CD43NP-390KC Equivalent & Substitute Parts

Part Overview

The CD43NP-390KC is a 39 µH fixed unshielded inductor manufactured by Sumida America Components Inc., designed for surface mount applications requiring moderate current handling up to 520 mA. This component operates across the industrial temperature range of -40°C to 100°C and is classified as Active product status with full RoHS3 compliance. Substitute parts are identified when equivalent electrical performance, mechanical compatibility, and environmental ratings align with application requirements, enabling procurement flexibility and supply chain continuity.

Substiute Parts

CD43NP-390KC

Sumida America Components Inc.In Stock: 793CD43NP-390KC Datasheet

Current PartRFQ

SDR0403-390KL

Bourns Inc.In Stock: 2843SDR0403-390KL Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the CD43NP-390KC is determined by strict alignment of the following critical parameters:

Electrical Equivalence: The substitute part SDR0403-390KL maintains the identical 39 µH inductance value with ±10% tolerance, ensuring circuit performance equivalence. Current rating of 590 mA exceeds the 520 mA requirement, providing operational margin. DC resistance of 590 mOhm is within acceptable range relative to the 587 mOhm maximum specification.

Mechanical Compatibility: Both parts share identical surface mount package dimensions (4.50mm × 4.00mm × 3.50mm), confirming PCB footprint and assembly compatibility without layout modification.

Environmental & Regulatory Compliance: The substitute maintains RoHS3 compliance and MSL Level 1 rating. Operating temperature range of -40°C to 125°C exceeds the -40°C to 100°C requirement, ensuring suitability across all intended operating conditions.

Shielding Configuration: Both parts are unshielded inductors, maintaining consistent EMI and coupling characteristics within the circuit design.

Parameter Comparison

Engineering Selection Recommendations

Primary Part Selection: The CD43NP-390KC remains the preferred selection when available, as it is the original design specification component with confirmed Active product status and full inventory availability (776 pcs).

Substitute Part Selection: The SDR0403-390KL (Bourns Inc.) is a qualified substitute when CD43NP-390KC availability is constrained. Selection criteria are based on:

• Identical electrical specifications (39 µH, ±10% tolerance)
• Equivalent DC resistance performance (590 mOhm vs. 587 mOhm maximum)
• Mechanical compatibility with identical package footprint and height
• Enhanced current rating (590 mA vs. 520 mA) providing operational margin
• Extended operating temperature range (-40°C to 125°C vs. -40°C to 100°C)
• Full RoHS3 and MSL Level 1 compliance matching regulatory requirements
• Active product status with substantial inventory availability (2815 pcs)

Both components are suitable for direct substitution in surface mount applications without circuit redesign or PCB layout modification.

Frequently Asked Questions (FAQ)

Q: Can SDR0403-390KL be used as a direct replacement for CD43NP-390KC without PCB modification?

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

Q: Are the electrical characteristics equivalent between these two parts?

A: Yes. Both parts provide 39 µH inductance with ±10% tolerance. DC resistance values are equivalent (587 mOhm vs. 590 mOhm maximum). The SDR0403-390KL provides higher current rating (590 mA vs. 520 mA), which is advantageous for thermal margin.

Q: Does the substitute part meet the same regulatory and compliance standards?

A: Yes. Both parts are RoHS3 compliant and carry MSL Level 1 (Unlimited) moisture sensitivity rating, meeting identical environmental and regulatory requirements.

Q: What is the difference in operating temperature range?

A: The CD43NP-390KC operates from -40°C to 100°C, while the SDR0403-390KL operates from -40°C to 125°C. The substitute part provides extended high-temperature capability, suitable for applications requiring operation above 100°C.

Q: Are there any differences in core material or construction?

A: Both inductors use ferrite core material. The SDR0403-390KL is specified as drum core wirewound construction, while the CD43NP-390KC is unshielded ferrite core. Both are unshielded configurations with equivalent EMI characteristics.

Q: Which part should be selected for new designs?

A: For new designs, either part is acceptable based on availability and supply chain considerations. Both maintain Active product status and full compliance. Verify current inventory and lead times with component suppliers for procurement planning.