CD43NP-8R2MC Equivalent & Substitute Parts

Part Overview

The CD43NP-8R2MC is an 8.2 µH unshielded drum core wirewound inductor manufactured by Sumida America Components Inc. This surface mount component is designed for applications requiring fixed inductance with a current rating of 1.37 A and maximum DC resistance of 146.2 mOhm. The part is active in production and RoHS3 compliant, making it suitable for modern electronic assemblies. Substitute parts are identified based on matching electrical specifications and mechanical compatibility to ensure functional equivalence in circuit applications.

Key Parameters

Parameter	Value	Unit
Inductance	8.2	µH
Inductance Tolerance	±20%	-
Current Rating	1.37	A
DC Resistance (Max)	146.2	mOhm
Core Material	Ferrite	-
Shielding	Unshielded	-
Mounting Type	Surface Mount	-
Package Size	4.50 x 4.00 x 3.50	mm
Operating Temperature Range	-40 to 100	°C
RoHS Status	ROHS3 Compliant	-

Substitute Part Grouping Explanation

Substitute parts for the CD43NP-8R2MC are qualified based on the following critical parameters:

Electrical Equivalence Criteria:

Inductance value: 8.2 µH (matching specification)
Inductance tolerance: ±20% (identical tolerance band)
Core material: Ferrite (same magnetic core technology)
Shielding configuration: Unshielded (identical EMI characteristics)

Mechanical Compatibility Criteria:

Mounting type: Surface Mount (same assembly method)
Package dimensions: 4.50 x 4.00 x 3.50 mm (identical footprint and height)
Packaging format: Tape & Reel (TR) (same supply format)

Performance Considerations:

Current rating: Substitute must support minimum 1.26 A (acceptable for applications designed for 1.37 A)
DC resistance: Substitute maximum 130 mOhm (lower resistance acceptable)
Operating temperature: Substitute range must encompass or exceed -40°C to 100°C

Compliance Requirements:

RoHS3 compliance (mandatory for equivalent substitution)
ECCN and HTSUS classifications (maintained across substitutes)

Parameter Comparison

Parameter	CD43NP-8R2MC (Sumida)	SDR0403-8R2ML (Bourns)	Compatibility
Inductance	8.2 µH	8.2 µH	Matched
Inductance Tolerance	±20%	±20%	Matched
Current Rating	1.37 A	1.26 A	Acceptable (SDR0403 rated lower)
DC Resistance (Max)	146.2 mOhm	130 mOhm	Matched (SDR0403 lower)
Core Material	Ferrite	Ferrite	Matched
Shielding	Unshielded	Unshielded	Matched
Operating Temperature	-40 to 100°C	-40 to 125°C	Matched (SDR0403 extended range)
Package Size	4.50 x 4.00 x 3.50 mm	4.50 x 4.00 x 3.50 mm	Matched
Mounting Type	Surface Mount	Surface Mount	Matched
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Matched
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	Matched

Engineering Selection Recommendations

Primary Selection (CD43NP-8R2MC): The CD43NP-8R2MC remains the primary choice when specified in original designs. This part is active in production with 840 units in stock, ensuring supply continuity. RoHS3 compliance and EAR99 classification support standard commercial applications.

Substitute Selection (SDR0403-8R2ML): The SDR0403-8R2ML from Bourns Inc. qualifies as a direct substitute based on matched electrical and mechanical parameters. This part offers advantages including lower DC resistance (130 mOhm vs. 146.2 mOhm), extended operating temperature range (-40 to 125°C vs. -40 to 100°C), and higher inventory availability (5100 units in stock). The current rating of 1.26 A is acceptable for applications designed for the CD43NP-8R2MC's 1.37 A rating, provided circuit analysis confirms adequate margin. Both parts maintain identical RoHS3 compliance and ECCN/HTSUS classifications.

Substitution Validity: Substitution is valid when circuit requirements do not mandate the specific current rating differential or when thermal performance benefits from the extended temperature range. Both parts are active products with established supply chains.

Frequently Asked Questions (FAQ)

Q: Can SDR0403-8R2ML replace CD43NP-8R2MC in all applications?

A: SDR0403-8R2ML is electrically and mechanically compatible for applications where the 1.26 A current rating provides adequate margin above the circuit's maximum current demand. If the circuit requires the full 1.37 A capability of the CD43NP-8R2MC, circuit analysis must confirm that SDR0403-8R2ML's lower rating remains acceptable. Both parts share identical inductance, tolerance, core material, shielding, package dimensions, and mounting type.

Q: What are the key differences between these parts?

A: The primary differences are current rating (CD43NP-8R2MC: 1.37 A vs. SDR0403-8R2ML: 1.26 A), DC resistance (CD43NP-8R2MC: 146.2 mOhm max vs. SDR0403-8R2ML: 130 mOhm max), and operating temperature range (CD43NP-8R2MC: -40 to 100°C vs. SDR0403-8R2ML: -40 to 125°C). The SDR0403-8R2ML provides lower resistance and extended temperature capability.

Q: Are the package dimensions identical?

A: Yes. Both CD43NP-8R2MC and SDR0403-8R2ML share identical package dimensions of 4.50 x 4.00 x 3.50 mm (L x W x H). PCB footprints and assembly processes are interchangeable.

Q: Do both parts meet RoHS3 compliance?

A: Yes. Both CD43NP-8R2MC and SDR0403-8R2ML are RoHS3 compliant with MSL rating of 1 (Unlimited), suitable for standard commercial and industrial applications.

Q: What is the inductance tolerance for both parts?

A: Both parts maintain ±20% inductance tolerance, ensuring equivalent performance in frequency-dependent circuits.

Q: Can I use SDR0403-8R2ML if my circuit operates at temperatures above 100°C?

A: SDR0403-8R2ML supports operation up to 125°C, making it suitable for applications requiring extended temperature range. CD43NP-8R2MC is rated to 100°C maximum.

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