SN75ALS191DRG4 Equivalent & Substitute Parts

Part Overview

The SN75ALS191DRG4 is a 2/0 Driver RS422/RS485 interface IC manufactured by Texas Instruments in an 8-SOIC surface mount package. This component is classified as discontinued at DiGi Electronics, making substitute parts necessary for ongoing production and maintenance applications. The part operates within a 4.75V to 5.25V supply voltage range and supports 0°C to 70°C operating temperatures. Due to its discontinued status, identifying compatible active alternatives is essential for design continuity and component sourcing.

Substiute Parts

SN75ALS191DRG4

Texas InstrumentsIn Stock: 845SN75ALS191DRG4 Datasheet

Current PartRFQ

SN75ALS191DR

Texas InstrumentsIn Stock: 1941SN75ALS191DR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the SN75ALS191DRG4 is determined by strict equivalence across the following critical parameters:

• Protocol Compatibility: Both main and substitute parts must support RS422 and RS485 protocols
• Driver/Receiver Configuration: 2/0 driver configuration must be maintained
• Electrical Specifications: Supply voltage range (4.75V ~ 5.25V) and operating temperature range (0°C ~ 70°C) must be identical
• Package Compatibility: 8-SOIC surface mount package with 0.154" (3.90mm) width is required for PCB layout compatibility
• Regulatory Compliance: RoHS3 compliance and MSL rating must be maintained

The SN75ALS191DR qualifies as a direct substitute based on these parameters. The primary distinction is packaging format: the substitute is supplied in Tape & Reel (TR) format rather than the original DRG4 format, and it maintains active product status.

Parameter Comparison

Engineering Selection Recommendations

The SN75ALS191DR is the direct substitute for the SN75ALS191DRG4. Both parts share identical electrical and mechanical specifications, including protocol support, driver configuration, supply voltage range, operating temperature range, and package dimensions. The substitute maintains ROHS3 compliance and MSL rating equivalence.

The primary advantage of the SN75ALS191DR is its active product status, ensuring ongoing availability and supply chain continuity. The packaging format difference (Tape & Reel versus standard) does not affect component functionality or PCB integration, only procurement and handling logistics.

Frequently Asked Questions (FAQ)

Q: Can the SN75ALS191DR be used as a direct replacement for the SN75ALS191DRG4?

A: Yes. Both parts are electrically and mechanically equivalent. They share identical protocol support (RS422/RS485), driver configuration (2/0), supply voltage range (4.75V ~ 5.25V), operating temperature range (0°C ~ 70°C), and 8-SOIC package dimensions. The only difference is packaging format and product status.

Q: What does the packaging format difference mean?

A: The SN75ALS191DRG4 uses standard packaging, while the SN75ALS191DR is supplied in Tape & Reel (TR) format. This affects procurement and handling but does not impact electrical performance or PCB assembly compatibility.

Q: Are there any compliance differences between these parts?

A: No. Both parts maintain ROHS3 compliance, MSL rating of 1 (Unlimited), and identical regulatory status. They are fully equivalent from a compliance perspective.

Q: Why is the SN75ALS191DRG4 discontinued?

A: The original part is discontinued at DiGi Electronics. The SN75ALS191DR remains in active production and is the recommended source for new designs and ongoing component requirements.

Q: Will the SN75ALS191DR work in existing PCB designs using the SN75ALS191DRG4?

A: Yes. The identical 8-SOIC package dimensions and pin configuration ensure direct PCB compatibility without layout modifications.