API Delevan 4426-9 Equivalent & Substitute Parts

Part Overview

The API Delevan 4426-9 is a 35.5 nH unshielded wirewound inductor rated for 3 A continuous current, designed for surface mount applications in high-frequency circuits. This component is classified as Active product status with unlimited moisture sensitivity level (MSL 1). Substitute parts are identified when electrical parameters—inductance value, tolerance, current rating, frequency characteristics, and physical dimensions—align within acceptable engineering tolerances for the application.

Key Parameters

Parameter	Value
Inductance	35.5 nH
Tolerance	±5%
Current Rating	3 A
Shielding	Unshielded
Q @ Frequency	112 @ 150 MHz
Frequency - Self Resonant	1.8 GHz
Operating Temperature Range	-55°C ~ 125°C
Mounting Type	Surface Mount
Physical Dimensions	0.270" L x 0.120" W (6.86 mm x 3.05 mm)
Height - Seated (Max)	0.125" (3.18 mm)
Packaging	Tape & Reel (TR)

Substitute Part Grouping Explanation

Substitute parts for the 4426-9 are classified into two categories based on electrical and mechanical compatibility:

Direct Manufacturer Substitute (4426R-9): This API Delevan part maintains identical electrical specifications—35.5 nH inductance, ±5% tolerance, 3 A current rating, 112 Q @ 150 MHz, and 1.8 GHz self-resonant frequency. Physical dimensions and mounting type are identical. The primary distinction is RoHS compliance status (ROHS3 Compliant vs. RoHS non-compliant on the original 4426-9).

Similar Manufacturer Substitute (744914135): This Würth Elektronik WE-CAIR series part matches the core electrical parameters—35.5 nH inductance, ±5% tolerance, and 112 Q @ 150 MHz. Physical dimensions and mounting type are identical. Differences include higher current rating (4 A vs. 3 A), specified DC resistance (6.8 mOhm Max), lower self-resonant frequency (1.5 GHz vs. 1.8 GHz), narrower operating temperature range (-40°C ~ 125°C vs. -55°C ~ 125°C), and AEC-Q200 automotive qualification.

Parameter Comparison

Parameter	4426-9 (Main)	4426R-9 (Direct Substitute)	744914135 (Similar Substitute)
Manufacturer	API Delevan Inc.	API Delevan Inc.	Würth Elektronik
Inductance	35.5 nH	35.5 nH	35.5 nH
Tolerance	±5%	±5%	±5%
Current Rating (Amps)	3 A	3 A	4 A
DC Resistance (DCR)	Not specified	Not specified	6.8 mOhm Max
Q @ Frequency	112 @ 150 MHz	112 @ 150 MHz	112 @ 150 MHz
Frequency - Self Resonant	1.8 GHz	1.8 GHz	1.5 GHz
Operating Temperature	-55°C ~ 125°C	-55°C ~ 125°C	-40°C ~ 125°C
Shielding	Unshielded	Unshielded	Unshielded
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Physical Dimensions	0.270" L x 0.120" W (6.86 mm x 3.05 mm)	0.270" L x 0.120" W (6.86 mm x 3.05 mm)	0.270" L x 0.120" W (6.86 mm x 3.05 mm)
Height - Seated (Max)	0.125" (3.18 mm)	0.125" (3.18 mm)	0.125" (3.18 mm)
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Active	Active
Packaging	Tape & Reel (TR)	Tape & Reel (TR)	Tape & Reel (TR)

Engineering Selection Recommendations

For RoHS3 Compliance Requirements: The 4426R-9 is the direct substitute when regulatory compliance with ROHS3 standards is mandatory. Electrical performance is identical to the 4426-9, with no circuit redesign required.

For Automotive or AEC-Q200 Applications: The 744914135 is suitable when AEC-Q200 qualification is specified. The higher current rating (4 A) provides additional thermal margin. The specified DC resistance (6.8 mOhm Max) enables precise power loss calculations. The lower self-resonant frequency (1.5 GHz) must be evaluated against circuit operating frequencies to ensure adequate performance margin.

For Extended Low-Temperature Operation: The 4426-9 and 4426R-9 support operation to -55°C, while the 744914135 is rated to -40°C minimum. Applications requiring -55°C operation must use the API Delevan variants.

For Inventory and Lead Time: All three parts are Active status with current stock availability. Selection should prioritize compliance requirements and thermal/frequency performance margins specific to the application.

Frequently Asked Questions (FAQ)

Q: Can the 744914135 replace the 4426-9 in all applications? A: The 744914135 is electrically compatible for inductance, tolerance, and Q-factor. However, verify that the application does not require operation below -40°C (744914135 minimum) or above 1.5 GHz self-resonant frequency. The higher current rating (4 A) is not a limitation for 3 A circuits.

Q: What is the difference between 4426-9 and 4426R-9? A: Both parts are manufactured by API Delevan with identical electrical specifications and physical dimensions. The 4426R-9 is ROHS3 Compliant, while the 4426-9 is RoHS non-compliant. Select 4426R-9 for applications subject to RoHS regulations.

Q: Does the DC resistance specification on the 744914135 affect circuit performance? A: The 744914135 specifies 6.8 mOhm maximum DC resistance. The 4426-9 and 4426R-9 do not provide this specification. If DC resistance is critical to power loss calculations, the 744914135 provides a defined maximum value for design verification.

Q: Are all three parts available in the same packaging format? A: Yes. All three parts are supplied in Tape & Reel (TR) packaging with identical physical dimensions (0.270" L x 0.120" W, 0.125" height maximum), enabling direct PCB assembly compatibility.

Q: Which part should be selected for new designs? A: For new designs, the 4426R-9 is recommended as the primary choice due to ROHS3 compliance and identical performance to the 4426-9. The 744914135 is selected when AEC-Q200 qualification or specified DC resistance is required.

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