SN75ALS174APWR Equivalent & Substitute Parts

Part Overview

The SN75ALS174APWR is a 4/0 Driver RS422/RS485 interface IC manufactured by Texas Instruments in a 20-TSSOP surface mount package. This component is classified as Obsolete, indicating that Texas Instruments has discontinued active production and support. Due to its obsolete status, sourcing new original inventory may become increasingly difficult. Identifying compatible substitute parts ensures design continuity and supply chain reliability for applications requiring RS422/RS485 driver functionality.

Substiute Parts

SN75ALS174APWR

Texas InstrumentsIn Stock: 992SN75ALS174APWR Datasheet

Current PartRFQ

SN75ALS174ADWR

Texas InstrumentsIn Stock: 1977SN75ALS174ADWR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SN75ALS174APWR is determined by the following critical parameters that must remain constant:

• Base Product Number: 75ALS174
• Protocol Support: RS422, RS485
• Driver/Receiver Configuration: 4/0
• Supply Voltage Range: 4.75V ~ 5.25V
• Operating Temperature Range: 0°C ~ 70°C
• Mounting Type: Surface Mount
• RoHS Compliance: ROHS3 Compliant

The SN75ALS174ADWR qualifies as a direct functional substitute because it maintains identical electrical specifications and protocol support. The primary difference is the package format: the substitute uses 20-SOIC instead of 20-TSSOP. Both packages are surface mount configurations with equivalent pin counts and electrical performance. The substitute part is currently Active in production status, providing improved supply chain availability.

Parameter Comparison

Engineering Selection Recommendations

The SN75ALS174ADWR is the recommended substitute for the obsolete SN75ALS174APWR based on the following factors:

Electrical Equivalence: Both parts share identical supply voltage specifications (4.75V ~ 5.25V), operating temperature range (0°C ~ 70°C), and protocol support (RS422/RS485). The 4/0 driver/receiver configuration is maintained across both parts.

Product Status: The SN75ALS174ADWR maintains Active production status with Texas Instruments, ensuring continued availability and supply chain stability. The original part's Obsolete classification creates long-term sourcing risk.

Compliance Alignment: Both parts maintain ROHS3 compliance and MSL Level 1 (Unlimited) moisture sensitivity ratings, ensuring equivalent environmental and regulatory compliance.

Package Consideration: The substitute employs a 20-SOIC package (0.295", 7.50mm Width) compared to the original 20-TSSOP package (0.173", 4.40mm Width). PCB layout modifications are required to accommodate the larger SOIC footprint. Pin-to-pin electrical functionality remains identical.

Frequently Asked Questions (FAQ)

Q: Can the SN75ALS174ADWR be used as a direct replacement for the SN75ALS174APWR?

A: Yes, from an electrical and functional standpoint. Both parts provide identical RS422/RS485 driver functionality with matching supply voltage and operating temperature specifications. PCB layout changes are necessary due to package size differences (TSSOP vs. SOIC).

Q: What is the primary difference between these two parts?

A: The main difference is the package format. The SN75ALS174APWR uses a 20-TSSOP package (0.173" width), while the SN75ALS174ADWR uses a 20-SOIC package (0.295" width). Both are surface mount packages with identical pin counts and electrical performance.

Q: Why is the original part listed as Obsolete?

A: Texas Instruments has discontinued active production of the SN75ALS174APWR. The substitute SN75ALS174ADWR remains in active production, providing improved long-term availability.

Q: Are there any compliance differences between the two parts?

A: No. Both parts maintain ROHS3 compliance, MSL Level 1 (Unlimited) moisture sensitivity rating, and identical REACH and ECCN classifications.

Q: What design considerations are necessary when switching to the substitute part?

A: PCB layout redesign is required to accommodate the larger SOIC package footprint. Trace routing and component placement must be adjusted accordingly. Electrical schematic connections remain unchanged.