SN75ALS173NS Equivalent & Substitute Parts

Part Overview

The SN75ALS173NS is a 0/4 Receiver IC for RS422, RS423, and RS485 serial communication protocols, manufactured by Texas Instruments in a 16-SOIC surface mount package. This component is classified as Last Time Buy, indicating discontinued production with limited inventory availability. Identifying equivalent substitute parts is essential for design continuity, long-term supply chain planning, and procurement of active alternatives that maintain electrical and mechanical compatibility.

Substiute Parts

SN75ALS173NS

Texas InstrumentsIn Stock: 2118SN75ALS173NS Datasheet

Current PartRFQ

SN75ALS173NSR

Texas InstrumentsIn Stock: 4218SN75ALS173NSR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SN75ALS173NS is determined by strict equivalence across the following critical parameters:

• Protocol Compatibility: RS422, RS423, RS485 support
• Receiver Configuration: 0/4 driver/receiver count
• Receiver Hysteresis: 50 mV threshold
• Supply Voltage: 4.75V ~ 5.25V operating range
• Temperature Range: 0°C ~ 70°C
• Package Specification: 16-SOIC form factor with identical pin configuration
• Electrical Characteristics: Identical functional performance

The SN75ALS173NSR qualifies as a direct substitute based on matching all electrical specifications and package requirements. The primary distinction is packaging format: the original part is supplied in Tube packaging (Last Time Buy status), while the substitute is available in Tape & Reel format with Active product status.

Parameter Comparison

Engineering Selection Recommendations

The SN75ALS173NSR is the direct functional equivalent of the SN75ALS173NS. Both parts are manufactured by Texas Instruments with identical electrical specifications, pin configuration, and package dimensions. Selection between these parts should be based on:

Product Status: The SN75ALS173NS is Last Time Buy, indicating limited availability and no future production. The SN75ALS173NSR maintains Active status with established supply chain availability.

Compliance: Both parts meet ROHS3 compliance and REACH unaffected status, ensuring regulatory alignment for current and future applications.

Packaging Consideration: The SN75ALS173NSR is supplied in Tape & Reel format, which is standard for high-volume manufacturing and automated assembly processes. The original Tube packaging is associated with the discontinued product line.

For new designs or replenishment procurement, the SN75ALS173NSR is the appropriate selection to ensure long-term supply continuity and manufacturing compatibility.

Frequently Asked Questions (FAQ)

Q: Can the SN75ALS173NSR be used as a direct replacement for the SN75ALS173NS in existing designs?

A: Yes. Both parts are electrically and mechanically identical. The 16-SOIC package, pin configuration, voltage supply range (4.75V ~ 5.25V), operating temperature range (0°C ~ 70°C), and RS422/RS423/RS485 protocol support are identical. PCB layout and schematic connections require no modification.

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

A: Tube packaging is used for lower-volume or manual assembly applications, while Tape & Reel is the standard format for automated pick-and-place manufacturing. Both contain the same component with identical electrical performance. Tape & Reel format is preferred for production environments due to compatibility with standard assembly equipment.

Q: Why is the SN75ALS173NS marked as Last Time Buy?

A: Last Time Buy status indicates that Texas Instruments has discontinued this product line. Existing inventory is available for a limited time, but no future production is planned. The SN75ALS173NSR represents the active equivalent for ongoing supply.

Q: Are there any electrical differences between these parts?

A: No. Both parts have identical receiver hysteresis (50 mV), supply voltage range (4.75V ~ 5.25V), operating temperature range (0°C ~ 70°C), and RS422/RS423/RS485 protocol support. Functional performance is equivalent.

Q: What compliance certifications apply to both parts?

A: Both the SN75ALS173NS and SN75ALS173NSR are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements for electronic components.