SN75C1168N Equivalent & Substitute Parts

Part Overview

The SN75C1168N is a 2/2 transceiver IC with full-duplex RS422 and RS485 protocol support, manufactured by Texas Instruments in a 16-PDIP through-hole package. This component is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. The SN75C1168N remains available in inventory (4992 pcs), but active alternatives with enhanced specifications are recommended for new applications.

Substiute Parts

SN75C1168N

Texas InstrumentsIn Stock: 5019SN75C1168N Datasheet

Current PartRFQ

SN65C1168ENSR

Texas InstrumentsIn Stock: 4146SN65C1168ENSR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SN75C1168N is determined by the following critical parameters:

• Protocol Compatibility: Both main and substitute parts must support RS422 and RS485 protocols
• Transceiver Configuration: 2/2 driver/receiver count with full-duplex operation
• Electrical Specifications: Receiver hysteresis of 60 mV and supply voltage range of 4.5V ~ 5.5V
• Functional Equivalence: Identical pin configuration and signal characteristics

The SN65C1168ENSR qualifies as a manufacturer-recommended substitute because it maintains all critical electrical parameters while offering an active product status and extended operating temperature range. The primary difference is the package format: surface-mount 16-SOIC versus through-hole 16-PDIP.

Parameter Comparison

Engineering Selection Recommendations

The SN65C1168ENSR is the manufacturer-recommended substitute for the obsolete SN75C1168N. Both components maintain identical electrical specifications for RS422/RS485 transceiver operation, including receiver hysteresis, supply voltage range, and driver/receiver configuration.

Selection between these parts depends on board-level requirements:

• Through-hole applications: The SN75C1168N remains suitable for existing designs with through-hole PCB layouts, though inventory is finite due to obsolete status.
• New designs and surface-mount applications: The SN65C1168ENSR is the preferred choice, offering active product status, extended operating temperature range (-40°C ~ 85°C versus 0°C ~ 70°C), and surface-mount compatibility for modern manufacturing processes.

Both parts carry ROHS3 compliance and EAR99 classification, ensuring regulatory alignment for industrial and commercial applications.

Frequently Asked Questions (FAQ)

Q: Can the SN65C1168ENSR directly replace the SN75C1168N in existing designs?

A: Electrical substitution is valid; however, package format differs. The SN75C1168N uses through-hole 16-DIP mounting, while the SN65C1168ENSR uses surface-mount 16-SOIC. PCB redesign is required for package conversion.

Q: What are the key compatibility criteria for these parts?

A: Both parts maintain identical RS422/RS485 protocol support, 2/2 transceiver configuration, 60 mV receiver hysteresis, and 4.5V ~ 5.5V supply voltage range. These parameters ensure functional equivalence.

Q: Why is the operating temperature range different?

A: The SN65C1168ENSR extends the operating temperature range to -40°C ~ 85°C, providing broader environmental compatibility compared to the SN75C1168N (0°C ~ 70°C). This enhancement is typical of active product revisions.

Q: Are there compliance or certification differences?

A: Both parts are ROHS3 compliant, REACH unaffected, and classified as EAR99. No compliance barriers exist for substitution.

Q: What is the primary reason to substitute the SN75C1168N?

A: The SN75C1168N is obsolete. The SN65C1168ENSR provides an active, manufacturer-supported alternative with equivalent electrical performance and extended specifications suitable for current production environments.