LAN91C93I-MU Equivalent & Substitute Parts

Part Overview

The LAN91C93I-MU is an Ethernet Controller manufactured by Microchip Technology, designed for IEEE 802.3 10 Base-T PHY interface applications in 100-TQFP packaging. This component is classified as obsolete, making substitute part identification essential for ongoing system support and new design implementations. The controller operates across industrial temperature ranges and supports dual voltage supply configurations, making it suitable for embedded networking applications requiring legacy Ethernet connectivity.

Substiute Parts

LAN91C93I-MU

Microchip TechnologyIn Stock: 6683LAN91C93I-MU Datasheet

Current PartRFQ

TL82543GCSL4AC

IntelIn Stock: 906TL82543GCSL4AC Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LAN91C93I-MU is determined by the following critical parameters:

• Protocol Compatibility: Both main and substitute parts must support Ethernet protocol
• Functional Classification: Both must operate as Ethernet controllers
• Supply Voltage Range: Substitute must accommodate the 3.3V to 5V supply range or overlap within this specification
• Operating Temperature Range: Substitute must support the industrial temperature range of -40°C to 85°C
• Package Type: Physical form factor must be compatible with board-level integration requirements
• Regulatory Compliance: RoHS and REACH status must be evaluated for end-application requirements

The identified substitute part TL82543GCSL4AC meets the core functional requirements of Ethernet controller operation but introduces variations in packaging, voltage specifications, and compliance certifications that must be evaluated against specific application constraints.

Parameter Comparison

Engineering Selection Recommendations

Voltage Supply Compatibility: The LAN91C93I-MU supports 3.3V and 5V supplies. The TL82543GCSL4AC operates within 3V to 3.6V range, which overlaps with the 3.3V specification but does not accommodate 5V operation. Applications requiring 5V supply cannot use this substitute without additional voltage regulation circuitry.

Package Transition: The main part uses 100-TQFP packaging while the substitute employs 352-BGA technology. This represents a significant physical form factor change requiring PCB redesign and different assembly processes.

Regulatory Compliance: The LAN91C93I-MU is ROHS3 compliant, while TL82543GCSL4AC is RoHS non-compliant. Applications subject to RoHS requirements cannot adopt this substitute without compliance verification.

Product Availability: Both parts are no longer in active production. The main part is classified as obsolete, and the substitute is discontinued at DiGi Electronics. Current inventory availability should be verified through authorized distributors.

Frequently Asked Questions (FAQ)

Q: Can TL82543GCSL4AC directly replace LAN91C93I-MU in existing designs?

A: Direct replacement is not possible due to package incompatibility (100-TQFP versus 352-BGA) and voltage supply differences. PCB redesign and firmware validation are required.

Q: What is the voltage supply limitation when using TL82543GCSL4AC?

A: The substitute operates within 3V to 3.6V, which covers the 3.3V specification of the main part but excludes 5V operation. Applications designed for 5V supply require alternative solutions.

Q: Are there RoHS compliance implications when substituting these parts?

A: Yes. The main part is ROHS3 compliant while the substitute is RoHS non-compliant. Applications subject to RoHS directives cannot use this substitute without regulatory review.

Q: What are the package considerations for this substitution?

A: The main part uses 100-TQFP (14x14mm), a quad flat pack with leads. The substitute uses 352-BGA, a ball grid array. These require different PCB layouts, assembly equipment, and testing procedures.

Q: How do the operating temperature ranges compare?

A: The main part specifies -40°C to 85°C. The substitute does not provide operating temperature specifications in the available data, requiring clarification from the manufacturer before thermal environment compatibility can be confirmed.

Q: What should be verified before implementing this substitute?

A: Confirm voltage supply requirements, validate PCB layout compatibility with 352-BGA packaging, verify operating temperature specifications with Intel, assess RoHS compliance requirements, and perform functional testing with target firmware.