CD43NP-2R7MC Equivalent & Substitute Parts

Part Overview

The CD43NP-2R7MC is a 2.7 µH unshielded ferrite core inductor manufactured by Sumida America Components Inc. This surface mount component is rated for 2.16 A continuous current with a maximum DC resistance of 78.7 mOhm. The part is classified as Active status and is RoHS3 compliant, making it suitable for modern electronic applications requiring compact inductance in power conversion, filtering, and signal conditioning circuits.

Substitute parts are identified when equivalent electrical performance can be achieved within the specified parameter tolerances while maintaining mechanical compatibility and compliance requirements.

Key Parameters

Parameter	Value	Unit
Inductance	2.7	µH
Inductance Tolerance	±20%	%
Current Rating	2.16	A
DC Resistance (Max)	78.7	mOhm
Core Material	Ferrite	—
Shielding	Unshielded	—
Package Size	4.50 x 4.00 x 3.50 mm	L x W x H
Mounting Type	Surface Mount	—
Operating Temperature	-40 to 100	°C
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

The SDR0403-2R7ML from Bourns Inc. qualifies as a direct substitute for the CD43NP-2R7MC based on the following alignment of critical parameters:

Matching Electrical Specifications:

Inductance value: 2.7 µH (identical)
Inductance tolerance: ±20% (identical)
Core material: Ferrite (identical)
Shielding configuration: Unshielded (identical)

Compatible Mechanical Specifications:

Package dimensions: 4.50 x 4.00 x 3.50 mm (identical)
Mounting type: Surface Mount (identical)
Packaging format: Tape & Reel (identical)

Compliance Alignment:

RoHS3 compliant (both parts)
ECCN classification: EAR99 (both parts)
HTSUS code: 8504.50.4000 (both parts)

The SDR0403-2R7ML exhibits superior electrical performance characteristics including higher current rating (2.43 A vs. 2.16 A), lower DC resistance (52 mOhm vs. 78.7 mOhm), and extended operating temperature range (-40 to 125°C vs. -40 to 100°C), while maintaining full mechanical and compliance compatibility.

Parameter Comparison

Parameter	CD43NP-2R7MC (Sumida)	SDR0403-2R7ML (Bourns)	Match Status
Inductance	2.7 µH	2.7 µH	Identical
Inductance Tolerance	±20%	±20%	Identical
Current Rating	2.16 A	2.43 A	Compatible (Higher)
DC Resistance (Max)	78.7 mOhm	52 mOhm	Compatible (Lower)
Core Material	Ferrite	Ferrite	Identical
Shielding	Unshielded	Unshielded	Identical
Package Size (L x W x H)	4.50 x 4.00 x 3.50 mm	4.50 x 4.00 x 3.50 mm	Identical
Mounting Type	Surface Mount	Surface Mount	Identical
Operating Temperature Range	-40 to 100°C	-40 to 125°C	Compatible (Extended)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Identical
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	Identical
ECCN	EAR99	EAR99	Identical

Engineering Selection Recommendations

Primary Part: CD43NP-2R7MC

The CD43NP-2R7MC remains the specified component when design requirements explicitly call for Sumida manufacturing or when supply chain qualification mandates the original manufacturer. This part maintains Active product status and full RoHS3 compliance.

Substitute Part: SDR0403-2R7ML

The SDR0403-2R7ML is qualified for direct substitution in applications where the CD43NP-2R7MC is unavailable. This Bourns component provides equivalent inductance and tolerance specifications with enhanced electrical performance margins. The lower DC resistance (52 mOhm vs. 78.7 mOhm) reduces resistive losses, and the higher current rating (2.43 A vs. 2.16 A) provides additional design margin. The extended operating temperature range (-40 to 125°C) accommodates broader thermal environments. Both parts maintain identical mechanical footprints and compliance certifications, enabling direct PCB-level substitution without layout modification.

Both parts are Active status products with ROHS3 compliance and unlimited moisture sensitivity rating, confirming suitability for current manufacturing standards.

Frequently Asked Questions (FAQ)

Q: Can the SDR0403-2R7ML be used as a direct replacement for the CD43NP-2R7MC on the PCB?

A: Yes. Both inductors share identical package dimensions (4.50 x 4.00 x 3.50 mm) and surface mount configuration, enabling direct PCB substitution without layout changes.

Q: What are the key electrical differences between these two parts?

A: The SDR0403-2R7ML provides lower DC resistance (52 mOhm vs. 78.7 mOhm) and higher current rating (2.43 A vs. 2.16 A). Both maintain the same 2.7 µH inductance value and ±20% tolerance. The Bourns part also supports an extended operating temperature range to 125°C compared to 100°C for the Sumida part.

Q: Are both parts RoHS3 compliant?

A: Yes. Both the CD43NP-2R7MC and SDR0403-2R7ML are RoHS3 compliant with MSL rating of 1 (Unlimited), meeting current environmental and manufacturing standards.

Q: What is the inductance tolerance for both parts?

A: Both inductors are specified with ±20% inductance tolerance, ensuring equivalent circuit performance within design specifications.

Q: Do these parts have different core constructions?

A: Both parts use ferrite core material in unshielded configuration. The SDR0403-2R7ML is specified as drum core wirewound construction, while the CD43NP-2R7MC core type is not detailed in the provided specifications. Both deliver equivalent inductance performance.

Q: Can the SDR0403-2R7ML handle higher current than the CD43NP-2R7MC?

A: Yes. The SDR0403-2R7ML is rated for 2.43 A continuous current compared to 2.16 A for the CD43NP-2R7MC, providing approximately 12% additional current capacity.

Q: Are there any packaging differences between these inductors?

A: No. Both parts are supplied in Tape & Reel (TR) packaging format, maintaining identical handling and assembly compatibility.

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