Würth Elektronik 7440450018 Equivalent & Substitute Parts

Part Overview

The Würth Elektronik 7440450018 is a 1.8 µH unshielded drum core wirewound inductor rated for 1.7 A continuous current with a maximum DC resistance of 100mOhm. This surface mount component is designed for applications requiring fixed inductance in compact 1812 (4532 Metric) package form factor. The part is active in production with ROHS3 compliance and unlimited moisture sensitivity rating. Substitute parts are identified when equivalent inductance values, core materials, and electrical performance parameters align within acceptable tolerances for the intended application.

Substiute Parts

7440450018

Würth ElektronikIn Stock: 143777440450018 Datasheet

Current PartRFQ

SDR0403-1R8ML

Bourns Inc.In Stock: 10386SDR0403-1R8ML Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the Würth Elektronik 7440450018 is determined by the following critical parameters:

• Inductance Value: 1.8 µH with ±20% tolerance
• Core Type: Ferrite drum core, wirewound construction
• Shielding Configuration: Unshielded
• Current Rating: Minimum 1.7 A continuous current capability
• DC Resistance: Performance within acceptable limits for the application
• Operating Temperature: -40°C ~ 125°C range
• Compliance: ROHS3 and REACH requirements
• Mounting Type: Surface mount technology

The Bourns Inc. SDR0403-1R8ML meets these substitution criteria with matching inductance value, ferrite core material, unshielded configuration, and operating temperature range. The substitute part exceeds the current rating requirement with 2.91 A capability and provides lower DC resistance at 42 mOhm maximum.

Parameter Comparison

Engineering Selection Recommendations

Both the Würth Elektronik 7440450018 and Bourns Inc. SDR0403-1R8ML are active production components with ROHS3 compliance and REACH unaffected status. The Bourns substitute provides enhanced electrical performance with higher current rating and lower DC resistance, making it suitable for applications requiring improved thermal performance or higher current headroom. Both components maintain identical inductance values and operating temperature specifications. Selection between these parts should be based on availability, packaging format requirements, and specific application current demands within the -40°C to 125°C operating range.

Frequently Asked Questions (FAQ)

Q: Can the Bourns SDR0403-1R8ML directly replace the Würth Elektronik 7440450018?

A: Yes, the Bourns part meets all critical substitution parameters including inductance value, tolerance, core material, shielding configuration, and operating temperature range. The substitute provides superior current handling and lower DC resistance.

Q: What are the package differences between these parts?

A: The Würth part uses standard 1812 (4532 Metric) packaging. The Bourns part uses a nonstandard package with slightly different dimensions: 4.50mm L x 4.00mm W x 4.60mm H maximum seated height, compared to 4.50mm L x 3.20mm W x 2.90mm H for the Würth component. Physical space constraints must be verified before substitution.

Q: Are there compliance differences between these inductors?

A: Both parts are ROHS3 compliant and REACH unaffected. Moisture sensitivity levels are identical at MSL 1 (Unlimited). No compliance barriers exist for substitution.

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

A: The Bourns substitute has 42 mOhm maximum DCR compared to 100 mOhm maximum for the Würth part. Lower resistance reduces power dissipation and heat generation, beneficial for high-current applications or thermally constrained designs.

Q: What is the saturation current difference and why does it matter?

A: The Bourns part has 4.4 A saturation current versus 4.6 A for the Würth component. Higher saturation current provides greater margin before inductance degradation occurs under peak current conditions.