Würth Elektronik 744045471 Fixed Inductor - Equivalent & Substitute Parts

Part Overview

The Würth Elektronik 744045471 is a 470 µH unshielded drum core wirewound inductor rated for 105 mA continuous current with a maximum DC resistance of 14.2Ohm. This surface mount component is designed for applications requiring stable inductance values in compact form factors. The part is Active status and ROHS3 compliant, making it suitable for modern electronic assemblies. Substitute parts may be required due to inventory constraints, regional availability, or specific application performance requirements.

Substiute Parts

744045471

Würth ElektronikIn Stock: 2161744045471 Datasheet

Current PartRFQ

SDR0403-471KL

Bourns Inc.In Stock: 6110SDR0403-471KL Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the Würth Elektronik 744045471 is determined by the following critical parameters:

• Inductance value: 470 µH (±10% tolerance acceptable)
• Core type: Ferrite drum core, wirewound construction
• Shielding configuration: Unshielded
• Operating temperature range: -40°C ~ 125°C minimum
• Current rating: Must support application requirements
• DC resistance: Lower values improve efficiency; higher values acceptable if within application limits
• Surface mount package compatibility
• RoHS3 compliance and REACH unaffected status

The Bourns Inc. SDR0403-471KL meets these substitution criteria with equivalent inductance, core material, shielding, temperature range, and compliance certifications.

Parameter Comparison

Engineering Selection Recommendations

Both the Würth Elektronik 744045471 and Bourns Inc. SDR0403-471KL are Active status components with ROHS3 compliance and REACH unaffected certification, qualifying them for equivalent use in regulated applications. The Bourns SDR0403-471KL provides superior electrical performance with 130 mA current rating versus 105 mA, higher saturation current of 190 mA, and significantly lower DC resistance of 7Ohm compared to 14.2Ohm. These characteristics make the Bourns part suitable for applications where the Würth component is unavailable or where improved efficiency is beneficial. Both components maintain identical inductance values, tolerance, core material, shielding configuration, and operating temperature range.

Frequently Asked Questions (FAQ)

Q: Can the Bourns SDR0403-471KL directly replace the Würth Elektronik 744045471?

A: Yes. Both components share identical inductance (470 µH), tolerance (±10%), core material (ferrite), shielding (unshielded), operating temperature range (-40°C ~ 125°C), and compliance certifications (ROHS3, REACH unaffected). The Bourns part offers higher current rating and lower DC resistance.

Q: What are the physical package differences?

A: The Würth part uses 1812 (4532 Metric) package with dimensions 4.50mm L x 3.20mm W x 2.90mm H. The Bourns part uses a nonstandard package with dimensions 4.50mm L x 4.00mm W x 4.60mm H. PCB layout verification is required for physical fit.

Q: How do the DC resistance values affect circuit performance?

A: The Bourns SDR0403-471KL has 7Ohm maximum DC resistance compared to 14.2Ohm for the Würth part. Lower DC resistance reduces power dissipation and heat generation in the inductor, improving overall circuit efficiency.

Q: Are both parts suitable for high-temperature applications?

A: Yes. Both components operate across -40°C to 125°C, meeting standard industrial and commercial temperature requirements.

Q: What is the significance of saturation current ratings?

A: Saturation current indicates the maximum current before inductance degrades significantly. The Würth part saturates at 180 mA while the Bourns part saturates at 190 mA. Both exceed their respective continuous current ratings, providing adequate margin for transient conditions.