Equivalent & Substitute Parts for Würth Elektronik 744029220

Part Overview

The Würth Elektronik 744029220 is a 22 µH shielded drum core, wirewound inductor rated for 410 mA with a maximum DC resistance of 970mOhm. This surface mount component operates across the temperature range of -40°C to 125°C and is classified as obsolete. Due to its obsolete product status, equivalent substitute parts from active manufacturers are necessary to maintain design continuity and ensure ongoing component availability for production and repair applications.

Key Parameters

Parameter	Value
Inductance	22 µH
Inductance Tolerance	±30%
Current Rating	410 mA
DC Resistance (DCR)	970mOhm Max
Current - Saturation (Isat)	300mA
Core Material	Ferrite
Shielding	Shielded
Mounting Type	Surface Mount
Package Type	Nonstandard (2828)
Physical Dimensions	0.110" L x 0.110" W (2.80mm x 2.80mm)
Height - Seated (Max)	0.059" (1.50mm)
Operating Temperature Range	-40°C ~ 125°C
Self Resonant Frequency	25MHz
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the Würth Elektronik 744029220 is determined by the following critical parameters:

Inductance Value: 22 µH (with ±30% tolerance)
Current Rating: Minimum 410 mA required
DC Resistance (DCR): Maximum 970mOhm
Core Material: Ferrite, shielded construction
Mounting Type: Surface mount
Physical Footprint: 2.80mm x 2.80mm base dimensions
Operating Temperature: -40°C to 125°C
Compliance: ROHS3 compliant

The substitute parts identified (Bourns SRU2013-220Y and SRU2016-220Y) maintain the same inductance value, core material, shielding characteristics, and operating temperature range. Both substitutes are from active manufacturers with current product status, ensuring long-term availability and supply chain stability.

Parameter Comparison

Parameter	Würth 744029220	Bourns SRU2013-220Y	Bourns SRU2016-220Y
Inductance	22 µH	22 µH	22 µH
Inductance Tolerance	±30%	±30%	±30%
Current Rating (Amps)	410 mA	400 mA	430 mA
Current - Saturation (Isat)	300mA	350mA	370mA
DC Resistance (DCR)	970mOhm Max	880mOhm Max	990mOhm Max
Core Material	Ferrite	Ferrite	Ferrite
Shielding	Shielded	Shielded	Shielded
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Physical Dimensions	0.110" L x 0.110" W (2.80mm x 2.80mm)	0.110" L x 0.110" W (2.80mm x 2.80mm)	0.110" L x 0.110" W (2.80mm x 2.80mm)
Height - Seated (Max)	0.059" (1.50mm)	0.059" (1.50mm)	0.071" (1.80mm)
Operating Temperature Range	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C
Self Resonant Frequency	25MHz	25MHz	30MHz
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Product Status	Obsolete	Active	Active

Engineering Selection Recommendations

Bourns SRU2013-220Y: This substitute provides a current rating of 400 mA, which is 10 mA below the original specification. The DC resistance of 880mOhm is lower than the original 970mOhm maximum, and the saturation current is higher at 350mA. This part is suitable for applications where the 10 mA current margin reduction is acceptable within the circuit design parameters. The part is ROHS3 compliant with MSL 1 rating and active product status.

Bourns SRU2016-220Y: This substitute exceeds the original current rating at 430 mA and maintains a DC resistance of 990mOhm, which is within the original specification. The saturation current is 370mA, and the self-resonant frequency is 30MHz compared to the original 25MHz. The seated height is 0.071" (1.80mm) versus the original 0.059" (1.50mm), requiring PCB layout verification for clearance. This part is ROHS3 compliant with MSL 1 rating and active product status.

Both substitutes maintain full compliance with ROHS3 and REACH requirements, ensuring regulatory alignment with current environmental standards.

Frequently Asked Questions (FAQ)

Q: Can the Bourns SRU2013-220Y be used as a direct replacement for the Würth 744029220?

A: The SRU2013-220Y is functionally equivalent for most applications. The current rating is 400 mA versus the original 410 mA. If your circuit operates at or near the 410 mA specification, the 10 mA reduction must be evaluated against your design margin requirements. The inductance value, tolerance, core material, shielding, and operating temperature range are identical.

Q: What is the primary difference between the two Bourns substitutes?

A: The SRU2016-220Y provides a higher current rating (430 mA) and higher saturation current (370mA) compared to the SRU2013-220Y (400 mA and 350mA respectively). The SRU2016-220Y also has a higher self-resonant frequency (30MHz vs. 25MHz) and a greater seated height (1.80mm vs. 1.50mm). The SRU2016-220Y is the preferred choice when maximum current headroom is required.

Q: Are there any PCB layout considerations when substituting these parts?

A: The SRU2016-220Y has a maximum seated height of 0.071" (1.80mm) compared to the original 0.059" (1.50mm). PCB designs with tight vertical clearance constraints must account for this 0.012" (0.30mm) height difference. The base footprint dimensions remain identical at 2.80mm x 2.80mm.

Q: Do these substitutes maintain the same compliance certifications?

A: Both Bourns substitutes are ROHS3 compliant and REACH unaffected, matching the original part's regulatory status. Both carry MSL 1 (Unlimited) moisture sensitivity ratings, indicating no special moisture handling requirements during storage or assembly.

Q: Why is the original Würth part obsolete?

A: The Würth Elektronik 744029220 is classified as obsolete product status. The active Bourns equivalents (SRU2013-220Y and SRU2016-220Y) provide continued access to functionally equivalent 22 µH shielded drum core inductors with current manufacturer support and supply chain availability.

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