CD43NP-330KC Equivalent & Substitute Parts

Part Overview

The CD43NP-330KC is a 33 µH unshielded surface mount inductor manufactured by Sumida America Components Inc. This fixed inductor is designed for applications requiring 560 mA current handling capability with a maximum DC resistance of 540 mOhm. The component operates across the temperature range of -40°C to 100°C and is classified as Active product status with ROHS3 compliance. Substitute parts are identified when equivalent electrical and mechanical parameters are required due to inventory constraints, supply chain considerations, or design flexibility needs.

Key Parameters

Parameter	Value	Unit
Inductance	33	µH
Inductance Tolerance	±10%	-
Current Rating	560	mA
DC Resistance (Max)	540	mOhm
Shielding	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-330KC with the SDR0403-330KL is based on strict equivalence of the following critical parameters:

Electrical Equivalence Criteria:

Inductance value: 33 µH (identical)
Inductance tolerance: ±10% (identical)
DC resistance: 540 mOhm Max (identical)
Shielding configuration: Unshielded (identical)
Core material: Ferrite (identical)

Mechanical Equivalence Criteria:

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

Compliance Equivalence:

RoHS3 Compliant (identical)
Moisture Sensitivity Level: 1 (Unlimited) (identical)
ECCN classification: EAR99 (identical)

The SDR0403-330KL provides enhanced current handling (640 mA versus 560 mA) and extended operating temperature range (-40°C to 125°C versus -40°C to 100°C), making it suitable for applications where the CD43NP-330KC is specified.

Parameter Comparison

Parameter	CD43NP-330KC (Sumida)	SDR0403-330KL (Bourns)	Match Status
Inductance	33 µH	33 µH	Equivalent
Inductance Tolerance	±10%	±10%	Equivalent
Current Rating	560 mA	640 mA	Compatible (Higher)
DC Resistance (Max)	540 mOhm	540 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°C to 100°C	-40°C to 125°C	Compatible (Extended)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Equivalent
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	Equivalent

Engineering Selection Recommendations

The SDR0403-330KL from Bourns Inc. is a direct substitute for the CD43NP-330KC from Sumida America Components Inc. Both components maintain Active product status and full ROHS3 compliance. The substitute part meets all electrical and mechanical requirements specified for the primary component.

The SDR0403-330KL offers design margin advantages through higher current saturation rating (990 mA) and extended operating temperature capability (125°C maximum versus 100°C). These characteristics make the substitute suitable for applications where the CD43NP-330KC is specified, with no circuit redesign required.

Both components are packaged identically in Tape & Reel format with nonstandard case dimensions of 4.50 x 4.00 x 3.50 mm, ensuring direct PCB assembly compatibility.

Frequently Asked Questions (FAQ)

Q: Can the SDR0403-330KL replace the CD43NP-330KC in existing designs?

A: Yes. The SDR0403-330KL meets all electrical and mechanical specifications of the CD43NP-330KC. Identical inductance (33 µH), tolerance (±10%), DC resistance (540 mOhm Max), shielding (unshielded), and package dimensions (4.50 x 4.00 x 3.50 mm) ensure direct substitution without circuit modification.

Q: What are the key differences between these two inductors?

A: The SDR0403-330KL provides higher current rating (640 mA versus 560 mA) and extended operating temperature range (-40°C to 125°C versus -40°C to 100°C). DC resistance and inductance values remain identical.

Q: Are both components RoHS compliant?

A: Yes. Both the CD43NP-330KC and SDR0403-330KL are ROHS3 compliant with Moisture Sensitivity Level 1 (Unlimited).

Q: Do these inductors have identical physical footprints?

A: Yes. Both components have identical package dimensions of 4.50 x 4.00 x 3.50 mm (L x W x H) and are mounted as surface mount devices on Tape & Reel packaging.

Q: What is the inductance test frequency for each part?

A: The CD43NP-330KC is tested at 2.52 MHz. The SDR0403-330KL is tested at 1 kHz. Both maintain the specified 33 µH inductance value within ±10% tolerance at their respective test frequencies.

Q: Can the SDR0403-330KL be used in high-temperature applications?

A: The SDR0403-330KL operates to 125°C maximum, providing 25°C additional temperature margin compared to the CD43NP-330KC (100°C maximum). Application requirements determine suitability for specific temperature environments.

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