Würth Elektronik 749010013 LAN 10/100 Pulse Transformer Equivalent & Substitute Parts

Part Overview

The Würth Elektronik 749010013 is a 350µH LAN 10/100 Base-T pulse transformer with 1:1 turns ratio, designed for surface mount applications. This part is classified as obsolete, necessitating identification of active equivalent alternatives for new designs and production continuity. Substitute parts must maintain the same electrical characteristics (350µH inductance, 1:1 turns ratio) and mechanical compatibility (surface mount, similar dimensional envelope) while meeting current RoHS and REACH compliance requirements.

Substiute Parts

749010013

Würth ElektronikIn Stock: 4951749010013 Datasheet

Current PartRFQ

7490100111B

Würth ElektronikIn Stock: 7797490100111B Datasheet

DirectRFQ

7490100111A

Würth ElektronikIn Stock: 213977490100111A Datasheet

SimilarRFQ

749013011

Würth ElektronikIn Stock: 2093749013011 Datasheet

SimilarRFQ

HX1188FNL

Pulse ElectronicsIn Stock: 16142HX1188FNL Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts are identified based on the following critical parameters that determine functional and mechanical compatibility:

Primary Substitution Criteria:

• Inductance value: 350µH (electrical requirement for LAN 10/100 Base-T operation)
• Turns ratio: 1:1 (signal transmission requirement)
• Mounting type: Surface mount (PCB assembly compatibility)
• Transformer type classification: LAN 10/100 Base-T or equivalent isolation/data interface function
• Dimensional envelope: Compatible with 0.510" L x 0.280" W footprint or smaller

Compliance Requirements:

• RoHS3 compliance (mandatory for new designs)
• REACH unaffected status
• MSL rating suitable for manufacturing processes

Substitute parts are grouped into two categories: direct electrical equivalents from Würth Elektronik (WE-LAN series) and functional equivalents from alternative manufacturers meeting the same electrical and mechanical specifications.

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation: 7490100111A

The Würth Elektronik 7490100111A is the preferred direct substitute. It maintains identical electrical specifications (350µH inductance, 1:1 turns ratio, LAN 10/100 Base-T classification) and mechanical compatibility with the obsolete 749010013. This part is active in production, ROHS3 compliant, and features improved MSL rating (1 vs. 4), reducing moisture-related handling risks. Operating temperature range extends to 105°C, providing broader thermal margin. Dimensional variation (0.500" x 0.346" vs. 0.510" x 0.280") is within typical PCB layout tolerance for LAN transformer applications.

Secondary Recommendation: 749013011

The Würth Elektronik 749013011 provides identical mechanical footprint (0.510" x 0.280") and electrical core specifications (350µH, 1:1 turns ratio). This part adds Power over Ethernet (PoE) capability, suitable for applications requiring PoE support. MSL rating of 1 and active product status support manufacturing continuity. Operating temperature range (-40°C to 85°C) is standard for LAN applications. Select this part only if PoE functionality is required or beneficial for future design flexibility.

Alternative Recommendation: HX1188FNL

The Pulse Electronics HX1188FNL functions as an isolation and data interface transformer with 1:1 transmitter and receiver configuration. This part is active, ROHS3 compliant, and features MSL 1 rating. Dimensional envelope (0.500" x 0.358") is slightly larger in width. This part is suitable for designs where encapsulated transformer modules provide additional integration benefits. Inductance specification is not provided; verify compatibility with specific circuit requirements before selection.

Not Recommended: 7490100111B

The Würth Elektronik 7490100111B lacks detailed electrical specifications (inductance and transformer type not provided). While active and RoHS compliant, insufficient parameter documentation prevents confirmation of functional equivalence to the 749010013.

Frequently Asked Questions (FAQ)

Q: Can 7490100111A directly replace 749010013 on existing PCBs?

A: The 7490100111A maintains electrical equivalence (350µH, 1:1 turns ratio, LAN 10/100 Base-T) but has different dimensions (0.500" x 0.346" vs. 0.510" x 0.280"). PCB footprint verification is required. The smaller length (0.500" vs. 0.510") and greater width (0.346" vs. 0.280") may require layout adjustment. Height difference (0.250" vs. 0.210") must be evaluated for clearance constraints.

Q: What is the significance of MSL rating differences?

A: The obsolete 749010013 has MSL 4 (72-hour moisture sensitivity), requiring controlled storage and handling. All active substitutes feature MSL 1 (unlimited moisture sensitivity), eliminating moisture-related handling restrictions and reducing manufacturing process complexity. This improvement simplifies supply chain management and reduces defect risk.

Q: Is 749013011 suitable if PoE is not required?

A: Yes. The 749013011 provides identical core specifications (350µH, 1:1 turns ratio) and mechanical footprint to the 749010013. PoE capability is an additional feature that does not interfere with standard LAN 10/100 Base-T operation. This part is a valid substitute for non-PoE applications.

Q: How does HX1188FNL differ functionally from Würth Elektronik options?

A: The HX1188FNL is an encapsulated isolation and data interface module with integrated transmitter and receiver transformers (1:1 each). This differs from discrete transformer designs. The module approach may provide additional integration benefits but requires circuit-level compatibility verification. Inductance specification is not provided; confirm suitability through detailed datasheet review.

Q: Are all substitutes RoHS3 compliant?

A: Yes. All active substitute parts (7490100111A, 7490100111B, 749013011, HX1188FNL) are RoHS3 compliant and REACH unaffected, meeting current regulatory requirements for new designs and production.

Q: What packaging options are available?

A: 7490100111A is available in Cut Tape (CT) and Digi-Reel packaging. 749013011 is supplied in Tape & Reel (TR). HX1188FNL is supplied in Tube. Packaging selection depends on production volume and assembly process requirements.