SN75ALS191DG4 Equivalent & Substitute Parts

Part Overview

The SN75ALS191DG4 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 Last Time Buy, indicating limited availability and the necessity to identify compatible alternatives for ongoing production and maintenance requirements. The part operates within a 4.75V to 5.25V supply voltage range and supports 0°C to 70°C operating temperatures, making it suitable for industrial and commercial applications requiring differential signaling protocols.

Substiute Parts

SN75ALS191DG4

Texas InstrumentsIn Stock: 807SN75ALS191DG4 Datasheet

Current PartRFQ

SN75ALS191D

Texas InstrumentsIn Stock: 1531SN75ALS191D Datasheet

MFR RecommendedRFQ

SN75ALS191DR

Texas InstrumentsIn Stock: 1941SN75ALS191DR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SN75ALS191DG4 is determined by strict equivalence across the following critical parameters:

• Protocol support: RS422 and RS485
• Driver/Receiver configuration: 2/0 (2 drivers, 0 receivers)
• Package type: 8-SOIC with 0.154" width (3.90mm)
• Electrical specifications: 4.75V to 5.25V supply voltage, 0°C to 70°C operating range
• Compliance: ROHS3 compliant, MSL Level 1

All identified substitute parts maintain identical electrical and mechanical specifications. Differences exist only in packaging format (Tube versus Tape & Reel) and product status (Last Time Buy versus Active).

Parameter Comparison

Engineering Selection Recommendations

Both SN75ALS191D and SN75ALS191DR are direct functional equivalents to the SN75ALS191DG4, with identical electrical and mechanical specifications. Selection between these alternatives should be based on the following criteria:

SN75ALS191D (Tube Packaging): Maintains the same Last Time Buy status as the original part. Suitable for applications where tube packaging is preferred or required by existing assembly processes. Current inventory: 1464 pieces.

SN75ALS191DR (Tape & Reel Packaging): Offers Active product status, ensuring long-term availability and supply chain continuity. Tape & Reel format is standard for high-volume automated assembly operations. Current inventory: 1900 pieces. This option is recommended for new designs or production runs requiring extended component lifecycle support.

Both parts carry identical compliance certifications (ROHS3, REACH Unaffected, EAR99, HTSUS 8542.39.0001) and MSL Level 1 rating, confirming suitability for standard handling and storage conditions.

Frequently Asked Questions (FAQ)

Q: Can SN75ALS191D and SN75ALS191DR be used interchangeably with SN75ALS191DG4?

A: Yes. All three parts are electrically and mechanically identical. They share the same 8-SOIC package dimensions, supply voltage range (4.75V–5.25V), operating temperature range (0°C–70°C), and RS422/RS485 protocol support. The only differences are packaging format and product lifecycle status.

Q: What is the difference between Tube and Tape & Reel packaging?

A: Tube packaging contains loose components suitable for manual assembly or small-batch operations. Tape & Reel packaging presents components on continuous carrier tape, optimized for automated pick-and-place assembly systems. Both formats contain identical die and electrical performance.

Q: Why is SN75ALS191DG4 marked as Last Time Buy?

A: Last Time Buy status indicates Texas Instruments has discontinued or is discontinuing this specific part number variant. Substitute parts with Active status (such as SN75ALS191DR) ensure continued availability for future production needs.

Q: Are there any compliance or certification differences between these parts?

A: No. All three parts carry identical certifications: ROHS3 Compliant, REACH Unaffected, EAR99 classification, and HTSUS code 8542.39.0001. MSL Level 1 rating applies uniformly across all variants.

Q: Which substitute should I select for new production designs?

A: SN75ALS191DR (Tape & Reel, Active status) is recommended for new designs. Active product status guarantees long-term supply availability, and Tape & Reel packaging aligns with modern manufacturing standards for automated assembly.