitution:

The 7447789122 (Würth Elektronik WE-PD Robust series) is qualified as a functional equivalent to the 1234AS-H-220M=P3. This substitute part meets or exceeds all mandatory electrical specifications while providing superior performance margins:

• Current handling capacity increased from 750 mA to 1.38 A
• DC resistance reduced from 444 mOhm to 190 mOhm, resulting in lower power dissipation
• Operating temperature range extended to 125°C, supporting broader thermal environments
• Active product status ensures ongoing availability and supply chain support
• AEC-Q200 automotive qualification provides additional reliability assurance
• ROHS3 compliance and REACH unaffected status confirm environmental regulatory alignment

Physical Footprint Consideration:

The substitute part features larger dimensions (7.30mm x 7.30mm x 4.60mm versus 4.70mm x 4.50mm x 1.40mm). PCB layout verification is required to confirm that the increased footprint accommodates existing design constraints. If space limitations prevent physical substitution, alternative 22 µH inductors matching the original dimensions must be evaluated.

Frequently Asked Questions (FAQ)

Q: Can the 7447789122 be used as a direct replacement for the 1234AS-H-220M=P3?

A: Yes, the 7447789122 meets all mandatory electrical and mechanical criteria for substitution. The inductance value, tolerance, core material, shielding, and mounting type are identical. Current rating, saturation current, and DC resistance all exceed the original specification. Physical dimensions are larger and must be verified against PCB layout constraints.

Q: What are the key differences between these two inductors?

A: The primary differences are current handling capacity (1.38 A versus 750 mA), DC resistance (190 mOhm versus 444 mOhm), operating temperature range (-40°C to 125°C versus -40°C to 85°C), and physical size. The substitute part provides superior electrical performance and thermal range.

Q: Does the larger size of the 7447789122 affect circuit performance?

A: Physical size does not affect electrical performance in this application. However, the larger footprint requires verification that the component fits within existing PCB layout and assembly constraints. If space is limited, alternative suppliers offering 22 µH inductors in the original dimensions must be evaluated.

Q: Are there any compliance or certification differences?

A: The 7447789122 carries AEC-Q200 automotive qualification, ROHS3 compliance, and REACH unaffected status. The original part does not specify these certifications. If your application requires automotive-grade components, the substitute part provides additional qualification assurance.

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

A: Lower DC resistance (190 mOhm versus 444 mOhm) reduces resistive power loss in the inductor. This results in lower heat generation and improved efficiency, particularly in applications with sustained current flow near the rated maximum.

Q: Can I use the 7447789122 in applications requiring the original operating temperature range of -40°C to 85°C?

A: Yes. The substitute part's extended temperature range (-40°C to 125°C) fully encompasses the original specification. No thermal performance degradation occurs within the original operating range.