4426-10RC Equivalent & Substitute Parts Reference

Part Overview

The 4426-10RC is a 43 nH unshielded wirewound inductor manufactured by API Delevan Inc., rated for 3 A continuous current operation. This surface mount component is designed for high-frequency applications with a self-resonant frequency of 1.5 GHz and quality factor of 106 at 150 MHz. The part is classified as obsolete, necessitating identification of active equivalent components that maintain electrical and mechanical compatibility for ongoing production and repair applications.

Substiute Parts

4426-10RC

API Delevan Inc.In Stock: 9344426-10RC Datasheet

Current PartRFQ

744914143

Würth ElektronikIn Stock: 1467744914143 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute identification for the 4426-10RC is based on strict electrical and mechanical parameter matching within the constraints of surface mount inductor technology. The substitution logic requires:

Electrical Parameters (Non-negotiable):

• Inductance value of 43 nH with ±5% tolerance
• Unshielded wirewound construction with air core
• Current rating equal to or greater than 3 A
• Quality factor of 106 at 150 MHz test frequency
• Operating temperature range encompassing -55°C to 125°C

Mechanical Parameters (Non-negotiable):

• Surface mount package configuration
• Nonstandard package dimensions compatible with PCB layout
• Height seated maximum of 0.125" (3.18mm)

Compliance Considerations:

• RoHS and REACH compliance status
• Moisture sensitivity level 1 (unlimited shelf life)

The Würth Elektronik 744914143 qualifies as a substitute based on matching all critical electrical parameters while offering enhanced specifications in current rating (4 A versus 3 A) and active product status with AEC-Q200 automotive qualification.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: Würth Elektronik 744914143

The 744914143 is the qualified substitute for the obsolete 4426-10RC based on the following engineering criteria:

1. Electrical Equivalence: Identical inductance (43 nH), tolerance (±5%), and quality factor (106 @ 150 MHz) ensure functional compatibility in circuit operation.

2. Current Capacity: The 4 A rating of the substitute exceeds the 3 A requirement of the original part, providing operational margin without derating.

3. Product Status: Active manufacturing status and AEC-Q200 automotive qualification ensure long-term availability and reliability for production applications.

4. Compliance Enhancement: ROHS3 compliance of the substitute addresses regulatory requirements not met by the obsolete original part.

5. Thermal Compatibility: Operating temperature range of -40°C to 125°C covers the upper specification of the original part; applications requiring -55°C operation require verification.

6. Frequency Consideration: The self-resonant frequency of 1.2 GHz in the substitute is lower than the 1.5 GHz of the original. Applications operating above 1.2 GHz require circuit validation.

7. Packaging: Identical surface mount configuration and height specifications ensure PCB layout compatibility without redesign.

Frequently Asked Questions (FAQ)

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

A: The 744914143 is electrically and mechanically compatible for applications operating within -40°C to 125°C temperature range and below 1.2 GHz frequency. Applications requiring -55°C operation or frequencies above 1.2 GHz require circuit validation before substitution.

Q: What is the significance of the self-resonant frequency difference between the two parts?

A: The self-resonant frequency defines the upper frequency limit of inductor operation. The 4426-10RC operates to 1.5 GHz, while the 744914143 operates to 1.2 GHz. Applications using frequencies between 1.2 GHz and 1.5 GHz must be re-evaluated with the substitute part.

Q: Does the higher current rating of the substitute part affect circuit performance?

A: No. A higher current rating indicates greater thermal margin and lower saturation risk. The 4 A rating of the substitute accommodates the 3 A requirement with operational headroom, improving reliability without changing electrical characteristics.

Q: Are there packaging differences between these parts?

A: Both parts are surface mount with identical height (0.125" maximum seated). The 744914143 has slightly larger length and width dimensions (6.86mm x 3.05mm versus 3.68mm x 3.05mm). PCB layout verification is required to confirm footprint compatibility.

Q: What is the impact of the RoHS compliance difference?

A: The 4426-10RC is RoHS non-compliant, while the 744914143 is ROHS3 compliant. For applications subject to RoHS regulations or customer requirements, the substitute part provides regulatory alignment. For legacy systems without RoHS requirements, both parts are functionally equivalent.

Q: Is the DC resistance specification important for substitution?

A: The original part does not specify DC resistance. The substitute specifies 7.9 mOhm maximum. In high-current or low-impedance circuit applications, this resistance value should be verified against circuit design requirements to ensure acceptable power dissipation.