SN75ALS194D Equivalent & Substitute Parts

Part Overview

The SN75ALS194D is a 4/0 Driver RS422/RS485 interface IC manufactured by Texas Instruments in a 16-SOIC surface mount package. This component is classified as Last Time Buy, indicating discontinued production with limited remaining inventory. Identifying equivalent substitute parts is essential for design continuity, long-term supply chain planning, and production scheduling when original stock becomes unavailable.

Substiute Parts

SN75ALS194D

Texas InstrumentsIn Stock: 2294SN75ALS194D Datasheet

Current PartRFQ

SN75ALS194DR

Texas InstrumentsIn Stock: 3689SN75ALS194DR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SN75ALS194D is determined by strict equivalence across the following critical parameters:

• Protocol support: RS422 and RS485 compatibility
• Driver/Receiver configuration: 4/0 (4 drivers, 0 receivers)
• Electrical specifications: 4.75V ~ 5.25V supply voltage range
• Operating temperature range: 0°C ~ 70°C
• Package type: 16-SOIC surface mount form factor
• Mechanical dimensions: 0.154" width (3.90mm)
• Regulatory compliance: ROHS3 Compliant, REACH Unaffected

The substitute part SN75ALS194DR meets all these criteria and is functionally equivalent. The primary distinction is packaging format: the original part uses Tube packaging, while the substitute uses Tape & Reel (TR) format. Both are identical die implementations with identical electrical and mechanical characteristics.

Parameter Comparison

Engineering Selection Recommendations

The SN75ALS194DR is the direct functional equivalent of the SN75ALS194D. Selection between these parts should be based on the following factors:

For the SN75ALS194D (Tube packaging): Use only when existing inventory is available and project timelines permit. This part is Last Time Buy status with finite stock (2280 Pcs reported).

For the SN75ALS194DR (Tape & Reel packaging): Recommended for new designs, production restocking, and long-term supply chain requirements. This part maintains Active product status with higher available inventory (3667 Pcs reported) and ensures ongoing manufacturability.

Both parts carry identical ROHS3 compliance and REACH Unaffected status, meeting equivalent regulatory requirements. The electrical and mechanical specifications are identical, ensuring pin-for-pin and functional compatibility in 16-SOIC surface mount applications.

Frequently Asked Questions (FAQ)

Q: Are SN75ALS194D and SN75ALS194DR electrically identical?

A: Yes. Both parts use the same die, supply voltage range (4.75V ~ 5.25V), operating temperature range (0°C ~ 70°C), and RS422/RS485 protocol support with 4/0 driver/receiver configuration.

Q: What is the difference between these parts?

A: The only difference is packaging format. SN75ALS194D uses Tube packaging; SN75ALS194DR uses Tape & Reel (TR) format. Both fit the same 16-SOIC (0.154", 3.90mm Width) surface mount footprint.

Q: Can I use SN75ALS194DR as a direct replacement for SN75ALS194D?

A: Yes, for circuit design and PCB layout purposes. The parts are pin-for-pin compatible with identical mechanical dimensions. Packaging format differences affect only component handling and assembly processes, not electrical performance or board integration.

Q: Why is SN75ALS194D marked as Last Time Buy?

A: Last Time Buy status indicates Texas Instruments has discontinued this product line. The SN75ALS194DR represents the active continuation of this product family and should be used for new designs and future production.

Q: Are both parts RoHS compliant?

A: Yes. Both SN75ALS194D and SN75ALS194DR are ROHS3 Compliant and REACH Unaffected, meeting equivalent environmental and regulatory standards.

Q: Which part should I specify for a new design?

A: Specify SN75ALS194DR. This part maintains Active product status, ensuring long-term availability and supply chain stability for production and future revisions.