4426-10NC Equivalent & Substitute Parts

Part Overview

The API Delevan Inc. 4426-10NC is a 43 nH unshielded wirewound inductor rated for 3 A continuous current, designed for surface mount applications with nonstandard packaging. The component operates across the temperature range of -55°C to 125°C and is classified as Active in product status. Identifying equivalent and substitute parts is necessary to ensure design flexibility, improve supply chain resilience, and maintain manufacturing continuity when the primary component becomes unavailable.

Substiute Parts

4426-10NC

API Delevan Inc.In Stock: 9154426-10NC Datasheet

Current PartRFQ

744914143

Würth ElektronikIn Stock: 1467744914143 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 4426-10NC are identified based on strict equivalence across the following critical electrical and mechanical parameters:

Electrical Equivalence Criteria:

• Inductance value: 43 nH (matching the primary specification)
• Tolerance: ±5% (ensuring comparable accuracy)
• Q @ Frequency: 106 @ 150MHz (matching performance metrics)
• Core material: Air (determining inductance stability and frequency response)
• Shielding: Unshielded (matching electromagnetic characteristics)

Mechanical and Thermal Compatibility:

• Operating temperature range overlap (minimum -40°C or lower, maximum 125°C or higher)
• Surface mount mounting type
• Height compatibility within nonstandard package constraints

Current Rating Consideration: The substitute part (744914143) is rated for 4 A continuous current, exceeding the original 3 A rating. This represents a higher current capacity that maintains full backward compatibility with circuits designed for the 3 A specification.

Parameter Comparison

Engineering Selection Recommendations

The Würth Elektronik 744914143 serves as an active substitute for the API Delevan 4426-10NC based on electrical and thermal alignment. Key considerations for selection include:

Compliance Profile: The 744914143 holds ROHS3 compliance and AEC-Q200 automotive qualification, providing enhanced regulatory positioning for designs subject to environmental or automotive standards. The 4426-10NC is RoHS non-compliant, which may restrict its use in regulated applications.

Current Capacity: The 744914143 provides 4 A rated current versus the 3 A specification of the original part, offering improved thermal margin in current-limited circuits.

Physical Footprint: The 744914143 exhibits a longer length (0.270" vs. 0.145") while maintaining identical width and height dimensions. Board layout compatibility must be verified before substitution.

Frequency Characteristics: Both parts deliver equivalent Q factors at 150MHz. The 4426-10NC has a self-resonant frequency of 1.5GHz compared to 1.2GHz for the 744914143, a difference that may be relevant in circuits operating near the upper frequency limits.

Temperature Range: The 4426-10NC supports operation to -55°C, while the 744914143 operates from -40°C. Selection depends on application minimum temperature requirements.

Frequently Asked Questions (FAQ)

Q: Can the Würth Elektronik 744914143 directly replace the API Delevan 4426-10NC in all applications?

A: Electrical substitution is valid for circuits where the 3 A current specification is the limiting constraint. However, physical footprint differences must be evaluated. The 744914143 is approximately 85% longer, requiring PCB layout verification. Additionally, temperature range requirements below -40°C mandate retention of the original 4426-10NC.

Q: Why are there differences in self-resonant frequency between the two parts?

A: Self-resonant frequency is a physical property determined by the inductor's geometry and construction method. The 744914143's longer form factor and different winding architecture result in a lower self-resonant frequency of 1.2GHz versus 1.5GHz for the 4426-10NC. This difference is within normal manufacturing variation for wirewound air-core inductors and does not affect equivalence at the specified test frequency of 150MHz.

Q: What does the DC Resistance (DCR) specification mean, and why is it specified for one part but not the other?

A: DCR represents the resistive loss in the inductor wire at direct current, measured in milliohms. The 744914143 specifies a maximum DCR of 7.9mOhm, while the 4426-10NC does not provide this specification. Lower DCR improves efficiency in high-current applications. When substituting to the 744914143, the specified DCR ensures predictable power dissipation characteristics.

Q: Are there thermal implications when substituting to the higher-rated 4 A part?

A: The 4 A current rating of the 744914143 indicates higher thermal capacity compared to the 3 A rating of the 4426-10NC. In circuits operating below 3 A, both parts will dissipate equivalent power. The higher rating of the 744914143 provides additional thermal margin and may reduce core temperature rise under identical current conditions.

Q: Which part should be selected for new designs?

A: For new designs, the Würth Elektronik 744914143 is recommended when board space permits the longer footprint, as it provides ROHS3 compliance, AEC-Q200 qualification, and improved current capacity. The API Delevan 4426-10NC should be retained for designs with strict space constraints or minimum operating temperatures below -40°C.