Würth Elektronik 744303012 Equivalent & Substitute Parts

Part Overview

The Würth Elektronik 744303012 is a 120 nH shielded drum core wirewound inductor rated for 31 A continuous current with a DC resistance of 0.325 mOhm. This component is part of the WE-HCM series and is designed for high-current, low-inductance applications requiring electromagnetic shielding. The part is currently active in production with ROHS3 compliance and unlimited moisture sensitivity rating. Substitute parts are identified when equivalent electrical performance and mechanical compatibility are required due to inventory constraints, supply chain considerations, or design flexibility needs.

Substiute Parts

744303012

Würth ElektronikIn Stock: 840744303012 Datasheet

Current PartRFQ

PA0511.101NL

Pulse ElectronicsIn Stock: 4044PA0511.101NL Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

The Pulse Electronics PA0511.101NL qualifies as a direct substitute for the Würth Elektronik 744303012 based on the following critical parameters:

• Inductance Match: Both parts specify 120 nH with ±20% tolerance
• Current Rating Match: Both rated for 31 A continuous current
• Shielding: Both feature shielded construction
• Mounting: Both are surface mount components
• Compliance: Both are ROHS3 compliant with unlimited moisture sensitivity (MSL 1)
• Temperature Range: Substitute operates at -40°C to 130°C, exceeding the original specification of -40°C to 125°C
• DC Resistance: Substitute DCR of 0.39 mOhm is within acceptable tolerance for this application class

The primary distinction is the DC resistance specification, where the substitute exhibits a slightly higher value (0.39 mOhm versus 0.325 mOhm). This difference of 0.065 mOhm represents approximately 20% variance and remains within typical design margins for high-current inductor applications.

Parameter Comparison

Engineering Selection Recommendations

Both the Würth Elektronik 744303012 and Pulse Electronics PA0511.101NL meet the core electrical requirements for 120 nH, 31 A shielded inductor applications. Selection between these components should be based on the following factors:

Würth Elektronik 744303012 is the primary specification when lower DC resistance is a critical design parameter, particularly in applications where power dissipation must be minimized. The lower saturation current (59.8 A) provides additional margin above the 31 A rating.

Pulse Electronics PA0511.101NL is suitable as a substitute when inventory availability or supply chain optimization is required. The slightly elevated DC resistance (0.39 mOhm) and lower saturation current (52 A) remain within acceptable operating margins for standard high-current inductor applications. The extended temperature range to 130°C provides additional thermal headroom.

Both components carry ROHS3 compliance and unlimited moisture sensitivity rating, ensuring compatibility with standard manufacturing and storage protocols. Physical dimensions are nearly identical, with the substitute measuring 0.2mm longer and 0.04mm shorter in height, which is negligible for standard PCB layout considerations.

Frequently Asked Questions (FAQ)

Q: Can the Pulse Electronics PA0511.101NL be used as a direct replacement for the Würth Elektronik 744303012?

A: Yes. Both components share identical inductance (120 nH), current rating (31 A), tolerance (±20%), shielding, and mounting type. The DC resistance difference of 0.065 mOhm is within acceptable design margins for this application class.

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

A: The Pulse Electronics substitute exhibits 0.39 mOhm compared to the original 0.325 mOhm. This represents approximately 20% higher resistance. In high-current applications, this translates to proportionally higher power dissipation. Thermal analysis should confirm acceptability for your specific circuit design.

Q: Are there any temperature range considerations when substituting?

A: The Pulse Electronics PA0511.101NL operates to 130°C, exceeding the Würth Elektronik specification of 125°C. This provides additional thermal margin and is not a limiting factor for substitution.

Q: How do the saturation current ratings compare?

A: The Würth Elektronik 744303012 specifies 59.8 A saturation current, while the Pulse Electronics PA0511.101NL specifies 52 A. Both exceed the 31 A continuous rating. The Würth part provides 7.8 A additional saturation margin. For applications requiring maximum transient current headroom, the original specification is preferred.

Q: Are the physical dimensions compatible for PCB layout?

A: Dimensions are nearly identical. The Pulse Electronics part measures 10.20mm length (0.2mm longer) and 4.96mm height (0.04mm shorter). These differences are negligible for standard PCB design and do not require layout modifications.

Q: Do both parts meet compliance requirements?

A: Yes. Both components are ROHS3 compliant, REACH unaffected, and carry unlimited moisture sensitivity (MSL 1). Both are classified under ECCN EAR99 and HTSUS 8504.50.8000.