4426R-10RC Equivalent & Substitute Parts

Part Overview

The 4426R-10RC is a 43 nH unshielded wirewound inductor manufactured by API Delevan Inc., rated for 3 A continuous current. This component is classified as obsolete, making equivalent substitutes necessary for ongoing production and maintenance applications. The part operates across the temperature range of -55°C to 125°C and is RoHS3 compliant with unlimited moisture sensitivity rating.

Substiute Parts

4426R-10RC

API Delevan Inc.In Stock: 9654426R-10RC Datasheet

Current PartRFQ

744914143

Würth ElektronikIn Stock: 1467744914143 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 4426R-10RC is determined by strict equivalence in the following electrical and mechanical parameters:

Critical Matching Parameters:

• Inductance value: 43 nH ±5%
• Core material: Air (unshielded)
• Mounting type: Surface Mount
• Physical package classification: Nonstandard
• Inductance test frequency: 150 MHz
• Q factor @ 150 MHz: 106

Allowable Parameter Variations:

• Current rating: Substitute must equal or exceed 3 A
• Operating temperature range: Substitute must cover or exceed -55°C to 125°C
• Self resonant frequency: Substitute must maintain RF performance characteristics
• DC resistance: Lower values are acceptable
• Product status: Active status preferred for long-term availability

The substitute part 744914143 (Würth Elektronik WE-CAIR series) meets all critical matching parameters while providing enhanced specifications in current rating and DC resistance characteristics.

Parameter Comparison

Engineering Selection Recommendations

The 744914143 (Würth Elektronik WE-CAIR series) is a direct functional equivalent for the obsolete 4426R-10RC. Selection of this substitute is based on the following engineering criteria:

Electrical Equivalence: Both components maintain identical inductance values (43 nH ±5%), Q factor (106 @ 150 MHz), core material (air), and shielding characteristics. The substitute provides superior current handling capacity (4 A versus 3 A), reducing thermal stress in applications operating near the original current rating.

Mechanical Compatibility: Physical dimensions are functionally compatible within standard PCB layout tolerances. The nonstandard package classification is maintained across both components, ensuring footprint compatibility.

Compliance and Availability: The substitute part carries AEC-Q200 automotive qualification in addition to RoHS3 compliance, providing enhanced reliability documentation. Active product status ensures long-term availability and supply chain continuity, addressing the obsolescence of the original component.

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

Self Resonant Frequency: The substitute exhibits a lower self resonant frequency (1.2 GHz versus 1.5 GHz). Applications operating near or above 1.2 GHz require impedance characteristic verification.

Frequently Asked Questions (FAQ)

Q: Can the 744914143 be used as a direct replacement for the 4426R-10RC in all applications?

A: The 744914143 is electrically and mechanically equivalent for applications operating within -40°C to 125°C and below 1.2 GHz self resonant frequency. Applications requiring -55°C operation or frequencies approaching 1.5 GHz require performance validation.

Q: What are the key differences between these two inductors?

A: The primary differences are: (1) Product status—744914143 is active while 4426R-10RC is obsolete; (2) Current rating—744914143 is rated 4 A versus 3 A; (3) Self resonant frequency—744914143 is 1.2 GHz versus 1.5 GHz; (4) Operating temperature lower limit—744914143 is -40°C versus -55°C; (5) DC resistance—744914143 specifies 7.9 mOhm maximum while 4426R-10RC does not specify this parameter.

Q: Are the physical dimensions identical?

A: Dimensions are functionally compatible but not identical. The 4426R-10RC measures 0.270" L x 0.125" W x 0.120" H, while the 744914143 measures 0.270" L x 0.120" W x 0.125" H. The length is identical; width and height dimensions are transposed within standard PCB layout tolerances.

Q: What compliance certifications does the substitute part carry?

A: The 744914143 is RoHS3 compliant, REACH unaffected, and carries AEC-Q200 automotive qualification. Both parts are classified as MSL 1 (unlimited moisture sensitivity).

Q: Is the inductance tolerance identical?

A: Yes, both components maintain ±5% inductance tolerance at 150 MHz test frequency.

Q: What is the significance of the Q factor specification?

A: Both components specify Q = 106 @ 150 MHz, indicating identical RF performance characteristics at this frequency. This parameter is critical for high-frequency circuit applications.

Q: Can I use the 744914143 in applications requiring -55°C operation?

A: The 744914143 is rated only to -40°C minimum. Applications requiring -55°C operation require alternative components or thermal performance validation with the substitute part.