SN75ALS085DW Equivalent & Substitute Parts

Part Overview

The SN75ALS085DW is a 2/2 transceiver IC designed for AUI (Attachment Unit Interface) applications, manufactured by Texas Instruments in a 24-SOIC surface mount package. This component is classified as obsolete, indicating it is no longer in active production. Finding equivalent or substitute parts is necessary to support legacy system maintenance, design updates, or when original inventory becomes unavailable. Substitute parts must maintain functional compatibility while meeting current supply chain requirements.

Substiute Parts

SN75ALS085DW

Texas InstrumentsIn Stock: 2279SN75ALS085DW Datasheet

Current PartRFQ

SN65C1167ENSR

Texas InstrumentsIn Stock: 9568SN65C1167ENSR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SN75ALS085DW is based on the following critical parameters:

• Transceiver Configuration: Both parts maintain a 2/2 driver/receiver architecture
• Manufacturer Continuity: Texas Instruments as the original manufacturer provides the recommended substitute
• Supply Voltage Compatibility: The substitute operates within an extended voltage range (4.5V ~ 5.5V) that encompasses the original specification (4.75V ~ 5.25V)
• Surface Mount Technology: Both components use surface mount packaging for PCB integration
• Compliance Standards: Both parts are ROHS3 compliant with MSL 1 rating and REACH unaffected status
• Protocol Transition: The substitute transitions from AUI to RS422/RS485 protocols, reflecting modern interface standards while maintaining the same driver/receiver count

The SN65C1167ENSR is identified as the manufacturer-recommended substitute, offering active product status and improved availability compared to the obsolete original part.

Parameter Comparison

Engineering Selection Recommendations

The SN65C1167ENSR is the manufacturer-recommended substitute for the obsolete SN75ALS085DW. Selection of this substitute is supported by the following factors:

• Active Product Status: The substitute is in active production, ensuring long-term availability and supply chain stability
• Regulatory Compliance: Both parts maintain ROHS3 compliance and REACH unaffected status, meeting current environmental and regulatory requirements
• Electrical Compatibility: The substitute's extended voltage supply range (4.5V ~ 5.5V) and operating temperature range (-40°C ~ 85°C) provide broader operational margins than the original part
• Functional Equivalence: Both parts maintain identical 2/2 transceiver driver/receiver configuration
• Package Consideration: The substitute uses a smaller 16-SOIC package compared to the original 24-SOIC, requiring PCB layout modification

Selection of the SN65C1167ENSR requires verification of protocol compatibility with the target application, as the transition from AUI to RS422/RS485 represents a functional change beyond pin-for-pin substitution.

Frequently Asked Questions (FAQ)

Q: Can the SN65C1167ENSR be used as a direct pin-for-pin replacement for the SN75ALS085DW?

A: No. While both parts are 2/2 transceivers from Texas Instruments, they use different package sizes (24-SOIC versus 16-SOIC) and different protocols (AUI versus RS422/RS485). PCB layout modification is required, and protocol compatibility must be verified for the specific application.

Q: What is the primary reason for substituting the SN75ALS085DW?

A: The SN75ALS085DW is classified as obsolete and no longer in active production. The SN65C1167ENSR is the manufacturer-recommended substitute with active product status and improved availability.

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

A: No. Both parts are ROHS3 compliant, REACH unaffected, and carry MSL 1 (Unlimited) moisture sensitivity ratings. Compliance certifications are equivalent.

Q: How do the operating temperature ranges compare?

A: The original SN75ALS085DW operates from 0°C to 70°C, while the substitute SN65C1167ENSR operates from -40°C to 85°C. The substitute provides an extended operating range suitable for broader environmental conditions.

Q: What is the voltage supply compatibility between these parts?

A: The original part requires 4.75V to 5.25V, while the substitute accepts 4.5V to 5.5V. The substitute's wider voltage range encompasses the original specification, providing improved tolerance margins.

Q: Does the package size difference affect PCB design?

A: Yes. The SN75ALS085DW uses a 24-SOIC package (0.295" width), while the SN65C1167ENSR uses a 16-SOIC package (0.209" width). PCB footprint and layout must be updated accordingly.

Q: What protocol change occurs with this substitution?

A: The original part implements AUI (Attachment Unit Interface) protocol, while the substitute implements RS422 and RS485 protocols. Application compatibility with these protocols must be confirmed before substitution.