Würth Elektronik 744029470 Equivalent & Substitute Parts

Part Overview

The Würth Elektronik 744029470 is a 47 µH shielded drum core wirewound inductor rated for 250 mA with a maximum DC resistance of 2.5Ohm. This component is classified as obsolete, making identification of suitable substitute parts essential for ongoing design support and procurement continuity. The part operates across the industrial temperature range of -40°C to 125°C and is RoHS3 compliant.

Substiute Parts

744029470

Würth ElektronikIn Stock: 830744029470 Datasheet

Current PartRFQ

SRU2016-470Y

Bourns Inc.In Stock: 1030SRU2016-470Y Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

The Bourns Inc. SRU2016-470Y qualifies as a direct substitute based on the following alignment of critical electrical and mechanical parameters:

Matching Parameters:

• Inductance: 47 µH (identical)
• Tolerance: ±30% (identical)
• Core Material: Ferrite (identical)
• Shielding: Shielded (identical)
• Mounting Type: Surface Mount (identical)
• Physical Dimensions: 0.110" L x 0.110" W / 2.80mm x 2.80mm (identical)
• Operating Temperature Range: -40°C to 125°C (identical)
• Inductance Test Frequency: 100 kHz (identical)
• RoHS Status: ROHS3 Compliant (identical)
• MSL Rating: 1 (Unlimited) (identical)

Allowable Parameter Variations:

• Current Rating: 250 mA (main) vs. 310 mA (substitute) — substitute provides higher current capacity
• DC Resistance: 2.5Ohm Max (main) vs. 1.65Ohm Max (substitute) — substitute provides lower resistance
• Height: 0.059" / 1.50mm (main) vs. 0.071" / 1.80mm (substitute) — within acceptable mechanical tolerance for nonstandard packages
• Saturation Current: 200mA (main) vs. 220mA (substitute) — substitute provides higher saturation point

Parameter Comparison

Engineering Selection Recommendations

The Bourns Inc. SRU2016-470Y is the qualified substitute for the obsolete Würth Elektronik 744029470. Selection is based on:

• Regulatory Compliance: Both components maintain ROHS3 compliance and REACH unaffected status, ensuring continued regulatory alignment.
• Product Availability: The substitute is active in production with documented inventory, whereas the original part is obsolete.
• Electrical Performance: The substitute meets or exceeds all critical electrical specifications. The reduced DC resistance (1.65Ohm vs. 2.5Ohm) and increased current rating (310 mA vs. 250 mA) provide improved thermal performance and design margin.
• Mechanical Compatibility: Identical footprint and mounting type ensure direct PCB compatibility. The marginal height increase (0.30mm) remains within acceptable tolerances for nonstandard surface mount packages.
• Thermal Characteristics: Identical operating temperature range supports equivalent thermal design requirements.

Frequently Asked Questions (FAQ)

Q: Can the SRU2016-470Y be used as a direct replacement on existing PCBs designed for the 744029470?

A: Yes. Both components share identical footprint dimensions (2.80mm x 2.80mm), mounting type (surface mount), and electrical specifications (47 µH, ±30% tolerance). The height difference of 0.30mm (1.50mm vs. 1.80mm) is within acceptable mechanical tolerance for nonstandard packages and does not affect PCB assembly compatibility.

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

A: The primary differences are DC resistance (2.5Ohm vs. 1.65Ohm), current rating (250 mA vs. 310 mA), and saturation current (200 mA vs. 220 mA). The substitute provides superior electrical performance with lower resistance and higher current capacity. Product status differs: the original is obsolete while the substitute is active.

Q: Are there any thermal or performance implications when switching to the SRU2016-470Y?

A: The lower DC resistance of the substitute (1.65Ohm) results in reduced resistive heating compared to the original part (2.5Ohm). This represents an improvement in thermal efficiency. Both components operate across the identical temperature range (-40°C to 125°C) and maintain equivalent inductance and tolerance specifications.

Q: What packaging format is available for the SRU2016-470Y?

A: The substitute is supplied in Tape & Reel (TR) format, which is standard for high-volume surface mount assembly. The original part packaging information was not specified in available documentation.

Q: Are both components RoHS compliant?

A: Yes. Both the 744029470 and SRU2016-470Y are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements for electronic component procurement.