CD43NP-1R0MC Equivalent & Substitute Parts

Part Overview

The CD43NP-1R0MC is a 1 µH fixed unshielded inductor manufactured by Sumida America Components Inc., rated for 2.7 A continuous current with a maximum DC resistance of 48.7 mOhm. This component is classified as Active product status with full RoHS3 compliance and unlimited moisture sensitivity rating (MSL 1). The part is packaged in Surface Mount configuration with nonstandard dimensions of 4.50mm × 4.00mm × 3.50mm (max height).

Substitute parts are identified when equivalent electrical performance can be maintained across critical parameters including inductance value, current rating, DC resistance, operating temperature range, and physical package compatibility. Substitution becomes necessary due to inventory availability, supply chain optimization, or design flexibility requirements.

Substiute Parts

CD43NP-1R0MC

Sumida America Components Inc.In Stock: 823CD43NP-1R0MC Datasheet

Current PartRFQ

SDR0403-1R0ML

Bourns Inc.In Stock: 25489SDR0403-1R0ML Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the CD43NP-1R0MC is determined by strict adherence to the following parameters:

Inductance Specification: The substitute part must provide exactly 1 µH inductance with ±20% tolerance. This is the primary functional requirement and cannot be deviated.

Current Rating: The substitute must support a minimum continuous current rating of 2.7 A. Substitutes with higher current ratings are acceptable as they provide equal or superior performance margin.

DC Resistance: The substitute's maximum DC resistance must not exceed 48.7 mOhm. Lower DC resistance values are acceptable and indicate improved electrical efficiency.

Operating Temperature Range: The substitute must maintain performance across the -40°C to 100°C operating window. Substitutes with extended temperature ranges (such as -40°C to 125°C) are acceptable.

Physical Package: The substitute must match the nonstandard Surface Mount package dimensions of 4.50mm length × 4.00mm width × 3.50mm maximum seated height.

Shielding Configuration: The substitute must be unshielded to maintain electromagnetic compatibility with the original design.

Regulatory Compliance: The substitute must maintain RoHS3 compliance and MSL 1 rating to ensure environmental and moisture handling compatibility.

Parameter Comparison

Engineering Selection Recommendations

The SDR0403-1R0ML from Bourns Inc. qualifies as a direct substitute for the CD43NP-1R0MC based on the following engineering criteria:

Electrical Equivalence: Both parts deliver 1 µH inductance with identical ±20% tolerance specifications. The SDR0403-1R0ML provides superior electrical characteristics with 33 mOhm maximum DC resistance compared to 48.7 mOhm, resulting in lower power dissipation and improved thermal performance in the application circuit.

Current Capacity: The substitute's 3.8 A current rating exceeds the original part's 2.7 A requirement, providing additional design margin and thermal headroom for transient current conditions.

Temperature Performance: The SDR0403-1R0ML extends the operating temperature range to -40°C to 125°C, surpassing the original -40°C to 100°C specification. This enhancement supports applications requiring extended thermal operating windows.

Physical Compatibility: Both parts share identical Surface Mount package dimensions (4.50mm × 4.00mm × 3.50mm maximum height), ensuring direct PCB footprint compatibility without layout modifications.

Regulatory Compliance: Both parts maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity ratings, ensuring equivalent environmental and handling requirements throughout the supply chain and manufacturing process.

Product Status: Both parts carry Active product status with established supply availability. The SDR0403-1R0ML maintains 25,400 pieces in stock inventory, supporting production volume requirements.

Frequently Asked Questions (FAQ)

Q: Can the SDR0403-1R0ML be used as a direct replacement for CD43NP-1R0MC without PCB modifications?

A: Yes. Both parts share identical Surface Mount package dimensions of 4.50mm × 4.00mm × 3.50mm maximum height. No PCB layout or footprint changes are required for substitution.

Q: What is the impact of the lower DC resistance (33 mOhm vs. 48.7 mOhm) on circuit performance?

A: Lower DC resistance reduces resistive power loss in the inductor. For a given current level, the SDR0403-1R0ML dissipates less heat than the CD43NP-1R0MC, improving overall circuit efficiency and thermal performance.

Q: Does the higher current rating (3.8 A vs. 2.7 A) of the substitute part affect circuit operation?

A: No. The higher current rating provides additional design margin and thermal capacity. The substitute will perform identically to the original part at the design current level while offering improved reliability under transient or peak current conditions.

Q: Are the inductance tolerance specifications identical between both parts?

A: Yes. Both the CD43NP-1R0MC and SDR0403-1R0ML specify ±20% inductance tolerance, ensuring equivalent circuit performance and filter response characteristics.

Q: What is the significance of the extended temperature range (-40°C to 125°C) in the substitute part?

A: The substitute's extended upper temperature limit of 125°C (versus 100°C for the original) supports applications in higher ambient temperature environments or equipment with elevated internal operating temperatures. This provides additional thermal margin for reliability.

Q: Are both parts RoHS3 compliant?

A: Yes. Both the CD43NP-1R0MC and SDR0403-1R0ML are RoHS3 compliant with MSL 1 (Unlimited) moisture sensitivity ratings, ensuring equivalent environmental and handling requirements.

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

A: The CD43NP-1R0MC uses ferrite core construction. The SDR0403-1R0ML is specified as a drum core, wirewound inductor with ferrite material. Both are unshielded configurations suitable for the same application environments.

Q: Can substitution be performed mid-production without design review?

A: Substitution is electrically and mechanically compatible based on provided specifications. However, standard engineering change control procedures should be followed to document the substitution in design records and bill of materials.