Würth Elektronik 744045008 Equivalent & Substitute Parts

Part Overview

The Würth Elektronik 744045008 is a fixed unshielded drum core wirewound inductor rated at 8.2 µH with 1 A current capacity and 250 mOhm maximum DC resistance. This component is designed for surface mount applications in the 1812 (4532 Metric) package format. The part is currently active in production with full RoHS3 compliance and unlimited moisture sensitivity rating. Substitute parts are identified when equivalent electrical performance and mechanical compatibility can be maintained within the specified parameter tolerances for this inductor category.

Substiute Parts

744045008

Würth ElektronikIn Stock: 2342744045008 Datasheet

Current PartRFQ

SDR0403-8R2ML

Bourns Inc.In Stock: 5158SDR0403-8R2ML Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 744045008 is determined by the following critical parameters:

Inductance value must match at 8.2 µH with ±20% tolerance. Core material must be ferrite with unshielded drum core construction. Current rating must meet or exceed 1 A minimum. DC resistance must not exceed 250 mOhm maximum to ensure equivalent power dissipation characteristics. Operating temperature range must encompass -40°C to 125°C. RoHS3 compliance and MSL 1 rating are required for regulatory and environmental compatibility.

The Bourns SDR0403-8R2ML meets these substitution criteria with matching inductance, core type, temperature range, and compliance certifications. The substitute part provides superior current rating (1.26 A vs 1 A) and lower DC resistance (130 mOhm vs 250 mOhm), making it functionally compatible for direct replacement in applications requiring the 744045008.

Parameter Comparison

Engineering Selection Recommendations

Both the Würth Elektronik 744045008 and Bourns SDR0403-8R2ML are active production components with full RoHS3 compliance and REACH unaffected status. Selection between these parts should be based on availability, lead time, and packaging format requirements. The Bourns substitute provides improved electrical performance with higher current rating and lower DC resistance, making it suitable for applications with tighter thermal or current margin requirements. Both components maintain identical operating temperature ranges and moisture sensitivity classifications, ensuring equivalent reliability in production environments.

Frequently Asked Questions (FAQ)

Q: Can the Bourns SDR0403-8R2ML directly replace the Würth 744045008 in existing designs?

A: Yes. Both inductors share identical 8.2 µH inductance values with ±20% tolerance, ferrite unshielded drum core construction, and -40°C to 125°C operating temperature range. The Bourns part provides superior current handling (1.26 A vs 1 A) and lower DC resistance (130 mOhm vs 250 mOhm), making it functionally compatible for direct substitution.

Q: Are there package compatibility concerns between these parts?

A: The Würth 744045008 uses the standard 1812 (4532 Metric) package at 4.50mm x 3.20mm x 2.90mm height. The Bourns SDR0403-8R2ML uses a nonstandard package at 4.50mm x 4.00mm x 4.60mm height. While length matches, the width and height differ. PCB layout and component clearance must be verified before substitution.

Q: Do both parts meet the same regulatory requirements?

A: Yes. Both the Würth 744045008 and Bourns SDR0403-8R2ML are ROHS3 compliant, REACH unaffected, and carry MSL 1 (unlimited) moisture sensitivity ratings. They are equivalent for regulatory and environmental compliance purposes.

Q: What is the primary advantage of the Bourns substitute?

A: The Bourns SDR0403-8R2ML offers lower DC resistance (130 mOhm vs 250 mOhm) and higher current rating (1.26 A vs 1 A), reducing power dissipation and thermal stress in the circuit while maintaining identical inductance and core characteristics.

Q: Are there any frequency response differences between these inductors?

A: The Würth part specifies Q @ 36 at 1 MHz with 34 MHz self-resonant frequency. The Bourns part specifies Q @ 28 at 7.96 MHz with 36 MHz self-resonant frequency. These differences reflect different measurement conditions and core designs but do not affect substitution eligibility for standard 8.2 µH applications.