78Q2133S/F Equivalent & Substitute Parts

Part Overview

The 78Q2133S/F is a full-duplex Ethernet transceiver manufactured by Analog Devices Inc./Maxim Integrated, housed in a 32-TQFN (5x5) surface mount package. This component functions as a 1/1 transceiver for Ethernet interface applications and operates at 3.3V supply voltage across the temperature range of -40°C to 85°C. The part is designated as "Not For New Designs," indicating it has reached end-of-life status. Identifying equivalent substitute parts is necessary for ongoing system support, legacy design maintenance, and ensuring continued availability for production requirements.

Substiute Parts

78Q2133S/F

Analog Devices Inc./Maxim IntegratedIn Stock: 106478Q2133S/F Datasheet

Current PartRFQ

LAN8820I-ABZJ

Microchip TechnologyIn Stock: 5015LAN8820I-ABZJ Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 78Q2133S/F is based on the following critical parameters that define functional equivalence:

• Protocol Compatibility: Both main and substitute parts must support Ethernet protocol
• Transceiver Configuration: 1/1 driver/receiver architecture with full-duplex operation
• Operating Temperature Range: Minimum -40°C to 85°C coverage
• Surface Mount Technology: Both parts utilize surface mount packaging
• Regulatory Compliance: ROHS3 compliance and REACH unaffected status maintained

The LAN8820I-ABZJ from Microchip Technology meets these core functional requirements. While the substitute part features a different package format (56-QFN versus 32-TQFN) and supply voltage specification (1.14V ~ 1.26V versus 3.3V), it maintains the essential Ethernet transceiver functionality, full-duplex operation, and identical driver/receiver configuration. The substitute part carries Active product status, ensuring long-term availability and support.

Parameter Comparison

Engineering Selection Recommendations

The LAN8820I-ABZJ is the designated manufacturer-recommended substitute for the 78Q2133S/F. Selection of this substitute part is supported by the following factors:

• Product Status Alignment: The substitute part maintains Active product status, ensuring continued manufacturing support and availability, whereas the original part is designated Not For New Designs
• Regulatory Compliance: Both parts maintain ROHS3 compliance and REACH unaffected status, satisfying environmental and regulatory requirements
• Functional Equivalence: Identical Ethernet transceiver configuration, 1/1 driver/receiver architecture, full-duplex operation, and matching operating temperature range
• Supply Chain Continuity: The substitute part is currently in stock with 4,963 units available, compared to the original part's end-of-life status

Design integration requires evaluation of package footprint differences (32-TQFN to 56-QFN) and supply voltage specifications (3.3V to 1.14V ~ 1.26V) at the circuit board and power distribution levels.

Frequently Asked Questions (FAQ)

Q: What are the primary differences between the 78Q2133S/F and LAN8820I-ABZJ?

A: The substitute part differs in package format (56-QFN versus 32-TQFN), supply voltage specification (1.14V ~ 1.26V versus 3.3V), and product status (Active versus Not For New Designs). Both parts maintain identical Ethernet transceiver functionality, full-duplex operation, and 1/1 driver/receiver configuration.

Q: Can the LAN8820I-ABZJ be used as a direct pin-for-pin replacement?

A: No. The package formats differ significantly (56-QFN 8x8 versus 32-TQFN 5x5), requiring PCB layout modifications and potential schematic adjustments for supply voltage management.

Q: Are there compliance or certification concerns with substitution?

A: Both parts maintain ROHS3 compliance and REACH unaffected status. The substitute part carries MSL 3 (168 Hours) versus MSL 1 (Unlimited) for the original part, requiring appropriate moisture control during storage and handling.

Q: Why is the original part designated "Not For New Designs"?

A: This designation indicates the part has reached end-of-life status. The manufacturer recommends the LAN8820I-ABZJ for new designs and ongoing production support.

Q: What is the impact of the supply voltage difference?

A: The substitute part operates at 1.14V ~ 1.26V versus the original 3.3V specification. Power supply circuits and voltage regulation must be evaluated and potentially redesigned to accommodate this lower voltage requirement.