CD43NP-1R8MC Equivalent & Substitute Parts

Part Overview

The CD43NP-1R8MC is a 1.8 µH unshielded ferrite core inductor manufactured by Sumida America Components Inc. This surface mount component is rated for 2.33 A continuous current with a maximum DC resistance of 63.7 mOhm. The part operates across the temperature range of -40°C to 100°C and is RoHS3 compliant with MSL 1 rating. As an active product with 707 units in stock, substitute parts may be required for design flexibility, supply chain optimization, or specific application requirements where alternative electrical or mechanical characteristics provide functional equivalence.

Substiute Parts

CD43NP-1R8MC

Sumida America Components Inc.In Stock: 807CD43NP-1R8MC Datasheet

Current PartRFQ

SDR0403-1R8ML

Bourns Inc.In Stock: 10386SDR0403-1R8ML Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the CD43NP-1R8MC is determined by strict equivalence across the following critical parameters:

Inductance Value: Both the main part and substitute must maintain 1.8 µH with ±20% tolerance to ensure circuit performance within design specifications.

Current Rating: The substitute part must support the application's current requirements. The CD43NP-1R8MC is rated for 2.33 A; substitute parts with equal or higher current ratings maintain functional compatibility.

DC Resistance: Maximum DCR of 63.7 mOhm establishes the upper limit for acceptable power dissipation. Substitute parts with lower DCR values provide improved efficiency without compromising circuit function.

Core Material and Shielding: Both parts utilize ferrite core construction with unshielded configuration, ensuring electromagnetic behavior consistency.

Physical Dimensions: Identical footprint (4.50 × 4.00 × 3.50 mm) and surface mount mounting type enable direct mechanical substitution on PCB layouts.

Environmental Compliance: RoHS3 compliance and MSL 1 rating are maintained across substitute parts to satisfy regulatory and manufacturing requirements.

The SDR0403-1R8ML from Bourns Inc. meets all substitution criteria through equivalent inductance, superior current rating (2.91 A), lower DC resistance (42 mOhm), identical physical dimensions, and matching environmental certifications.

Parameter Comparison

Engineering Selection Recommendations

Primary Part (CD43NP-1R8MC): Select when Sumida supply chain preference is established or when the 2.33 A current rating is specifically matched to application requirements. Active product status with 707 units in stock ensures availability. RoHS3 compliance and MSL 1 rating satisfy standard manufacturing and environmental requirements.

Substitute Part (SDR0403-1R8ML): Select when enhanced performance characteristics are beneficial or when Bourns supply chain provides superior availability. The SDR0403-1R8ML offers measurable advantages: 2.91 A current rating provides 25% additional current capacity, 42 mOhm DCR reduces power dissipation by 34% compared to the main part, and the extended temperature range (-40 to 125°C) accommodates higher thermal environments. Identical physical dimensions and surface mount configuration enable direct PCB substitution. RoHS3 compliance and MSL 1 rating maintain regulatory equivalence. With 10,300 units in stock, supply availability is superior.

Both parts satisfy active product status and full environmental compliance requirements. Selection between them depends on application-specific current demands, thermal dissipation priorities, and supply chain logistics.

Frequently Asked Questions (FAQ)

Q: Can the SDR0403-1R8ML directly replace the CD43NP-1R8MC on existing PCBs?

A: Yes. Both inductors share identical physical dimensions (4.50 × 4.00 × 3.50 mm), nonstandard package configuration, and surface mount mounting type. No PCB layout modifications are required for mechanical substitution.

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

A: The SDR0403-1R8ML provides superior electrical performance: 2.91 A current rating versus 2.33 A (25% higher capacity), and 42 mOhm maximum DCR versus 63.7 mOhm (34% lower resistance). Both maintain identical 1.8 µH inductance with ±20% tolerance. The substitute part's lower DC resistance reduces power dissipation in the inductor itself.

Q: Are both parts compliant with current environmental standards?

A: Yes. Both the CD43NP-1R8MC and SDR0403-1R8ML are RoHS3 compliant with MSL 1 (Unlimited) moisture sensitivity level, satisfying standard manufacturing and regulatory requirements.

Q: Does the operating temperature range difference affect substitution?

A: The SDR0403-1R8ML operates to 125°C versus the CD43NP-1R8MC's 100°C maximum. This extended range in the substitute part provides additional thermal margin for high-temperature applications. For applications operating below 100°C, both parts are functionally equivalent in this parameter.

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

A: The CD43NP-1R8MC is tested at 7.96 MHz. The SDR0403-1R8ML is tested at 1 kHz. Both parts maintain the specified 1.8 µH inductance value within their respective test conditions and ±20% tolerance band.

Q: Which part should be selected for new designs?

A: For new designs, the SDR0403-1R8ML is the preferred choice due to superior current rating, lower DC resistance, extended temperature range, and higher stock availability (10,300 units). The CD43NP-1R8MC remains suitable when specific Sumida sourcing requirements or legacy design constraints apply.

Q: Are there any packaging differences between these inductors?

A: The CD43NP-1R8MC is supplied in Tape & Reel (TR) packaging. The SDR0403-1R8ML is supplied in Cut Tape (CT) & Digi-Reel® packaging. Both packaging formats are standard for surface mount component distribution and do not affect electrical or mechanical compatibility.