SN75ALS197D Equivalent & Substitute Parts

Part Overview

The SN75ALS197D is a 0/4 Receiver interface IC manufactured by Texas Instruments in a 16-SOIC surface mount package. This component is classified as Last Time Buy, indicating limited future availability. The SN75ALS197D operates within a 4.75V to 5.25V supply voltage range and maintains a 120 mV receiver hysteresis specification across an operating temperature range of 0°C to 70°C. Identifying equivalent and substitute parts is essential for design continuity, inventory management, and long-term product support as this part approaches end-of-life status.

Substiute Parts

SN75ALS197D

Texas InstrumentsIn Stock: 2169SN75ALS197D Datasheet

Current PartRFQ

SN75ALS197DR

Texas InstrumentsIn Stock: 25345SN75ALS197DR Datasheet

MFR RecommendedRFQ

AM26LS33ACD

Texas InstrumentsIn Stock: 3369AM26LS33ACD Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SN75ALS197D is determined by strict alignment of the following critical parameters:

• Functional Classification: Receiver interface IC with 0/4 driver/receiver configuration
• Package Compatibility: 16-SOIC surface mount package with identical 0.154" (3.90mm) width
• Electrical Specifications: Supply voltage range 4.75V to 5.25V; operating temperature 0°C to 70°C
• Receiver Hysteresis: 120 mV specification (or compatible alternative within acceptable tolerance)
• Compliance Standards: ROHS3 compliance; MSL Level 1; REACH Unaffected status

Two substitute parts meet these criteria with documented compatibility:

1. SN75ALS197DR (Texas Instruments) – Identical electrical and mechanical specifications; differs only in packaging format (Tape & Reel vs. Tube); Active product status
2. AM26LS33ACD (Texas Instruments) – Functionally equivalent 0/4 Receiver in 16-SOIC package; receiver hysteresis 50 mV (lower than primary part); Last Time Buy status

Parameter Comparison

Engineering Selection Recommendations

SN75ALS197DR is the primary substitute for SN75ALS197D. Both parts are manufactured by Texas Instruments with identical electrical and mechanical specifications, including 120 mV receiver hysteresis, 16-SOIC package geometry, and full compliance certifications. The SN75ALS197DR differs only in packaging format (Tape & Reel vs. Tube) and maintains Active product status, ensuring continued availability and manufacturing support. This part is suitable for direct replacement in all applications where the SN75ALS197D was originally specified.

AM26LS33ACD is an alternative substitute with functional equivalence in receiver configuration and package form factor. This part maintains identical supply voltage range, operating temperature, and compliance standards. The primary distinction is a reduced receiver hysteresis specification of 50 mV compared to the 120 mV of the primary part. Selection of AM26LS33ACD requires circuit-level analysis to confirm that the lower hysteresis value does not compromise signal integrity or noise margin requirements in the target application. Both the SN75ALS197D and AM26LS33ACD carry Last Time Buy status.

Frequently Asked Questions (FAQ)

Q: Can SN75ALS197DR be used as a direct replacement for SN75ALS197D?

A: Yes. SN75ALS197DR is a direct functional and mechanical equivalent. Both parts share identical electrical specifications, package geometry, and compliance certifications. The only difference is packaging format (Tape & Reel vs. Tube). SN75ALS197DR is the recommended substitute due to its Active product status and higher inventory availability.

Q: What is the significance of the receiver hysteresis difference between SN75ALS197D and AM26LS33ACD?

A: Receiver hysteresis determines the voltage differential required between rising and falling signal thresholds. The SN75ALS197D specifies 120 mV hysteresis, while AM26LS33ACD specifies 50 mV. Lower hysteresis can reduce noise immunity in applications with marginal signal-to-noise ratios. Circuit validation is required before substituting AM26LS33ACD in designs originally specified for 120 mV hysteresis.

Q: Are both substitute parts available in the same package?

A: Yes. Both SN75ALS197DR and AM26LS33ACD are available in 16-SOIC surface mount packages with identical 0.154" (3.90mm) width. Both are suitable for PCB designs that accommodate the original SN75ALS197D footprint without modification.

Q: What compliance certifications apply to these substitute parts?

A: All three parts (SN75ALS197D, SN75ALS197DR, and AM26LS33ACD) are ROHS3 compliant, carry MSL Level 1 (Unlimited moisture sensitivity), and are REACH Unaffected. All parts meet the same regulatory and environmental standards.

Q: Why is SN75ALS197D classified as Last Time Buy?

A: Last Time Buy status indicates that Texas Instruments has discontinued or will discontinue production of this part number. Customers requiring this component should transition to equivalent alternatives such as SN75ALS197DR (Active status) to ensure long-term supply chain continuity.