SN74AS157DR Equivalent & Substitute Parts

Part Overview

The SN74AS157DR is a 4 x 2:1 multiplexer logic integrated circuit manufactured by Texas Instruments in 16-SOIC surface mount packaging. This component is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing design support and production continuity. The part operates with single supply voltage and is suitable for applications requiring multiplexing of multiple independent signal paths.

Substiute Parts

SN74AS157DR

Texas InstrumentsIn Stock: 889SN74AS157DR Datasheet

Current PartRFQ

SN74ALS157ADR

Texas InstrumentsIn Stock: 2775SN74ALS157ADR Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SN74AS157DR is determined by strict equivalence across the following critical parameters:

• Multiplexer circuit configuration (4 x 2:1)
• Output current specifications (400µA high, 8mA low)
• Supply voltage range (4.5V ~ 5.5V)
• Operating temperature range (0°C ~ 70°C)
• Package and pinout compatibility (16-SOIC)
• Regulatory compliance (RoHS3, REACH Unaffected)

The SN74ALS157ADR meets all these criteria and is classified as a parametric equivalent. The primary distinction between the main part and its substitute lies in product status and series designation (74AS versus 74ALS), with the substitute offering active production status and improved availability.

Parameter Comparison

Engineering Selection Recommendations

The SN74ALS157ADR is the direct parametric equivalent for the obsolete SN74AS157DR. Both parts maintain identical electrical specifications, package geometry, and regulatory compliance status. The substitute part is manufactured by the same supplier (Texas Instruments) and carries active product status with confirmed inventory availability.

Selection of the SN74ALS157ADR is supported by:

• Full electrical parameter equivalence across all specified operating conditions
• Identical package footprint and pinout compatibility
• Maintained RoHS3 compliance and REACH unaffected status
• Active production status ensuring long-term supply chain viability
• Higher inventory levels (2686 units versus 867 units for the main part)

Frequently Asked Questions (FAQ)

Q: Can the SN74ALS157ADR be used as a direct replacement for the SN74AS157DR?

A: Yes. Both parts share identical electrical specifications, package type, and pinout. The SN74ALS157ADR is a parametric equivalent with no design modifications required.

Q: What is the difference between the 74AS and 74ALS series designations?

A: The series designation indicates the logic family. Both families meet the specified electrical parameters for this application. The 74ALS variant offers active production status.

Q: Are there any package or mounting differences between these parts?

A: No. Both parts use 16-SOIC surface mount packaging with identical dimensions (0.154", 3.90mm width) and pinout configuration.

Q: Does the substitute part meet the same regulatory requirements?

A: Yes. The SN74ALS157ADR maintains ROHS3 compliance and REACH unaffected status identical to the main part.

Q: What is the moisture sensitivity level for these parts?

A: Both parts carry MSL 1 (Unlimited), indicating no moisture sensitivity restrictions during storage or handling.