SN74AS157DRG4 Equivalent & Substitute Parts

Part Overview

The SN74AS157DRG4 is a 4 x 2:1 multiplexer logic integrated circuit manufactured by Texas Instruments in 16-SOIC surface mount packaging. This device is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The multiplexer function allows selection between two input signals to route to a single output, with four independent multiplexer channels integrated on a single die.

Substiute Parts

SN74AS157DRG4

Texas InstrumentsIn Stock: 979SN74AS157DRG4 Datasheet

Current PartRFQ

SN74ALS157ADR

Texas InstrumentsIn Stock: 2775SN74ALS157ADR Datasheet

Parametric EquivalentRFQ

SN74AS157D

Texas InstrumentsIn Stock: 1199SN74AS157D Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the SN74AS157DRG4 is determined by strict equivalence across the following critical parameters:

• Circuit configuration: 4 x 2:1 multiplexer topology
• Package type: 16-SOIC surface mount form factor
• Electrical specifications: 4.5V to 5.5V supply voltage, 400µA output high current, 8mA output low current
• Operating temperature range: 0°C to 70°C
• Compliance certifications: ROHS3, REACH Unaffected, EAR99

Two substitute parts meet these criteria. The first is a parametric equivalent from the 74ALS logic family, which maintains identical electrical performance while offering active product status. The second is a direct series equivalent with identical 74AS family designation, differing only in packaging configuration.

Parameter Comparison

Engineering Selection Recommendations

Both substitute parts are suitable replacements based on product status and compliance criteria.

The SN74ALS157ADR is a parametric equivalent from the 74ALS logic family with active product status. This part maintains all electrical specifications of the original SN74AS157DRG4 while offering superior availability and long-term supply assurance. The 74ALS series represents an advanced low-power variant of the 74AS family, providing equivalent performance with reduced power consumption characteristics. This part is supplied in Tape & Reel packaging.

The SN74AS157D is a direct series equivalent within the 74AS family with active product status. This part is electrically and functionally identical to the obsolete SN74AS157DRG4, differing only in packaging configuration (Tube versus Tape & Reel). This option provides the most direct substitution path for designs requiring the same logic family designation.

Both parts carry ROHS3 compliance and REACH Unaffected status, meeting modern environmental and regulatory requirements.

Frequently Asked Questions (FAQ)

Q: Can the SN74ALS157ADR replace the SN74AS157DRG4 in existing designs?

A: Yes. The SN74ALS157ADR maintains identical electrical specifications including voltage supply range (4.5V to 5.5V), output current ratings (400µA high, 8mA low), and operating temperature range (0°C to 70°C). The 16-SOIC package footprint is identical, enabling direct PCB substitution without layout modifications.

Q: What is the difference between the SN74AS157D and SN74AS157DRG4?

A: Both parts are from the 74AS logic family with identical electrical and functional specifications. The primary difference is packaging configuration: SN74AS157DRG4 is supplied in Tape & Reel format, while SN74AS157D is supplied in Tube format. The die and electrical performance are equivalent.

Q: Why is the SN74AS157DRG4 listed as obsolete?

A: Obsolete status indicates the manufacturer has discontinued production. Active substitute parts (SN74ALS157ADR and SN74AS157D) are available to support ongoing design requirements and production needs.

Q: Are all three parts ROHS3 compliant?

A: Yes. The SN74AS157DRG4, SN74ALS157ADR, and SN74AS157D are all ROHS3 compliant and REACH Unaffected, meeting current environmental and regulatory standards.

Q: Can I use these parts interchangeably in high-speed applications?

A: All three parts share identical electrical specifications for the parameters provided. Interchangeability is determined by the circuit configuration (4 x 2:1 multiplexer), package type (16-SOIC), and electrical ratings. Application-specific performance validation should be conducted based on detailed timing specifications and signal integrity requirements of your design.