Würth Elektronik 749020111 LAN Transformer Equivalent & Substitute Parts

Part Overview

The Würth Elektronik 749020111 is a 350µH LAN 10/100/1000 Base-T Pulse Transformer with 1:1 turns ratio, designed for Surface Mount applications. This component is classified as Obsolete, making identification of functionally equivalent alternatives necessary for ongoing design support and procurement planning. The part is ROHS3 compliant and carries MSL 1 rating, indicating minimal moisture sensitivity concerns during handling and storage.

Substiute Parts

749020111

Würth ElektronikIn Stock: 1227749020111 Datasheet

Current PartRFQ

H5120NL

Pulse ElectronicsIn Stock: 2366H5120NL Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the Würth Elektronik 749020111 is based on the following critical parameters:

Primary Substitution Criteria:

• Transformer Type: LAN 10/100/1000 Base-T or equivalent Gigabit Ethernet transformer functionality
• Turns Ratio: 1:1 or 1CT:1CT (center-tap equivalent)
• Mounting Type: Surface Mount
• Physical Footprint: Compatible dimensions within manufacturing tolerances
• Compliance: ROHS3 and REACH requirements maintained
• MSL Rating: 1 (Unlimited) for consistent handling requirements

The Pulse Electronics H5120NL qualifies as a manufacturer-recommended substitute based on these parameters. Both components are Surface Mount transformers designed for Ethernet applications, maintain identical compliance certifications, and share compatible physical dimensions within acceptable tolerances for PCB layout and assembly processes.

Parameter Comparison

Engineering Selection Recommendations

The Pulse Electronics H5120NL is the manufacturer-recommended substitute for the obsolete Würth Elektronik 749020111. Selection of this alternative is supported by:

• Compliance Alignment: Both components maintain ROHS3 and REACH compliance, ensuring regulatory requirements are met in production environments.
• Physical Compatibility: Dimensional differences are minimal (length variance of 0.005", width variance of 0.011", height reduction of 0.008"), permitting direct PCB layout substitution without redesign.
• Functional Equivalence: Both transformers serve LAN/Gigabit Ethernet applications with compatible turns ratios and Surface Mount packaging.
• Active Product Status: The H5120NL is currently in active production, ensuring long-term availability and supply chain stability compared to the obsolete 749020111.
• Identical Handling Requirements: MSL 1 rating on both components eliminates moisture sensitivity concerns during component storage and assembly processes.

Frequently Asked Questions (FAQ)

Q: Can the Pulse Electronics H5120NL directly replace the Würth Elektronik 749020111 on existing PCBs?

A: Yes. The H5120NL is the manufacturer-recommended substitute with compatible Surface Mount footprint and dimensions within acceptable manufacturing tolerances. PCB layout modifications are not required.

Q: What is the significance of the turns ratio difference (1:1 versus 1CT:1CT)?

A: Both configurations provide equivalent 1:1 transformation for LAN/Gigabit Ethernet applications. The center-tap designation (1CT:1CT) on the H5120NL indicates internal center-tap connections, which is standard for modern Ethernet transformer designs and maintains functional compatibility.

Q: Are there compliance or certification differences between these parts?

A: No. Both components are ROHS3 compliant, REACH unaffected, and carry identical ECCN (EAR99) and HTSUS (8504.31.2000) classifications. Regulatory requirements are maintained with either component.

Q: Why is the Würth Elektronik 749020111 marked as Obsolete?

A: Obsolete status indicates the manufacturer has discontinued production. The Pulse Electronics H5120NL is the active alternative, ensuring continued availability for new designs and production support.

Q: Are there any height or clearance considerations when substituting?

A: The H5120NL is 0.008" shorter than the 749020111 (2.08mm versus 2.29mm seated height). This reduction provides additional PCB clearance and does not create compatibility issues in standard applications.

Q: What packaging differences exist between these parts?

A: The 749020111 is supplied in Cut Tape (CT) and Digi-Reel packaging, while the H5120NL is supplied in Tube packaging. Both are standard Surface Mount delivery formats compatible with automated assembly processes.