4426-5RC Fixed Inductor Equivalent & Substitute Parts

Part Overview

The 4426-5RC is an 18.5 nH unshielded wirewound surface mount inductor manufactured by API Delevan Inc., rated for 3 A continuous current. This component is classified as obsolete, making identification of equivalent and substitute parts essential for ongoing design support and production continuity. The part operates across a temperature range of -55°C to 125°C and demonstrates a Q factor of 132 at 150 MHz with a self-resonant frequency of 3 GHz.

Due to its obsolete status, sourcing alternatives with matching electrical and mechanical specifications is necessary for new production runs and design revisions.

Substiute Parts

4426-5RC

API Delevan Inc.In Stock: 9864426-5RC Datasheet

Current PartRFQ

744913118

Würth ElektronikIn Stock: 7147744913118 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 4426-5RC is determined by strict alignment of the following critical parameters:

Electrical Equivalence Criteria:

• Inductance value: 18.5 nH ±5% tolerance
• Core material: Air (unshielded wirewound construction)
• Q factor @ 150 MHz: 132
• Inductance test frequency: 150 MHz

Mechanical Compatibility Criteria:

• Mounting type: Surface Mount
• Physical footprint: 3.68 mm L × 3.05 mm W × 3.18 mm H (maximum seated height)
• Package classification: Nonstandard

Current Rating Consideration: The 4426-5RC is rated for 3 A continuous current. Substitute parts with equal or higher current ratings maintain full compatibility. Parts with lower current ratings do not qualify as substitutes.

The Würth Elektronik 744913118 meets all electrical and mechanical equivalence criteria while providing enhanced current capacity (4 A) and specified DC resistance (3.9 mOhm maximum).

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: Würth Elektronik 744913118

The 744913118 is the qualified substitute for the obsolete 4426-5RC based on the following engineering factors:

Electrical Performance: Identical inductance (18.5 nH), tolerance (±5%), and Q factor (132 @ 150 MHz) ensure direct functional equivalence in RF and high-frequency applications.

Current Capacity: The 4 A rating exceeds the original 3 A specification, providing design margin and thermal headroom without performance degradation.

Mechanical Fit: Identical physical dimensions (3.68 × 3.05 × 3.18 mm) and surface mount packaging enable direct PCB layout compatibility without redesign.

Compliance Status: The 744913118 carries AEC-Q200 automotive qualification and ROHS3 compliance, providing superior regulatory standing compared to the non-compliant 4426-5RC. Both parts are REACH unaffected and classified as EAR99.

Availability: The 744913118 is in active production with substantial inventory (7040 pcs), ensuring long-term supply security versus the obsolete 4426-5RC.

Temperature Consideration: The substitute operates across -40 to 125°C. Applications requiring the full -55°C lower limit of the original part require thermal performance verification.

Frequently Asked Questions (FAQ)

Q: Can the 744913118 directly replace the 4426-5RC without PCB modification?

A: Yes. Both parts share identical physical dimensions (3.68 × 3.05 × 3.18 mm) and surface mount packaging, enabling direct footprint compatibility. No PCB layout changes are required.

Q: Does the higher 4 A current rating of the 744913118 affect circuit performance?

A: No. Higher current rating indicates greater thermal capacity and lower saturation risk. The part operates identically at the original 3 A design current. This provides design margin without performance change.

Q: What is the significance of the different self-resonant frequencies (3 GHz vs. 2.5 GHz)?

A: Both frequencies exceed typical RF operating ranges for 18.5 nH inductors. The 2.5 GHz self-resonant frequency of the 744913118 remains suitable for applications up to approximately 800 MHz. Applications operating above 1 GHz require verification that the lower SRF does not introduce unintended resonance effects.

Q: Is the unspecified DC resistance of the 4426-5RC a concern when switching to the 744913118?

A: The 744913118 specifies 3.9 mOhm maximum DC resistance. This low value is typical for air-core wirewound inductors of this class and introduces negligible power loss in most applications. If the original design required specific DCR characteristics, the 3.9 mOhm specification of the substitute should be verified against circuit requirements.

Q: Does the narrower operating temperature range (-40 to 125°C vs. -55 to 125°C) limit the substitute?

A: The 744913118 operates across -40 to 125°C. Applications requiring operation below -40°C cannot use this substitute. Designs operating within -40 to 125°C experience no limitation.

Q: Are there packaging differences between the two parts?

A: The 4426-5RC is supplied as loose components. The 744913118 is supplied in Tape & Reel (TR) format, standard for high-volume production. Both use identical nonstandard surface mount packages with matching footprints.

Q: What compliance certifications does the 744913118 carry?

A: The 744913118 is AEC-Q200 qualified (automotive grade), ROHS3 compliant, and REACH unaffected. The 4426-5RC is RoHS non-compliant. The substitute provides superior regulatory compliance for new designs.