LQH55DN331M03L Equivalent & Substitute Parts

Part Overview

The LQH55DN331M03L is a 330 µH unshielded drum core wirewound inductor manufactured by Murata Electronics, rated for 270 mA with a maximum DC resistance of 6.16Ohm. This component is designed for surface mount applications in the 2220 (5750 Metric) package format. The part is discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives that maintain the core electrical and mechanical specifications required for direct board-level substitution.

Substiute Parts

LQH55DN331M03L

Murata ElectronicsIn Stock: 2465LQH55DN331M03L Datasheet

Current PartRFQ

74404054331

Würth ElektronikIn Stock: 299974404054331 Datasheet

MFR RecommendedRFQ

B82462G4334M000

EPCOS - TDK ElectronicsIn Stock: 29732B82462G4334M000 Datasheet

MFR RecommendedRFQ

SDR0604-331KL

Bourns Inc.In Stock: 8421SDR0604-331KL Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LQH55DN331M03L are selected based on the following critical parameters that determine functional equivalence:

Core Electrical Parameters:

• Inductance value of 330 µH (±20% tolerance acceptable)
• Current rating of 270 mA or higher
• DC resistance within acceptable operating limits
• Ferrite core material
• Surface mount configuration

Environmental & Compliance Parameters:

• Operating temperature range that encompasses or exceeds -40°C ~ 80°C
• ROHS3 compliance
• MSL rating of 1 (Unlimited)

The three identified substitutes meet these criteria with variations in shielding configuration, package dimensions, and DCR specifications. All maintain the 330 µH inductance value and support the 270 mA current requirement.

Parameter Comparison

Engineering Selection Recommendations

74404054331 (Würth Elektronik WE-LQS Series)

This substitute offers improved current handling at 400 mA with significantly reduced DCR of 2.1Ohm. The semi-shielded configuration provides electromagnetic interference mitigation. Extended operating temperature range to 125°C and AEC-Q200 rating support automotive and industrial applications. Active product status ensures long-term availability.

B82462G4334M000 (EPCOS - TDK Electronics B82462G4 Series)

This option provides the widest operating temperature range (-55°C ~ 150°C) and shielded construction for noise-sensitive applications. Matched current rating of 270 mA with reduced DCR of 2.3Ohm. AEC-Q200 certification and active product status provide supply chain stability. Larger package footprint (6.30mm x 6.30mm) requires PCB layout verification.

SDR0604-331KL (Bourns SDR0604 Series)

This substitute maintains unshielded configuration matching the original part. Tighter inductance tolerance of ±10% provides improved precision. Higher saturation current of 360 mA offers design margin. Active product status and extended temperature range to 125°C ensure availability and performance across operating conditions.

Frequently Asked Questions (FAQ)

Q: Can the LQH55DN331M03L be directly replaced with any of these substitutes?

A: All three substitutes maintain the 330 µH inductance value and support the 270 mA current requirement. Direct PCB substitution is possible with the SDR0604-331KL (unshielded, matching configuration). The Würth Elektronik and EPCOS options require verification of shielding effects on circuit performance and PCB layout compatibility due to different package dimensions.

Q: What is the impact of different DC resistance values?

A: The original part specifies 6.16Ohm maximum DCR. All substitutes feature significantly lower DCR (2.1Ohm to 2.25Ohm), resulting in reduced power dissipation and improved efficiency. Circuit designs relying on the higher DCR value for current limiting or thermal management require re-evaluation.

Q: How do shielding differences affect circuit performance?

A: The original LQH55DN331M03L is unshielded. The Würth Elektronik substitute is semi-shielded, and the EPCOS option is fully shielded. Shielded configurations reduce electromagnetic radiation and susceptibility to external interference. Applications sensitive to EMI may benefit from shielded alternatives. Unshielded designs (Bourns SDR0604-331KL) maintain the original electromagnetic profile.

Q: Are package dimension differences critical?

A: The original part uses 2220 (5750 Metric) package format. Substitutes employ nonstandard packages with varying dimensions. The Bourns SDR0604-331KL (5.80mm x 5.80mm x 4.80mm) is closest in footprint. The EPCOS option (6.30mm x 6.30mm x 3.00mm) requires PCB layout verification for clearance and thermal management. The Würth Elektronik part (5.00mm x 5.00mm x 4.00mm) is the most compact.

Q: Which substitute is recommended for new designs?

A: Selection depends on application requirements. For automotive/industrial applications requiring AEC-Q200 certification, both Würth Elektronik and EPCOS options are qualified. For precision applications, the Bourns SDR0604-331KL offers tighter tolerance. For noise-sensitive circuits, the EPCOS shielded option provides maximum EMI rejection.

Q: Are all substitutes ROHS3 compliant?

A: Yes, all three substitutes are ROHS3 compliant with MSL rating of 1 (Unlimited), matching the original part's environmental specifications.