LQH66SN331M03L Equivalent & Substitute Parts

Part Overview

The LQH66SN331M03L is a 330 µH shielded drum core wirewound inductor manufactured by Murata Electronics, rated for 280 mA with a maximum DC resistance of 2.52Ohm. This surface mount component is designed for applications requiring fixed inductance in compact form factors. The part is discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives that maintain core electrical and mechanical specifications for seamless integration into existing designs.

Substiute Parts

LQH66SN331M03L

Murata ElectronicsIn Stock: 3223LQH66SN331M03L Datasheet

Current PartRFQ

74404064331

Würth ElektronikIn Stock: 486174404064331 Datasheet

MFR RecommendedRFQ

UP1B-331-R

Eaton - Electronics DivisionIn Stock: 1145UP1B-331-R Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LQH66SN331M03L is determined by the following critical parameters:

Primary Matching Criteria:

• Inductance value: 330 µH (fixed requirement)
• Inductance tolerance: ±20% (fixed requirement)
• Mounting type: Surface Mount (fixed requirement)
• Inductance test frequency: 100 kHz (fixed requirement)

Secondary Compatibility Factors:

• Current rating must equal or exceed 280 mA
• DC resistance should not significantly exceed 2.52Ohm to maintain circuit performance
• Shielding type (shielded vs. unshielded) affects EMI characteristics and board layout
• Operating temperature range must encompass the application's thermal requirements
• Package dimensions and height affect PCB footprint compatibility

Two substitute parts are identified based on these criteria, each with distinct trade-offs in current capacity, DC resistance, and shielding characteristics.

Parameter Comparison

Engineering Selection Recommendations

74404064331 (Würth Elektronik WE-LQS Series): This substitute offers superior electrical performance with 510 mA current rating and significantly lower DC resistance of 1.177Ohm compared to the original 2.52Ohm. The shielded design maintains EMI performance equivalent to the main part. Extended operating temperature range (-40°C ~ 125°C) provides thermal margin beyond the original specification. AEC-Q200 automotive qualification adds reliability certification. Slightly smaller package footprint (6.00mm vs. 6.30mm) and reduced height (4.50mm vs. 5.00mm) may require PCB layout verification. Active product status ensures long-term availability.

UP1B-331-R (Eaton UNI-PAC™ Series): This substitute maintains identical current rating (280 mA) and core material (ferrite) as the original part, with matching height (5.00mm). However, DC resistance is higher at 3.1Ohm compared to 2.52Ohm, resulting in increased power dissipation. The unshielded design differs from the original shielded configuration, affecting EMI characteristics and requiring board layout reassessment. Larger footprint (8.89mm x 6.10mm) may present space constraints. Active product status ensures availability. Operating temperature range (-40°C ~ 85°C) exceeds the original specification.

Frequently Asked Questions (FAQ)

Q: Can the 74404064331 substitute for the LQH66SN331M03L in all applications? A: The 74404064331 matches all critical electrical parameters (330 µH inductance, ±20% tolerance, 100 kHz test frequency) and exceeds current rating requirements. Shielding characteristics are identical. Verify PCB layout compatibility due to slightly smaller package dimensions (6.00mm vs. 6.30mm) and reduced height (4.50mm vs. 5.00mm).

Q: What is the impact of the UP1B-331-R's higher DC resistance? A: The UP1B-331-R exhibits 3.1Ohm DC resistance versus the original 2.52Ohm, representing a 23% increase. This results in higher resistive losses and increased power dissipation. Applications sensitive to inductor losses or thermal performance should use the 74404064331 alternative instead.

Q: Why is the UP1B-331-R unshielded while the original is shielded? A: Shielding affects electromagnetic field containment and EMI performance. Unshielded inductors may couple more strongly with adjacent circuit elements. Applications requiring EMI suppression or operating in electromagnetically sensitive environments should prioritize the shielded 74404064331 substitute.

Q: Are there package footprint compatibility concerns? A: The 74404064331 uses a 6045 package (6.00mm x 6.00mm x 4.50mm height) versus the original 2525 package (6.30mm x 6.30mm x 5.00mm height). The UP1B-331-R footprint is significantly larger (8.89mm x 6.10mm x 5.00mm height). Verify PCB pad layouts and clearances before component selection.

Q: Do all substitutes meet RoHS compliance? A: Both substitutes are RoHS compliant. The 74404064331 is ROHS3 compliant, matching the original specification. The UP1B-331-R is RoHS compliant. Both meet REACH requirements.

Q: What is the significance of the 74404064331's AEC-Q200 rating? A: AEC-Q200 is an automotive qualification standard indicating the component has undergone rigorous reliability testing for automotive applications. This certification is not present in the original LQH66SN331M03L or the UP1B-331-R, providing additional assurance for mission-critical applications.