L4018C2R2MDWDT Equivalent & Substitute Parts

Part Overview

The L4018C2R2MDWDT is a 2.2 µH shielded drum core wirewound inductor manufactured by KEMET, rated for 1.44 A continuous current with a maximum DC resistance of 60mOhm. This component is classified as obsolete, necessitating identification of equivalent substitute parts for ongoing production and maintenance applications. The part operates across a temperature range of -25°C to 120°C and is housed in a nonstandard 4.00mm x 4.00mm surface mount package with a seated height of 1.80mm maximum.

Substiute Parts

L4018C2R2MDWDT

KEMETIn Stock: 986L4018C2R2MDWDT Datasheet

Current PartRFQ

NR4018T2R2M

Taiyo YudenIn Stock: 15999NR4018T2R2M Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the L4018C2R2MDWDT are identified based on strict electrical and mechanical parameter matching within the allowed tolerances for this inductor category. The substitution criteria are:

Primary Matching Parameters:

• Inductance value: 2.2 µH (±20% tolerance band)
• Current rating: 1.44 A minimum
• Core type: Ferrite, shielded drum core wirewound construction
• Package dimensions: 4.00mm x 4.00mm footprint with 1.80mm maximum seated height
• Operating temperature range: -25°C to 120°C minimum
• Surface mount configuration

Secondary Compatibility Parameters:

• DC resistance within acceptable operating limits
• Self-resonant frequency at 52MHz
• RoHS3 compliance and MSL Level 1 rating
• Nonstandard package classification

The NR4018T2R2M from Taiyo Yuden meets all primary and secondary matching criteria, with the exception of DC resistance specification (72mOhm maximum versus 60mOhm maximum on the original part). This variance remains within acceptable substitution parameters for equivalent functionality in the specified application envelope.

Parameter Comparison

Engineering Selection Recommendations

The L4018C2R2MDWDT is classified as obsolete, making the NR4018T2R2M the primary equivalent substitute. Both components maintain identical electrical specifications for inductance, current rating, and operating temperature range. The NR4018T2R2M carries a "Not For New Designs" status, indicating limited long-term availability but current production support.

The 12mOhm increase in maximum DC resistance (from 60mOhm to 72mOhm) on the substitute part represents a 20% variance. This difference must be evaluated within the context of the specific application's power dissipation and thermal management requirements. Both parts maintain ROHS3 compliance and MSL Level 1 moisture sensitivity ratings, ensuring compatibility with standard manufacturing and storage protocols.

For applications requiring the original 60mOhm specification, alternative cross-references listed for the NR4018T2R2M include BWVS004040182R2M00, SRN4018-2R2M, BWVS004040182R2T00, and LSXBD4040TKL2R2M, which may provide additional sourcing options with equivalent or superior DC resistance characteristics.

Frequently Asked Questions (FAQ)

Q: Can the NR4018T2R2M directly replace the L4018C2R2MDWDT in existing designs?

A: The NR4018T2R2M is electrically and mechanically compatible with the L4018C2R2MDWDT for applications where the 72mOhm maximum DC resistance specification is acceptable. Both components share identical inductance values, current ratings, package dimensions, and operating temperature ranges. The increased DC resistance must be evaluated against circuit power dissipation requirements.

Q: What is the significance of the "Obsolete" and "Not For New Designs" product status designations?

A: The L4018C2R2MDWDT is classified as obsolete, indicating discontinued manufacturing and limited inventory availability. The NR4018T2R2M carries a "Not For New Designs" status, signifying that while current stock exists, the manufacturer does not recommend its use in new product development. Both statuses necessitate identification of long-term substitute sources.

Q: Are the package dimensions identical between the main part and substitute?

A: Yes. Both the L4018C2R2MDWDT and NR4018T2R2M utilize a 4.00mm x 4.00mm footprint with a maximum seated height of 1.80mm, ensuring direct mechanical compatibility in surface mount applications without PCB layout modifications.

Q: Do both parts meet current environmental and compliance standards?

A: Both components are ROHS3 compliant and carry MSL Level 1 (Unlimited) moisture sensitivity ratings. These certifications confirm compatibility with current manufacturing standards and storage requirements without special handling protocols.

Q: What is the inductance tolerance specification, and how does it affect circuit design?

A: Both parts carry a ±20% inductance tolerance. This tolerance band must be incorporated into circuit design calculations to ensure proper operation across the full tolerance range. The 2.2 µH specification operates within a range of 1.76 µH to 2.64 µH at the tolerance extremes.

Q: How does the DC resistance difference impact thermal performance?

A: The NR4018T2R2M exhibits a maximum DC resistance of 72mOhm compared to 60mOhm on the original part. At the rated 1.44 A current, this results in a power dissipation increase of approximately 0.025 W (25mW). Thermal management analysis is required for applications operating at or near maximum current ratings in thermally constrained environments.