Würth Elektronik 744774027 Equivalent & Substitute Parts

Part Overview

The Würth Elektronik 744774027 is a 2.7 µH unshielded drum core wirewound inductor rated for 4 A continuous current with a maximum DC resistance of 45 mOhm. This surface mount component operates across the industrial temperature range of -40°C to 125°C and is part of the WE-PD2 series. The part is currently active in production and ROHS3 compliant. Substitute parts may be required due to inventory constraints, regional availability, or specific application requirements where alternative electrical characteristics remain within acceptable design tolerances.

Substiute Parts

744774027

Würth ElektronikIn Stock: 1739744774027 Datasheet

Current PartRFQ

SDR0604-2R7ML

Bourns Inc.In Stock: 2077SDR0604-2R7ML Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 744774027 is determined by the following critical parameters:

• Inductance Value: Must be 2.7 µH with ±20% tolerance to maintain circuit performance
• Core Material & Shielding: Ferrite unshielded drum core construction ensures electromagnetic compatibility with the original design
• Operating Temperature: -40°C to 125°C range must be maintained for industrial applications
• Mounting Type: Surface mount configuration required for PCB compatibility
• Package Format: Tape & Reel (TR) packaging for automated assembly processes

The Bourns Inc. SDR0604-2R7ML meets these core substitution criteria. However, variations in current rating, saturation current, and DC resistance represent trade-offs that must be evaluated against specific circuit requirements.

Parameter Comparison

Engineering Selection Recommendations

The Bourns Inc. SDR0604-2R7ML is a qualified substitute for the Würth Elektronik 744774027 based on matching inductance value, core material, operating temperature range, and compliance certifications. Both components are ROHS3 compliant, REACH unaffected, and rated for unlimited moisture sensitivity.

The primary design consideration is the reduced current rating of the substitute part: 2.3 A versus 4 A for the original. Applications requiring continuous current operation above 2.3 A must use the original 744774027. The substitute exhibits higher DC resistance (60 mOhm versus 45 mOhm), resulting in increased power dissipation in high-current applications. Both parts maintain identical operating temperature specifications and inductance tolerance, supporting direct substitution in circuits where current requirements do not exceed 2.3 A.

Frequently Asked Questions (FAQ)

Q: Can the SDR0604-2R7ML replace the 744774027 in all applications?

A: Substitution is valid only when circuit current requirements do not exceed 2.3 A continuous operation. The original part supports 4 A continuous current. Applications exceeding this threshold require the original 744774027.

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

A: The SDR0604-2R7ML exhibits 60 mOhm maximum DC resistance compared to 45 mOhm for the 744774027. This 15 mOhm difference increases resistive losses proportionally with current. At 2.3 A, the additional power dissipation is approximately 79 mW compared to 52 mW for the original part.

Q: Are the physical dimensions compatible?

A: Both parts are surface mount components with similar footprints. The 744774027 measures 5.80mm L × 5.20mm W × 4.85mm H (seated). The SDR0604-2R7ML measures 5.80mm L × 5.80mm W × 4.80mm H (seated). The width difference of 0.60mm may require PCB layout verification for space-constrained designs.

Q: Do both parts meet the same compliance standards?

A: Yes. Both the 744774027 and SDR0604-2R7ML are ROHS3 compliant, REACH unaffected, and classified as MSL 1 (unlimited moisture sensitivity). Both are rated for -40°C to 125°C operation.

Q: What is the saturation current difference between these parts?

A: The 744774027 has a saturation current of 8 A, while the SDR0604-2R7ML saturates at 3.8 A. This represents a significant difference in magnetic core performance. Applications with transient current spikes or fault conditions must account for the lower saturation threshold of the substitute part.