CD43NP-1R4MC Equivalent & Substitute Parts

Part Overview

The CD43NP-1R4MC is a 1.4 µH unshielded ferrite core inductor manufactured by Sumida America Components Inc., rated for 2.5 A continuous current with a maximum DC resistance of 56.2mOhm. This component is classified as Active product status and is RoHS3 compliant. The part is packaged in Tape & Reel format for automated assembly processes.

Substitute parts are identified when equivalent electrical performance can be maintained within the specified parameter tolerances while meeting the same mechanical and environmental requirements. The primary substitute for this component is the SDR0403-1R4ML from Bourns Inc., which maintains the same inductance value and core material while offering enhanced current handling capability.

Substiute Parts

CD43NP-1R4MC

Sumida America Components Inc.In Stock: 674CD43NP-1R4MC Datasheet

Current PartRFQ

SDR0403-1R4ML

Bourns Inc.In Stock: 8880SDR0403-1R4ML Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the CD43NP-1R4MC is determined by the following critical parameters:

Mandatory Matching Parameters:

• Inductance value: 1.4 µH (within ±20% tolerance)
• Core material: Ferrite
• Shielding configuration: Unshielded
• Mounting type: Surface Mount
• Physical package dimensions: 4.50mm x 4.00mm x 4.00mm maximum

Allowable Variation Parameters:

• Current rating: Substitute must equal or exceed 2.5 A
• DC resistance: Substitute must not exceed 56.2mOhm maximum
• Operating temperature range: Substitute must cover or exceed -40°C to 100°C
• RoHS and MSL compliance: Substitute must maintain equivalent or superior compliance status

The SDR0403-1R4ML from Bourns Inc. qualifies as a direct substitute because it maintains identical inductance, core material, shielding type, and physical dimensions while providing superior current handling (3.3 A versus 2.5 A) and lower DC resistance (38mOhm versus 56.2mOhm). Both components are ferrite-core, unshielded surface mount inductors with identical footprints and are RoHS3 compliant.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: SDR0403-1R4ML (Bourns Inc.)

The SDR0403-1R4ML is qualified as a direct substitute for the CD43NP-1R4MC based on the following engineering criteria:

1. Electrical Equivalence: Both components deliver 1.4 µH inductance with ±20% tolerance. The Bourns substitute provides superior electrical performance with lower DC resistance (38mOhm versus 56.2mOhm), resulting in reduced power dissipation in the application circuit.

2. Current Handling: The SDR0403-1R4ML is rated for 3.3 A continuous current, exceeding the CD43NP-1R4MC requirement of 2.5 A. This provides additional design margin and thermal headroom.

3. Thermal Performance: The substitute operates across -40°C to 125°C, extending the upper temperature limit by 25°C compared to the original part's -40°C to 100°C range.

4. Compliance Status: Both components are RoHS3 compliant and carry MSL 1 (Unlimited) moisture sensitivity rating, ensuring equivalent environmental and regulatory compliance.

5. Physical Compatibility: Identical package dimensions (4.50mm x 4.00mm x 3.50mm) and surface mount configuration ensure direct PCB footprint compatibility without layout modifications.

6. Product Status: Both components maintain Active product status, ensuring continued availability and supply chain stability.

Frequently Asked Questions (FAQ)

Q: Can the SDR0403-1R4ML be used as a direct replacement for the CD43NP-1R4MC without PCB modifications?

A: Yes. Both inductors share identical physical dimensions (4.50mm x 4.00mm x 3.50mm) and surface mount configuration. No PCB layout changes are required for substitution.

Q: What is the significance of the lower DC resistance in the Bourns substitute?

A: The SDR0403-1R4ML exhibits 38mOhm maximum DC resistance compared to 56.2mOhm in the original part. This 32% reduction in resistance decreases I²R power losses, improving circuit efficiency and reducing thermal stress on the component.

Q: Does the higher current rating of the SDR0403-1R4ML affect circuit operation?

A: No. The 3.3 A rating of the substitute exceeds the 2.5 A requirement of the original design. This provides additional design margin without altering circuit behavior. The component will operate within its rated specifications in any application designed for the CD43NP-1R4MC.

Q: Are there any temperature-related considerations when substituting?

A: The SDR0403-1R4ML operates to 125°C, compared to 100°C for the CD43NP-1R4MC. This extended range is advantageous and poses no compatibility issues. Applications operating within the original -40°C to 100°C specification will function identically with the substitute.

Q: What is the difference between the inductance test frequencies listed for each part?

A: The CD43NP-1R4MC specifies inductance measurement at 7.96 MHz, while the SDR0403-1R4ML uses 1 kHz. Both measurements confirm the 1.4 µH nominal value within ±20% tolerance. The different test frequencies reflect manufacturer measurement standards and do not affect circuit compatibility.

Q: Are both components available in the same packaging format?

A: Yes. Both the CD43NP-1R4MC and SDR0403-1R4ML are supplied in Tape & Reel (TR) packaging, suitable for automated assembly processes.

Q: What is the saturation current specification, and why does only the substitute list this parameter?

A: The SDR0403-1R4ML specifies saturation current (Isat) at 5.1 A. This indicates the current level at which the ferrite core begins to saturate, reducing inductance. The original CD43NP-1R4MC does not provide this specification in the available data. Both components operate well below saturation at their respective rated currents (2.5 A and 3.3 A).

Q: Are there any compliance or certification differences between the two parts?

A: Both components are RoHS3 compliant, carry MSL 1 (Unlimited) moisture sensitivity rating, and share identical ECCN (EAR99) and HTSUS (8504.50.4000) classifications. No compliance differences exist between the parts.