4426-9RC Fixed Inductor - Equivalent & Substitute Parts

Part Overview

The API Delevan Inc. 4426-9RC is a 35.5 nH unshielded wirewound surface mount inductor rated for 3 A operation. This component is classified as obsolete, necessitating identification of functionally equivalent alternatives for new designs and production applications. The inductor features an air core with ±5% inductance tolerance and operates across an extended temperature range of -55°C to 125°C, making it suitable for demanding RF and high-frequency applications where compact form factor and low inductance values are required.

Substiute Parts

4426-9RC

API Delevan Inc.In Stock: 11514426-9RC Datasheet

Current PartRFQ

744914135

Würth ElektronikIn Stock: 1578744914135 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 4426-9RC is determined by matching the following critical electrical and mechanical parameters:

Primary Matching Criteria:

• Inductance value: 35.5 nH (at 150 MHz test frequency)
• Inductance tolerance: ±5%
• Core material: Air
• Shielding configuration: Unshielded
• Current rating: minimum 3 A
• Mounting type: Surface Mount
• Physical package dimensions: 6.86 mm × 3.05 mm footprint with maximum seated height of 3.18 mm

The Würth Elektronik 744914135 meets all substitution criteria with a higher current rating of 4 A, improved DC resistance specification of 6.8 mOhm maximum, and identical inductance and tolerance values. The component maintains the same unshielded air-core wirewound construction and surface mount package configuration required for direct replacement.

Parameter Comparison

Engineering Selection Recommendations

The Würth Elektronik 744914135 is the qualified substitute for the obsolete 4426-9RC. Selection of the substitute component is based on:

Product Status: The 4426-9RC is classified as obsolete, whereas the 744914135 is an active product with confirmed ongoing availability.

Compliance and Certifications: The 744914135 carries AEC-Q200 qualification and ROHS3 compliance, providing established quality assurance for automotive and high-reliability applications. The original 4426-9RC is RoHS non-compliant.

Electrical Performance: Both components deliver identical inductance values (35.5 nH) at the specified test frequency (150 MHz) with matching ±5% tolerance. The substitute provides an increased current rating (4 A versus 3 A), expanding safe operational margins in power-critical circuits. The defined DC resistance specification (6.8 mOhm maximum) for the substitute offers predictable thermal performance.

Mechanical Compatibility: Identical physical dimensions and surface mount package configuration ensure direct PCB-level compatibility without layout modifications.

Frequently Asked Questions (FAQ)

Q: Can the 744914135 directly replace the 4426-9RC in existing designs? A: Yes. The 744914135 provides identical inductance, tolerance, and core material specifications. Footprint and mounting type are identical. The higher current rating (4 A) and lower DC resistance do not create functional incompatibilities with the original 3 A design specification.

Q: What is the impact of the different self-resonant frequencies (1.8 GHz vs 1.5 GHz)? A: The self-resonant frequency defines the frequency boundary above which the inductor exhibits capacitive behavior. The 1.5 GHz specification for the 744914135 remains well above typical RF operating frequencies for this component class and does not affect compatibility with designs originally specified for 1.8 GHz operation.

Q: Does the narrower operating temperature range of the substitute (-40°C to 125°C versus -55°C to 125°C) present a limitation? A: The substitute component operates across -40°C to 125°C, which covers standard industrial and commercial temperature requirements. Applications requiring operation below -40°C must retain the original 4426-9RC or identify alternative components with extended lower temperature bounds.

Q: How does the AEC-Q200 qualification affect component selection? A: AEC-Q200 qualification indicates the 744914135 has undergone automotive-grade reliability testing. This provides additional confidence for applications requiring established quality standards, though it does not restrict use in non-automotive applications.

Q: Are there mechanical constraints related to packaging differences? A: No. Both components use identical surface mount packages with matching footprints (6.86 mm × 3.05 mm) and maximum seated heights (3.18 mm). No PCB layout or assembly process modifications are required.