CD43NP-3R3MC Equivalent & Substitute Parts

Part Overview

The CD43NP-3R3MC is a 3.3 µH fixed unshielded inductor manufactured by Sumida America Components Inc., designed for surface mount applications requiring 2 A current handling capability. This component is classified as Active product status and is RoHS3 compliant. Substitute parts are identified when equivalent electrical performance and mechanical compatibility can be maintained within the specified parameter tolerances for this inductance value and current rating category.

Substiute Parts

CD43NP-3R3MC

Sumida America Components Inc.In Stock: 2400CD43NP-3R3MC Datasheet

Current PartRFQ

SDR0403-3R3ML

Bourns Inc.In Stock: 9086SDR0403-3R3ML Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the CD43NP-3R3MC are qualified based on the following critical parameters:

Inductance Value: Substitute parts must maintain 3.3 µH inductance within the ±20% tolerance band, ensuring functional equivalence in circuit applications.

Current Rating: Substitute parts must support a minimum current rating of 2 A. Parts with higher current ratings (2.15 A or greater) are acceptable as they provide equivalent or superior current handling capability.

DC Resistance (DCR): Substitute parts must maintain DCR at or below 86.2 mOhm maximum to ensure equivalent power dissipation characteristics and thermal performance.

Shielding Configuration: Substitute parts must be unshielded to maintain electromagnetic compatibility with the original design.

Core Material: Substitute parts must use ferrite core material to maintain magnetic performance characteristics.

Mounting Type: Substitute parts must be surface mount to ensure mechanical compatibility with PCB assembly processes.

Package Dimensions: Substitute parts must conform to the 4.50mm x 4.00mm x 3.50mm (L x W x H) nonstandard package size for mechanical fit on the PCB.

Compliance: Substitute parts must maintain RoHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating.

Parameter Comparison

Engineering Selection Recommendations

Primary Part: CD43NP-3R3MC

The CD43NP-3R3MC remains the primary selection when Sumida components are specified or preferred in the design. This part is Active status, RoHS3 compliant, and maintains full compliance with MSL 1 moisture sensitivity requirements. Current inventory of 2300 pieces supports production requirements.

Substitute Part: SDR0403-3R3ML

The SDR0403-3R3ML from Bourns Inc. qualifies as a direct substitute based on electrical and mechanical parameter equivalence. This part meets or exceeds all critical specifications:

• Inductance value and tolerance match the original specification
• Current rating of 2.15 A exceeds the 2 A requirement
• DC resistance of 58 mOhm is superior to the 86.2 mOhm maximum, resulting in lower power dissipation
• Operating temperature range extends to 125°C, providing wider thermal margin
• Package dimensions are identical, ensuring mechanical compatibility
• RoHS3 compliance and MSL 1 rating maintain regulatory and environmental requirements
• Active product status ensures continued availability

The SDR0403-3R3ML is suitable for direct substitution in applications where Bourns components are acceptable or when supply chain considerations favor this alternative. Higher inventory availability (9054 pieces) may support extended production schedules.

Frequently Asked Questions (FAQ)

Q: Can the SDR0403-3R3ML replace the CD43NP-3R3MC in existing designs without circuit modification?

A: Yes. Both parts maintain identical inductance values (3.3 µH ±20%), identical package dimensions (4.50mm x 4.00mm x 3.50mm), and equivalent electrical characteristics within the specified tolerance band. No circuit modifications are required.

Q: What is the significance of the lower DC resistance in the SDR0403-3R3ML?

A: The SDR0403-3R3ML exhibits 58 mOhm maximum DCR compared to 86.2 mOhm maximum in the CD43NP-3R3MC. Lower DCR reduces resistive power dissipation (I²R losses), resulting in lower operating temperature and improved efficiency in the application circuit.

Q: Are both parts suitable for the same operating temperature range?

A: The CD43NP-3R3MC operates from -40°C to 100°C, while the SDR0403-3R3ML operates from -40°C to 125°C. The SDR0403-3R3ML provides a wider operating temperature margin. For applications within the -40°C to 100°C range, both parts are equivalent. For applications requiring operation above 100°C, only the SDR0403-3R3ML is suitable.

Q: Do both parts meet the same compliance requirements?

A: Yes. Both the CD43NP-3R3MC and SDR0403-3R3ML are RoHS3 compliant and carry MSL 1 (Unlimited) moisture sensitivity ratings. Both parts meet ECCN EAR99 and HTSUS 8504.50.4000 classifications.

Q: What is the difference between the core construction types?

A: The CD43NP-3R3MC uses a standard ferrite core construction. The SDR0403-3R3ML uses a ferrite drum core with wirewound construction. Both configurations deliver the specified 3.3 µH inductance and maintain unshielded operation. The wirewound construction in the SDR0403-3R3ML contributes to its lower DCR specification.

Q: Can these parts be used interchangeably in tape and reel packaging?

A: Yes. Both parts are supplied in Tape & Reel (TR) packaging, which is standard for surface mount assembly processes. Packaging format is equivalent between the two parts.

Q: What should be verified when transitioning from CD43NP-3R3MC to SDR0403-3R3ML?

A: Verify that the substitute part's higher current rating (2.15 A vs. 2 A) and lower DCR (58 mOhm vs. 86.2 mOhm) do not introduce unintended circuit behavior. Confirm that the extended operating temperature range (-40°C to 125°C) is compatible with the application's thermal environment. Validate that Bourns component qualification is acceptable within your supply chain and quality management system.