SN75971B2DLR Equivalent & Substitute Parts

Part Overview

The SN75971B2DLR is a 9/9 transceiver half RS422/RS485 interface IC in a 56-BSSOP surface mount package manufactured by Texas Instruments. This component is classified as obsolete, making identification of equivalent and substitute parts essential for ongoing system support and new design implementations. The obsolete status necessitates sourcing alternatives that maintain electrical and mechanical compatibility with existing applications.

Substiute Parts

SN75971B2DLR

Texas InstrumentsIn Stock: 1104SN75971B2DLR Datasheet

Current PartRFQ

SN75976A1DLR

Texas InstrumentsIn Stock: 2967SN75976A1DLR Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SN75971B2DLR is determined by strict equivalence across the following critical parameters:

• Protocol compatibility: RS422 and RS485 support
• Driver/Receiver configuration: 9/9 topology
• Duplex mode: Half-duplex operation
• Receiver hysteresis: 45 mV threshold
• Supply voltage range: 4.75V ~ 5.25V
• Operating temperature range: 0°C ~ 70°C
• Package type: 56-BSSOP surface mount
• Electrical and mechanical pin compatibility

The SN75976A1DLR meets all these criteria and is classified as a parametric equivalent. The primary distinction between the main part and its substitute is product status and packaging format.

Parameter Comparison

Engineering Selection Recommendations

The SN75976A1DLR is the direct substitute for the obsolete SN75971B2DLR. Both components are manufactured by Texas Instruments and maintain identical electrical specifications and mechanical compatibility. The SN75976A1DLR carries active product status, ensuring continued availability and manufacturing support. Both parts maintain ROHS3 compliance and REACH unaffected status, meeting current regulatory requirements. The SN75976A1DLR is supplied in Tape & Reel format, which is standard for production environments. Selection of the SN75976A1DLR eliminates obsolescence risk while preserving full functional and physical compatibility with existing designs.

Frequently Asked Questions (FAQ)

Q: Can the SN75976A1DLR be used as a direct replacement for the SN75971B2DLR?

A: Yes. Both components share identical electrical parameters, including RS422/RS485 protocol support, 9/9 driver/receiver configuration, 45 mV receiver hysteresis, 4.75V ~ 5.25V supply voltage range, and 0°C ~ 70°C operating temperature. Both use the 56-BSSOP surface mount package with identical pin configuration and mechanical dimensions.

Q: What is the primary difference between these two parts?

A: The SN75971B2DLR is classified as obsolete, while the SN75976A1DLR maintains active product status. The SN75976A1DLR is supplied in Tape & Reel packaging format, standard for production quantities.

Q: Are there any compliance or regulatory differences?

A: No. Both parts maintain ROHS3 compliance, REACH unaffected status, and identical Moisture Sensitivity Level (MSL) ratings of 2 (1 Year).

Q: Will PCB layout or design modifications be required?

A: No. The 56-BSSOP package dimensions, pin count, and pin assignments are identical between both parts. Direct PCB substitution is possible without layout changes.

Q: Is the SN75976A1DLR suitable for new designs?

A: Yes. The active product status and continued manufacturing support of the SN75976A1DLR make it the appropriate choice for new designs requiring RS422/RS485 half-duplex transceiver functionality.