SN75158PS Equivalent & Substitute Parts

Part Overview

The SN75158PS is a 2/0 Driver RS422 interface IC manufactured by Texas Instruments in an 8-SOIC surface mount package. This component is classified as a Last Time Buy product, indicating that the original part number is being phased out and substitution planning is necessary for continued component availability and supply chain continuity. The SN75158PS operates within the 4.75V to 5.25V supply voltage range and supports operating temperatures from 0°C to 70°C. Identifying qualified equivalent parts ensures design flexibility and mitigates obsolescence risk.

Substiute Parts

SN75158PS

Texas InstrumentsIn Stock: 2404SN75158PS Datasheet

Current PartRFQ

SN75158PSR

Texas InstrumentsIn Stock: 1935SN75158PSR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SN75158PS is based on strict equivalence of the following critical parameters:

Electrical Compatibility:

• Identical supply voltage range: 4.75V ~ 5.25V
• Identical operating temperature range: 0°C ~ 70°C
• Identical driver/receiver configuration: 2/0
• Protocol compatibility: RS422 (substitute supports RS422 and RS485)

Mechanical Compatibility:

• Identical package type: 8-SOIC (0.209", 5.30mm Width)
• Identical mounting type: Surface Mount
• Identical supplier device package: 8-SO

Compliance & Quality:

• ROHS3 Compliant status maintained
• Moisture Sensitivity Level 1 (Unlimited) maintained

The substitute part SN75158PSR meets all these criteria while offering Active product status and expanded protocol support (RS422/RS485), making it a direct functional equivalent with enhanced availability.

Parameter Comparison

Engineering Selection Recommendations

SN75158PSR is the qualified substitute for SN75158PS based on the following engineering criteria:

Electrical Equivalence: All critical electrical parameters are identical, including supply voltage (4.75V ~ 5.25V), operating temperature range (0°C ~ 70°C), and driver/receiver configuration (2/0). The substitute maintains full RS422 protocol compatibility while adding RS485 support, which does not compromise RS422-only applications.

Mechanical Equivalence: Both parts utilize the 8-SOIC package with identical physical dimensions (0.209", 5.30mm Width) and surface mount mounting type, ensuring PCB layout and assembly process compatibility.

Compliance Equivalence: Both parts maintain ROHS3 Compliant status and Moisture Sensitivity Level 1 (Unlimited), meeting environmental and handling requirements.

Supply Chain Advantage: The SN75158PSR carries Active product status with 1844 units in stock, compared to the Last Time Buy status of the original part. This substitution eliminates obsolescence risk and ensures long-term component availability.

Packaging Consideration: The substitute is supplied in Tape & Reel (TR) packaging, which differs from the original bulk packaging. This packaging format is standard for high-volume manufacturing and automated assembly processes.

Frequently Asked Questions (FAQ)

Q: Can SN75158PSR be used as a direct replacement for SN75158PS in existing designs?

A: Yes. The SN75158PSR is electrically and mechanically equivalent to the SN75158PS. All critical parameters—supply voltage, operating temperature, driver/receiver count, package type, and pin configuration—are identical. The design requires no modifications for substitution.

Q: What is the difference between SN75158PS and SN75158PSR?

A: The primary differences are product status and packaging. The SN75158PS is Last Time Buy with bulk packaging, while the SN75158PSR is Active with Tape & Reel packaging. The SN75158PSR also supports both RS422 and RS485 protocols, whereas the SN75158PS supports RS422 only. For RS422-only applications, this additional protocol support does not affect functionality.

Q: Are there any pin configuration differences between these parts?

A: No. Both parts use the 8-SOIC package with identical pin assignments. The 8-SO supplier device package designation is the same for both parts.

Q: Does the Tape & Reel packaging of SN75158PSR affect compatibility?

A: No. Tape & Reel packaging is a supply format that affects manufacturing and logistics, not electrical or mechanical compatibility. The component itself is identical. Tape & Reel format is standard for automated assembly and high-volume production.

Q: Are both parts ROHS3 compliant?

A: Yes. Both SN75158PS and SN75158PSR are ROHS3 Compliant with Moisture Sensitivity Level 1 (Unlimited), meeting environmental and handling standards.

Q: Why is SN75158PS marked as Last Time Buy?

A: Last Time Buy status indicates that the manufacturer is discontinuing this specific part number. Substitution to SN75158PSR ensures continued availability and eliminates the risk of supply interruption.

Q: Can SN75158PSR handle RS485 applications if my design only requires RS422?

A: Yes. The SN75158PSR supports both RS422 and RS485 protocols. In RS422-only applications, the additional RS485 capability does not affect performance or require design changes.