74437321015 Equivalent & Substitute Parts

Part Overview

The Würth Elektronik 74437321015 is a 1.5 µH shielded molded inductor rated for 3 A continuous current with a maximum DC resistance of 63.3 mOhm. This component is part of the WE-LHMI series and is actively manufactured. Equivalent parts are identified when they maintain the same inductance value, current rating tolerance, shielding characteristics, and surface mount package compatibility while meeting the same operating temperature and compliance requirements.

Substiute Parts

74437321015

Würth ElektronikIn Stock: 683574437321015 Datasheet

Current PartRFQ

MPI4012V2-1R5-R

Eaton - Electronics DivisionIn Stock: 1122MPI4012V2-1R5-R Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 74437321015 is based on the following critical parameters:

• Inductance Value: Must be 1.5 µH with ±20% tolerance
• Current Rating: Minimum 3 A continuous current capability
• DC Resistance: Must not exceed 63.3 mOhm to maintain equivalent performance
• Shielding: Must be shielded to prevent electromagnetic interference
• Surface Mount Package: Must be compatible with 2-SMD or equivalent surface mount footprint
• Operating Temperature: Must support -40°C to 125°C range
• Compliance: Must meet RoHS requirements

The substitute part MPI4012V2-1R5-R from Eaton - Electronics Division meets these criteria with equivalent electrical performance and mechanical compatibility.

Parameter Comparison

Engineering Selection Recommendations

The MPI4012V2-1R5-R is a direct electrical equivalent to the 74437321015. Both components are actively manufactured and meet RoHS compliance requirements. The substitute part offers a higher current rating (3.3 A versus 3 A) and an extended lower operating temperature limit (-55°C versus -40°C), providing additional design margin in both thermal and current capacity scenarios. DC resistance remains within acceptable tolerance (66 mOhm versus 63.3 mOhm maximum). Physical dimensions are nearly identical with a minor width variation of 0.009" (0.29mm), which is negligible for standard PCB layouts. Both components maintain MSL Level 1 moisture sensitivity classification.

Frequently Asked Questions (FAQ)

Q: Can the MPI4012V2-1R5-R be used as a direct replacement for the 74437321015?

A: Yes. Both components share the same inductance value (1.5 µH), tolerance (±20%), shielding type, surface mount configuration, and operating temperature range. The substitute part meets or exceeds all critical electrical parameters.

Q: What is the difference in DC resistance between these parts?

A: The 74437321015 has a maximum DC resistance of 63.3 mOhm, while the MPI4012V2-1R5-R has a maximum of 66 mOhm. This 2.7 mOhm difference represents approximately 4.3% variation and remains within acceptable engineering tolerance for most applications.

Q: Are there physical footprint compatibility concerns?

A: Both parts are surface mount components with identical height (0.047" / 1.20mm). The width difference is 0.009" (0.29mm), which does not affect standard PCB footprint compatibility for 2-SMD packages.

Q: Do both parts meet the same compliance standards?

A: Both components are RoHS compliant and carry MSL Level 1 moisture sensitivity classification. The 74437321015 is ROHS3 compliant, while the MPI4012V2-1R5-R is RoHS compliant. Both meet current regulatory requirements.

Q: What is the saturation current difference?

A: The 74437321015 has a saturation current (Isat) of 4.4 A, while the MPI4012V2-1R5-R has 4.3 A. Both values provide adequate margin above the 3 A continuous current rating.