Würth Elektronik 744774047 Equivalent & Substitute Parts

Part Overview

The Würth Elektronik 744774047 is a 4.7 µH unshielded drum core wirewound inductor rated for 3 A continuous current with a maximum DC resistance of 71 mOhm. This component is part of the WE-PD2 series and is actively manufactured. Alternative parts become necessary when primary inventory is unavailable, when application-specific current or resistance requirements differ, or when supply chain optimization is required across multiple manufacturers.

Substiute Parts

744774047

Würth ElektronikIn Stock: 5650744774047 Datasheet

Current PartRFQ

SDR0604-4R7ML

Bourns Inc.In Stock: 8112SDR0604-4R7ML Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 744774047 is determined by the following critical parameters:

• Inductance Value: Must be 4.7 µH with ±20% tolerance
• Core Type: Ferrite drum core, unshielded construction
• Mounting: Surface mount, tape & reel packaging
• Operating Temperature: -40°C to 125°C range
• Compliance: ROHS3 and REACH requirements

The Bourns SDR0604-4R7ML meets these core substitution criteria. However, the substitute part has a reduced current rating (1.8 A versus 3 A) and higher DC resistance (80 mOhm versus 71 mOhm maximum). These differences must be evaluated against specific application requirements.

Parameter Comparison

Engineering Selection Recommendations

Selection between the 744774047 and SDR0604-4R7ML depends on application current requirements:

• Use 744774047 when continuous current demand reaches or exceeds 1.8 A, or when saturation current must exceed 3 A. The lower DC resistance (71 mOhm) reduces power dissipation in high-current applications.

• Use SDR0604-4R7ML when application current remains below 1.8 A continuous. Both parts maintain identical inductance, tolerance, temperature range, and compliance certifications (ROHS3, REACH Unaffected).

Both components are active products with established supply chains. Selection should be based on circuit current specifications and thermal management requirements.

Frequently Asked Questions (FAQ)

Q: Can SDR0604-4R7ML replace 744774047 in all applications?

A: No. The SDR0604-4R7ML has a maximum continuous current rating of 1.8 A compared to 3 A for the 744774047. Substitution is valid only when application current remains below 1.8 A. Exceeding this rating will cause premature saturation and inductor failure.

Q: Are the physical dimensions compatible?

A: Both parts use surface mount packaging with tape & reel delivery. The 744774047 measures 5.80mm L × 5.20mm W × 4.85mm H (seated). The SDR0604-4R7ML measures 5.80mm L × 5.80mm W × 4.80mm H (seated). Width differs by 0.60mm. PCB layout must accommodate the SDR0604-4R7ML's larger footprint.

Q: Do both parts meet compliance requirements?

A: Yes. Both the 744774047 and SDR0604-4R7ML are ROHS3 compliant and REACH unaffected, meeting current regulatory standards for electronic components.

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

A: The SDR0604-4R7ML has 80 mOhm maximum DC resistance versus 71 mOhm for the 744774047. At 1.8 A, this represents approximately 9 mW additional power dissipation. This difference is negligible in most applications but should be evaluated in thermally constrained designs.

Q: Are the inductance values and tolerances identical?

A: Yes. Both parts provide 4.7 µH inductance with ±20% tolerance, measured at their respective test frequencies (10 kHz for 744774047, 1 kHz for SDR0604-4R7ML). This ensures functional equivalence in inductance-dependent circuit behavior.