Würth Elektronik 7490200136 LAN Transformer Equivalent & Substitute Parts

Part Overview

The Würth Elektronik 7490200136 is a 350µH LAN 10/100/1000 Base-T Power over Ethernet (PoE) Pulse Transformer with 1:1 turns ratio, designed for surface mount applications. This component is classified as obsolete, necessitating identification of active equivalent parts to maintain design continuity and ensure long-term component availability for new production runs and field replacements.

Substiute Parts

7490200136

Würth ElektronikIn Stock: 19887490200136 Datasheet

Current PartRFQ

749020010A

Würth ElektronikIn Stock: 4800749020010A Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 7490200136 is determined by strict equivalence across the following critical parameters:

• Transformer Type: LAN 10/100/1000 Base-T functionality
• Inductance: 350µH
• Turns Ratio: 1:1
• Mounting Type: Surface Mount
• Packaging Format: Cut Tape (CT) & Digi-Reel®
• Compliance Standards: ROHS3 Compliant, REACH Unaffected

The substitute part 749020010A meets all substitution criteria. While the PoE designation is not explicitly stated in the substitute part description, the transformer type, inductance value, turns ratio, and mounting specifications are identical, establishing functional equivalence for LAN 10/100/1000 Base-T applications.

Parameter Comparison

Engineering Selection Recommendations

The 749020010A is the direct active substitute for the obsolete 7490200136. Both components are manufactured by Würth Elektronik within the WE-LAN series and share identical electrical specifications: 350µH inductance and 1:1 turns ratio for LAN 10/100/1000 Base-T applications.

The substitute part offers an extended operating temperature range (-40°C to 85°C versus 0°C to 70°C), providing greater thermal margin for demanding environments. Physical dimensions are within acceptable tolerance for PCB layout compatibility, with maximum height difference of 0.006" (0.16mm). Both parts maintain ROHS3 compliance and unlimited moisture sensitivity classification, ensuring regulatory and environmental consistency.

The transition from obsolete to active product status ensures long-term supply chain viability and continued manufacturer support for the 749020010A.

Frequently Asked Questions (FAQ)

Q: Can the 749020010A directly replace the 7490200136 in existing designs?

A: Yes. Both transformers share identical inductance (350µH), turns ratio (1:1), transformer type (LAN 10/100/1000 Base-T), and mounting specifications (surface mount). Physical dimensions are within acceptable PCB layout tolerance.

Q: What is the significance of the extended operating temperature range in the substitute part?

A: The 749020010A operates from -40°C to 85°C compared to the main part's 0°C to 70°C range. This provides additional thermal headroom for applications in temperature-sensitive environments, though both parts are suitable for standard industrial operating conditions.

Q: Are there any compliance differences between the two parts?

A: No. Both the 7490200136 and 749020010A are ROHS3 compliant, REACH unaffected, and classified as MSL 1 (unlimited moisture sensitivity). Regulatory and environmental compliance is equivalent.

Q: Why is the main part listed as obsolete?

A: The 7490200136 has reached end-of-life status. The 749020010A is the active equivalent maintained by Würth Elektronik for continued production and support.

Q: Are the packaging options identical?

A: Yes. Both parts are available in Cut Tape (CT) and Digi-Reel® packaging formats, ensuring compatibility with standard component procurement and assembly processes.