CD43NP-560KC Equivalent & Substitute Parts

Part Overview

The CD43NP-560KC is a 56 µH fixed unshielded inductor manufactured by Sumida America Components Inc., designed for surface mount applications with a current rating of 420 mA and maximum DC resistance of 937 mOhm. This component is classified as Active product status with ROHS3 compliance and unlimited moisture sensitivity rating (MSL 1). Substitute parts are identified when equivalent electrical performance and mechanical compatibility are required due to inventory constraints, supply chain considerations, or design flexibility within specified parameter tolerances.

Key Parameters

Parameter	Value	Unit
Inductance	56	µH
Inductance Tolerance	±10	%
Current Rating	420	mA
DC Resistance (Max)	937	mOhm
Shielding Type	Unshielded	—
Core Material	Ferrite	—
Mounting Type	Surface Mount	—
Package Dimensions	4.50 x 4.00 x 3.50	mm
Operating Temperature Range	-40 to 100	°C
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the CD43NP-560KC with the SDR0403-560KL is based on strict alignment of the following critical parameters:

Inductance Value: Both parts specify 56 µH with ±10% tolerance, ensuring electrical equivalence in circuit operation.

Inductance Tolerance: Identical ±10% tolerance maintains design margin consistency.

Shielding Configuration: Both components are unshielded, preserving electromagnetic coupling characteristics in the application.

Core Material: Both utilize ferrite core construction, maintaining frequency response and saturation behavior.

Mounting Type: Both are surface mount components compatible with identical PCB assembly processes.

Package Dimensions: Both share identical physical dimensions (4.50 x 4.00 x 3.50 mm), ensuring mechanical interchangeability in the same footprint.

Compliance Standards: Both are ROHS3 compliant with MSL 1 rating, meeting environmental and moisture sensitivity requirements.

The SDR0403-560KL provides enhanced current handling capability (500 mA versus 420 mA) and lower maximum DC resistance (940 mOhm versus 937 mOhm), representing a compatible upgrade within the same electrical class.

Parameter Comparison

Parameter	CD43NP-560KC (Sumida)	SDR0403-560KL (Bourns)	Compatibility
Inductance	56 µH	56 µH	Equivalent
Inductance Tolerance	±10%	±10%	Equivalent
Current Rating	420 mA	500 mA	Compatible (higher rating)
DC Resistance (Max)	937 mOhm	940 mOhm	Equivalent
Shielding	Unshielded	Unshielded	Equivalent
Core Material	Ferrite	Ferrite	Equivalent
Mounting Type	Surface Mount	Surface Mount	Equivalent
Package Dimensions (L x W x H)	4.50 x 4.00 x 3.50 mm	4.50 x 4.00 x 3.50 mm	Equivalent
Operating Temperature Range	-40 to 100°C	-40 to 125°C	Compatible (wider range)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Equivalent
Moisture Sensitivity Level	MSL 1 (Unlimited)	MSL 1 (Unlimited)	Equivalent

Engineering Selection Recommendations

Primary Selection (CD43NP-560KC): Select the Sumida CD43NP-560KC when inventory availability is confirmed and the specified current rating of 420 mA meets application requirements. This component maintains Active product status with established supply chain presence (1169 pcs in stock).

Substitute Selection (SDR0403-560KL): Select the Bourns SDR0403-560KL when the CD43NP-560KC is unavailable or when the application benefits from the higher current rating (500 mA) and extended operating temperature range (-40 to 125°C). Both components maintain ROHS3 compliance and identical mechanical footprints, ensuring direct PCB compatibility without layout modifications.

Compliance Verification: Both parts satisfy ROHS3 environmental requirements and carry MSL 1 moisture sensitivity classification, suitable for standard reflow soldering processes without special handling.

Frequently Asked Questions (FAQ)

Q: Can the SDR0403-560KL directly replace the CD43NP-560KC on the PCB?

A: Yes. Both components share identical package dimensions (4.50 x 4.00 x 3.50 mm) and surface mount configuration, enabling direct mechanical and electrical substitution without PCB redesign.

Q: What is the difference in current handling between these parts?

A: The CD43NP-560KC is rated for 420 mA, while the SDR0403-560KL is rated for 500 mA. The SDR0403-560KL provides 80 mA additional current capacity, making it suitable for applications requiring higher current margins.

Q: Are the inductance values identical?

A: Yes. Both parts specify 56 µH with ±10% tolerance, ensuring equivalent inductance performance in circuit operation.

Q: Do both parts meet the same environmental standards?

A: Yes. Both components are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating, meeting identical environmental and handling requirements.

Q: What is the DC resistance difference?

A: The CD43NP-560KC specifies 937 mOhm maximum DC resistance, while the SDR0403-560KL specifies 940 mOhm maximum. This 3 mOhm difference is negligible for most applications and falls within normal manufacturing tolerance.

Q: Can the SDR0403-560KL be used in applications with higher temperature requirements?

A: Yes. The SDR0403-560KL operates across -40 to 125°C, compared to the CD43NP-560KC range of -40 to 100°C, providing 25°C additional high-temperature margin.

Q: Are there any packaging differences between these inductors?

A: No. Both components are supplied in Tape & Reel (TR) packaging with identical nonstandard case dimensions, ensuring compatibility with standard SMD assembly equipment.

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