SN75138D Equivalent & Substitute Parts

Part Overview

The SN75138D is a 4/4 half-duplex transceiver IC manufactured by Texas Instruments in a 16-SOIC surface mount package. This component is classified as obsolete, indicating it is no longer in active production. Due to its obsolete status, identifying functionally compatible substitute parts is essential for ongoing system maintenance, redesign efforts, and procurement continuity.

Substiute Parts

SN75138D

Texas InstrumentsIn Stock: 1109SN75138D Datasheet

Current PartRFQ

SN65C1167ENSR

Texas InstrumentsIn Stock: 9568SN65C1167ENSR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SN75138D is constrained by the following critical parameters:

Mandatory Compatibility Criteria:

• Surface mount package in 16-pin SOIC form factor
• Supply voltage range overlap with 4.75V ~ 5.25V
• Transceiver IC category with driver/receiver configuration
• RoHS3 compliance for regulatory alignment

Substitution Logic: The SN65C1167ENSR is identified as a manufacturer-recommended substitute. While this part differs in duplex mode (full-duplex vs. half-duplex) and driver/receiver count (2/2 vs. 4/4), it maintains compatibility through:

• Identical 16-SOIC package family (surface mount)
• Overlapping supply voltage range (4.5V ~ 5.5V encompasses the original 4.75V ~ 5.25V)
• Same manufacturer (Texas Instruments)
• Active product status ensuring long-term availability
• Equivalent RoHS3 and MSL certifications

Parameter Comparison

Engineering Selection Recommendations

For Direct Substitution: The SN65C1167ENSR is the manufacturer-recommended substitute for the obsolete SN75138D. Selection of this part is supported by:

• Active product status ensuring procurement availability and supply chain continuity
• ROHS3 compliance matching the original part's regulatory requirements
• Identical MSL rating (1 - Unlimited) for handling and storage compatibility
• Texas Instruments manufacturer support and technical documentation

Design Considerations: Applications requiring the SN75138D must evaluate functional differences between the parts. The SN65C1167ENSR operates in full-duplex mode with 2/2 driver/receiver configuration, whereas the original part is half-duplex with 4/4 configuration. Circuit redesign may be necessary to accommodate these functional differences. The extended operating temperature range (-40°C ~ 85°C) of the substitute provides broader environmental capability than the original specification (0°C ~ 70°C).

Frequently Asked Questions (FAQ)

Q: Can the SN65C1167ENSR be used as a direct pin-for-pin replacement for the SN75138D?

A: No. While both parts are 16-SOIC surface mount transceivers from Texas Instruments, they differ in functional configuration. The SN75138D is a 4/4 half-duplex transceiver, while the SN65C1167ENSR is a 2/2 full-duplex transceiver. Circuit redesign is required to accommodate these differences.

Q: Are there package compatibility issues between these parts?

A: Both parts use 16-SOIC packages, but with different body widths: SN75138D is 0.154" (3.90mm) and SN65C1167ENSR is 0.209" (5.30mm). PCB footprints must be verified for compatibility before assembly.

Q: Does the SN65C1167ENSR meet the same compliance requirements as the SN75138D?

A: Yes. Both parts are ROHS3 compliant and carry MSL rating 1 (Unlimited), ensuring equivalent regulatory and handling requirements.

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

A: The SN75138D operates at 4.75V ~ 5.25V, while the SN65C1167ENSR operates at 4.5V ~ 5.5V. The substitute's range encompasses the original specification, providing voltage compatibility in standard 5V applications.

Q: Why is the SN75138D classified as obsolete?

A: The SN75138D is no longer manufactured by Texas Instruments. The SN65C1167ENSR is the active product recommended for new designs and ongoing applications requiring transceiver functionality.