Würth Elektronik 744373680039 Equivalent & Substitute Parts

Part Overview

The Würth Elektronik 744373680039 is a 390 nH shielded molded inductor designed for high-current surface mount applications. This component delivers 20.5 A rated current with 1.3 mOhm maximum DC resistance in a nonstandard package measuring 11.00mm × 10.00mm. The part is active in production and ROHS3 compliant, making it suitable for modern electronic assemblies requiring compact, shielded inductance solutions. Substitute parts may be required due to inventory constraints, regional availability, or design flexibility in applications where electrical parameters remain within acceptable tolerances.

Substiute Parts

744373680039

Würth ElektronikIn Stock: 1749744373680039 Datasheet

Current PartRFQ

PA4342.391NLT

Pulse ElectronicsIn Stock: 5137PA4342.391NLT Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

The Pulse Electronics PA4342.391NLT qualifies as a direct substitute based on the following critical parameters:

• Inductance Match: Both parts specify 390 nH with ±20% tolerance at 100 kHz test frequency
• DC Resistance Equivalence: Both maintain 1.3 mOhm maximum DCR
• Shielding Configuration: Both are shielded molded inductors
• Temperature Range Compatibility: Both operate across -40°C to 125°C
• Surface Mount Compatibility: Both are surface mount components in nonstandard packages
• Compliance Alignment: Both are ROHS3 compliant with REACH unaffected status

The PA4342.391NLT provides higher current rating (30 A versus 20.5 A) and lower saturation current (60 A versus 63 A), making it suitable for applications where the 744373680039 is specified but higher current headroom is beneficial or where inventory availability favors the substitute.

Parameter Comparison

Engineering Selection Recommendations

Both the Würth Elektronik 744373680039 and Pulse Electronics PA4342.391NLT are active production components with identical ROHS3 and REACH compliance certifications. Selection between these parts should be based on:

• Current Margin Requirements: The PA4342.391NLT provides 9.5 A additional current rating headroom, beneficial for designs operating near the 20.5 A limit of the primary part
• PCB Layout Constraints: The PA4342.391NLT is marginally larger (11.50mm × 10.30mm versus 11.00mm × 10.00mm) and 0.10mm shorter in seated height, requiring verification of available board space
• Inventory and Lead Time: Selection may be driven by component availability and supply chain considerations
• Electrical Performance: Identical inductance, tolerance, and DC resistance specifications ensure functional equivalence in circuit operation

Frequently Asked Questions (FAQ)

Q: Can the PA4342.391NLT directly replace the 744373680039 in existing designs?

A: Yes, provided PCB layout accommodates the slightly larger footprint (11.50mm × 10.30mm versus 11.00mm × 10.00mm). Electrical parameters are equivalent, and both components meet identical compliance requirements.

Q: What is the significance of the higher current rating on the PA4342.391NLT?

A: The 30 A rating on the PA4342.391NLT versus 20.5 A on the 744373680039 provides additional thermal and electrical margin. This does not change circuit behavior but offers design flexibility for applications approaching the original part's current limits.

Q: Are there package compatibility concerns between these parts?

A: Both parts use nonstandard surface mount packages. While dimensions differ slightly, both are designed for automated assembly. Verify that your PCB design accommodates the PA4342.391NLT's 11.50mm × 10.30mm footprint and 4.00mm seated height.

Q: Do both parts meet the same environmental and compliance standards?

A: Yes. Both the 744373680039 and PA4342.391NLT are ROHS3 compliant, REACH unaffected, MSL 1 (unlimited), and operate across -40°C to 125°C. Both are suitable for equivalent regulatory environments.

Q: What determines substitution eligibility for 390 nH shielded molded inductors?

A: Substitution eligibility is determined by matching inductance (390 nH ±20%), DC resistance (1.3 mOhm maximum), shielding configuration, operating temperature range, and surface mount compatibility. Current rating may vary provided the substitute meets or exceeds the original specification.