4426R-8RC Equivalent & Substitute Parts

Part Overview

The 4426R-8RC is a 28 nH unshielded wirewound inductor manufactured by API Delevan Inc., rated for 3 A maximum continuous current. This surface mount component is designed for high-frequency applications operating at 150 MHz test frequency with a self-resonant frequency of 2.6 GHz. The component is currently classified as obsolete, making identification of suitable substitute parts essential for design continuity and procurement planning. Functionally equivalent alternatives must maintain the same inductance value and core material while meeting thermal and current requirements for the intended application.

Substiute Parts

4426R-8RC

API Delevan Inc.In Stock: 11704426R-8RC Datasheet

Current PartRFQ

744914128

Würth ElektronikIn Stock: 1280744914128 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 4426R-8RC is based on the following critical electrical and mechanical parameters:

Primary Matching Criteria (Must Match):

• Inductance value: 28 nH
• Tolerance: ±5%
• Core material: Air (unshielded wirewound)
• Mounting type: Surface Mount
• Operating frequency range compatibility (150 MHz test frequency)

Secondary Compatibility Criteria (Must Meet or Exceed):

• Current rating: Minimum 3 A (substitutes may exceed this rating)
• Operating temperature range: Must cover -55°C to 125°C or be verified for intended application temperature limits
• RoHS and REACH compliance status

Dimensional Considerations:

• Footprint and height compatibility with PCB layout constraints
• Package type: Nonstandard designation (physical verification required during board-level integration)

The Würth Elektronik 744914128 qualifies as a suitable substitute based on matching inductance (28 nH), tolerance (±5%), core material (air, unshielded), and mounting type (surface mount). This substitute offers an enhanced current rating of 4 A compared to the original 3 A specification.

Parameter Comparison

Engineering Selection Recommendations

The 744914128 from Würth Elektronik is the identified substitute for the obsolete 4426R-8RC. The substitute maintains electrical equivalence through identical inductance (28 nH) and tolerance specifications (±5%), identical core construction (unshielded air-core wirewound), and identical Q factor performance at 150 MHz.

Würth Elektronik 744914128 is classified as active status, ensuring continued availability and supply chain stability. Both the original part and substitute maintain ROHS3 compliance and unlimited moisture sensitivity rating (MSL 1), permitting equivalent reliability and handling protocols.

The substitute provides improved current handling capacity at 4 A versus the original 3 A specification. Operating temperature range differs at -40°C to 125°C for the substitute compared to -55°C to 125°C for the original; compatibility determination depends on the specific low-temperature operating environment of the application.

Dimensional comparison shows minor variations in height and width specifications that must be evaluated against PCB footprint and assembly clearance constraints. The active product status of the substitute eliminates obsolescence risk for future procurement.

Frequently Asked Questions (FAQ)

Q: What makes the Würth Elektronik 744914128 equivalent to the API Delevan 4426R-8RC?

A: Both components share the critical electrical specifications: 28 nH inductance, ±5% tolerance, unshielded air-core wirewound construction, and 105 Q factor at 150 MHz test frequency. Surface mount packaging and identical mounting type enable direct functional replacement in circuits designed for 150 MHz operation.

Q: Does the higher current rating of 744914128 (4 A vs. 3 A) affect circuit operation?

A: No. The substitute's higher current rating is a parameter enhancement that maintains backward compatibility. Circuits designed for 3 A operation function identically at the enhanced 4 A rating. The inductor will not exceed its thermal characteristics when operating within the original 3 A design specification.

Q: Are there temperature range considerations when substituting these parts?

A: The substitute operates at -40°C to 125°C compared to the original's -55°C to 125°C. Substitution is appropriate for applications operating at -40°C or above. Applications requiring operation below -40°C require specific engineering evaluation of the substitute against the application's minimum operating temperature.

Q: How do the dimensional variations between these parts affect PCB layout?

A: Width varies from 0.125" to 0.120" and height from 0.120" to 0.125". These minor dimensional differences (approximately 0.005" or 0.13mm tolerances) are typically within PCB design tolerances for nonstandard packages. Physical verification against specific board footprints and assembly clearance requirements is necessary during design integration.

Q: What is the difference between the obsolete and active product status?

A: The original 4426R-8RC is obsolete, indicating discontinued manufacturing and eventual supply exhaustion. The substitute 744914128 is active, confirming current production and assured long-term availability for new designs and replenishment orders.

Q: Are there supply packaging differences?

A: The substitute is supplied in Tape & Reel (TR) packaging format. Original part packaging is listed as dash (-), indicating different handling or custom packaging. Tape & Reel format is the industry standard for high-volume surface mount assembly and is directly compatible with automated pick-and-place equipment.