1234AS-H-3R3M=P3 Equivalent & Substitute Parts

Part Overview

The 1234AS-H-3R3M=P3 is a 3.3 µH shielded drum core wirewound inductor manufactured by Murata Electronics, rated for 1.9 A continuous current with a maximum DC resistance of 96 mOhm. This component is classified as obsolete, making identification of suitable substitute parts essential for ongoing design support and production continuity. The part operates across the industrial temperature range of -40°C to 85°C and is designed for surface mount applications in compact form factors.

Substiute Parts

1234AS-H-3R3M=P3

Murata ElectronicsIn Stock: 6791234AS-H-3R3M=P3 Datasheet

Current PartRFQ

DR73-3R3-R

Eaton - Electronics DivisionIn Stock: 17804DR73-3R3-R Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the obsolete 1234AS-H-3R3M=P3 is determined by strict equivalence in the following electrical and mechanical parameters:

Critical Matching Parameters:

• Inductance value: 3.3 µH at 100 kHz test frequency
• Inductance tolerance: ±20%
• Core type: Ferrite drum core, shielded construction
• Mounting: Surface mount configuration
• Temperature range: Minimum -40°C to 85°C operation

Allowable Variation Parameters:

• Current rating: Substitute must equal or exceed 1.9 A
• DC resistance: Substitute may be lower than 96 mOhm (improved performance)
• Saturation current: Substitute must equal or exceed 1.7 A
• Physical dimensions: May differ if board layout permits
• Packaging format: May differ (Tape & Reel acceptable for production)

The DR73-3R3-R from Eaton Electronics Division qualifies as a direct substitute based on matching inductance, tolerance, core material, shielding, and mounting type, while providing superior electrical performance through higher current ratings and lower DC resistance.

Parameter Comparison

Engineering Selection Recommendations

The DR73-3R3-R is a qualified substitute for the obsolete 1234AS-H-3R3M=P3 based on the following engineering criteria:

Electrical Compatibility: Both parts maintain identical inductance values and tolerances at the specified 100 kHz test frequency. The substitute provides superior electrical performance with 74% higher current rating (3.31 A vs. 1.9 A) and 73% lower DC resistance (25.9 mOhm vs. 96 mOhm), resulting in reduced power dissipation and improved thermal performance in the application.

Mechanical Compatibility: Both parts are shielded ferrite drum core inductors in surface mount configuration. Physical dimensions differ (DR73-3R3-R is larger at 7.60mm × 7.60mm × 4.65mm versus 4.70mm × 4.50mm × 1.40mm), requiring verification of available board space.

Environmental & Compliance: The DR73-3R3-R extends the operating temperature range to -40°C to 125°C, providing broader environmental coverage. Both parts maintain MSL 1 rating. The substitute carries RoHS3 compliance and REACH unaffected status, meeting modern regulatory requirements.

Supply & Production: The DR73-3R3-R is actively manufactured with substantial inventory availability (17,785 pcs), ensuring long-term supply continuity compared to the obsolete original part.

Frequently Asked Questions (FAQ)

Q: Can the DR73-3R3-R directly replace the 1234AS-H-3R3M=P3 in existing designs?

A: Electrical substitution is valid. The DR73-3R3-R matches all critical electrical parameters (inductance, tolerance, core type, shielding) and exceeds performance specifications. Physical board layout must be verified due to larger package dimensions (7.60mm × 7.60mm vs. 4.70mm × 4.50mm).

Q: What are the key differences between these parts?

A: The substitute provides superior performance: 74% higher current rating, 73% lower DC resistance, and extended temperature range to 125°C. The trade-off is increased physical size. Both maintain identical inductance values and tolerance specifications.

Q: Is the higher current rating of the DR73-3R3-R a concern for this application?

A: No. Higher current rating indicates improved thermal and electrical performance margins. The part will operate safely at the original design current of 1.9 A with reduced power dissipation due to lower DC resistance.

Q: Are there packaging format differences?

A: The original part uses standard packaging, while the DR73-3R3-R is supplied in Tape & Reel format. This is standard for production environments and does not affect component functionality.

Q: What is the temperature range consideration?

A: The original part operates to 85°C maximum. The substitute extends this to 125°C, providing additional thermal margin. If the application operates below 85°C, both parts are equivalent in this parameter.

Q: Are there any compliance or regulatory differences?

A: The DR73-3R3-R carries RoHS3 compliance and REACH unaffected status, meeting current regulatory standards. Both parts maintain MSL 1 moisture sensitivity rating.