SN75138N Equivalent & Substitute Parts

Part Overview

The SN75138N is a 4/4 half-duplex transceiver IC manufactured by Texas Instruments in a 16-DIP through-hole package. This component is classified as obsolete, with 2,849 units currently in stock. The SN75138N operates within a supply voltage range of 4.75V to 5.25V and supports operating temperatures from 0°C to 70°C. Due to its obsolete status, identifying functionally compatible substitute components is essential for ongoing system maintenance, redesign efforts, and long-term supply chain planning.

Substiute Parts

SN75138N

Texas InstrumentsIn Stock: 2951SN75138N Datasheet

Current PartRFQ

SN65C1167ENSR

Texas InstrumentsIn Stock: 9568SN65C1167ENSR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute part identification for the SN75138N is based on the following critical parameters:

• Transceiver Type & Function: Both main and substitute parts must function as transceiver interface components
• Manufacturer Continuity: Texas Instruments maintains product lineage within the SN/SNx5C series
• Electrical Compatibility: Supply voltage range and operating temperature specifications must support the application requirements
• Package Compatibility: Physical form factor and pin configuration must accommodate existing PCB layouts or allow for adapter solutions
• Compliance & Certification: RoHS3 compliance and REACH status must be maintained

The SN65C1167ENSR is identified as a manufacturer-recommended substitute. While it differs in duplex mode (full vs. half), driver/receiver count (2/2 vs. 4/4), and package type (surface mount vs. through hole), it represents the active product line continuation from Texas Instruments for half-duplex transceiver applications.

Parameter Comparison

Engineering Selection Recommendations

The SN65C1167ENSR is the active product-line substitute from Texas Instruments for the obsolete SN75138N. Both components maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory continuity.

Key considerations for substitution:

• Supply Voltage: The SN65C1167ENSR operates across a wider voltage range (4.5V ~ 5.5V) compared to the SN75138N (4.75V ~ 5.25V), providing improved tolerance margins
• Operating Temperature: The substitute supports an extended temperature range (-40°C ~ 85°C) versus the original (0°C ~ 70°C), enabling deployment in broader environmental conditions
• Channel Configuration: The SN75138N provides 4/4 drivers/receivers in half-duplex mode, while the SN65C1167ENSR provides 2/2 drivers/receivers in full-duplex mode with RS422/RS485 protocol support
• Package Form Factor: Migration from through-hole 16-DIP to surface-mount 16-SOIC requires PCB redesign or adapter implementation
• Inventory Status: The SN65C1167ENSR maintains active production status with 9,508 units in stock, ensuring long-term availability

Frequently Asked Questions (FAQ)

Q: Can the SN65C1167ENSR directly replace the SN75138N without PCB modification?

A: Direct pin-for-pin replacement is not possible due to different package types (16-DIP through-hole vs. 16-SOIC surface mount). PCB redesign or a DIP-to-SOIC adapter is required.

Q: What are the functional differences between half-duplex and full-duplex operation?

A: The SN75138N operates in half-duplex mode, allowing bidirectional communication on a single channel but not simultaneously. The SN65C1167ENSR operates in full-duplex mode, enabling simultaneous bidirectional communication. Application requirements determine which mode is appropriate.

Q: Does the SN65C1167ENSR support the same protocols as the SN75138N?

A: The SN65C1167ENSR explicitly supports RS422 and RS485 protocols. The SN75138N protocol specification is not provided in the technical data. Protocol compatibility must be verified against application requirements.

Q: Are both components RoHS compliant?

A: Yes, both the SN75138N and SN65C1167ENSR are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory standards.

Q: What is the impact of the different driver/receiver counts?

A: The SN75138N provides four independent driver/receiver pairs (4/4), while the SN65C1167ENSR provides two pairs (2/2). Application designs requiring four channels must either use multiple SN65C1167ENSR devices or identify alternative components with matching channel counts.

Q: How does the extended temperature range of the substitute affect compatibility?

A: The SN65C1167ENSR's extended operating range (-40°C ~ 85°C) is a superset of the SN75138N's range (0°C ~ 70°C). Applications operating within the original temperature range will function within the substitute's specifications. Applications requiring temperatures below 0°C or above 70°C benefit from the substitute's expanded capability.